You drive a race car around a circular track of radius 300 m at a constant spe 108 km/h. Your acceleration will be: A) 39.9 m/s B) 9.8 m/s C) 3.0 m/s D) 0.36 m/s

Answer:

F = 345.45 N

Explanation:

Angular acceleration of the disc is given as rate of change in angular speed

it is given by formula

[tex]\alpha = \frac{d\omega}{dt}[/tex]

[tex]\alpha = \frac{2\pi(0.600)}{2}[/tex]

[tex]\alpha = 1.88 rad/s^2[/tex]

now we know that moment of inertia of the solid uniform disc is given as

[tex]I = \frac{1}{2}mR^2[/tex]

[tex]I = \frac{1}{2}245(1.50)^2[/tex]

[tex]I = 275.625 kg m^2[/tex]

now we have an equation for torque as

[tex]\Tau = I\alpha[/tex]

[tex]r F = 275.625(1.88)[/tex]

[tex]F = \frac{275.625(1.88)}{1.50}[/tex]

[tex]F = 345.45 N[/tex]

Answer:

Elastic potential energy, E = 2 J

Explanation:

It is given that,

Spring constant of the spring, k = 2500 N/m

The spring is stretched to a distance of 4 cm i.e. x = 0.04 m

We have to find the elastic potential energy possessed by the spring. A spring possessed elastic potential energy and it is given by:

[tex]E=\dfrac{1}{2}kx^2[/tex]

[tex]E=\dfrac{1}{2}\times 2500\ N/m\times (0.04\ m)^2[/tex]

E = 2 Joules.

Hence, the correct option is (d) " 2 Joules ".

(a) 0.165 m/s

The total initial momentum of the astronaut+capsule system is zero (assuming they are both at rest, if we use the reference frame of the capsule):

[tex]p_i = 0[/tex]

The final total momentum is instead:

[tex]p_f = m_a v_a + m_c v_c[/tex]

where

[tex]m_a = 125 kg[/tex] is the mass of the astronaut

[tex]v_a = 2.50 m/s[/tex] is the velocity of the astronaut

[tex]m_c = 1900 kg[/tex] is the mass of the capsule

[tex]v_c[/tex] is the velocity of the capsule

Since the total momentum must be conserved, we have

[tex]p_i = p_f = 0[/tex]

so

[tex]m_a v_a + m_c v_c=0[/tex]

Solving the equation for [tex]v_c[/tex], we find

[tex]v_c = - \frac{m_a v_a}{m_c}=-\frac{(125 kg)(2.50 m/s)}{1900 kg}=-0.165 m/s[/tex]

(negative direction means opposite to the astronaut)

So, the change in speed of the capsule is 0.165 m/s.

(b) 520.8 N

We can calculate the average force exerted by the capsule on the man by using the impulse theorem, which states that the product between the average force and the time of the collision is equal to the change in momentum of the astronaut:

[tex]F \Delta t = \Delta p[/tex]

The change in momentum of the astronaut is

[tex]\Delta p= m\Delta v = (125 kg)(2.50 m/s)=312.5 kg m/s[/tex]

And the duration of the push is

[tex]\Delta t = 0.600 s[/tex]

So re-arranging the equation we find the average force exerted by the capsule on the astronaut:

[tex]F=\frac{\Delta p}{\Delta t}=\frac{312.5 kg m/s}{0.600 s}=520.8 N[/tex]

And according to Newton's third law, the astronaut exerts an equal and opposite force on the capsule.

(c) 25.9 J, 390.6 J

The kinetic energy of an object is given by:

[tex]K=\frac{1}{2}mv^2[/tex]

where

m is the mass

v is the speed

For the astronaut, m = 125 kg and v = 2.50 m/s, so its kinetic energy is

[tex]K=\frac{1}{2}(125 kg)(2.50 m/s)^2=390.6 J[/tex]

For the capsule, m = 1900 kg and v = 0.165 m/s, so its kinetic energy is

[tex]K=\frac{1}{2}(1900 kg)(0.165 m/s)^2=25.9 J[/tex]

The astronaut's push off leads to a change in the speed of the space capsule of -0.164 m/s. The average force exerted is approximately 416.67N. The final kinetic energy of the astronaut and the space capsule are 156.25J and 25628.1J respectively.

This problem covers the principle of conservation of momentum. The astronaut and the space capsule constitute a closed system, where the total momentum before and after the push must be equal.

(a) Using the principle of conservation of momentum (initial momentum = final momentum), we can calculate the change in speed of the space capsule when the astronaut pushes off. We start with the equation m1V1 + m2V2 = 0, where m1 is the astronaut's mass and V1 is her speed, and m2 is the space capsule's mass and V2 is its velocity. Solving for V2 gives us a change in speed of the space capsule of -0.164m/s (which is in the opposite direction to the astronaut's motion).

(b) The average force exerted can be calculated by changing momentum over time (Force = Change in momentum / Time). Here we obtain approximately 416.67N.

(c) The final kinetic energy of each object is K = 1/2*m*v^2. For the astronaut, this is approximately 156.25J and for the space capsule, this is 25628.1J.

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Answer:

a) It takes 5.79 seconds for the grinding wheel to stop.

b) In an interval of 5.79 seconds it rotates 28.48 rad.

Explanation:

a) We have equation of motion v = u + at

  Here v = 0 rad/s, a = -1.70 rad/s², u = 94 rev/min = 9.84 rad/s

  Substituting

         0 = 9.84 - 1.70 x t

          t = 5.79 seconds.

It takes 5.79 seconds for the grinding wheel to stop.

b) We have equation of motion v² = u² + 2as

      v = 0 rad/s, a = -1.70 rad/s², u = 9.84 rad/s

  Substituting

         0² = 9.84² - 2 x 1.70 x s

          s = 28.48 rad

 So in an interval of 5.79 seconds it rotates 28.48 rad.

Answer:

r² / 110² − 3z² / 1375² = 1

Explanation:

The equation of a hyperboloid (which is a hyperbola rotated about the z axis or conjugate axis) that is centered at the origin is:

x² / a² + y² / b² − z² / c² = 1

If the cross sections are circular rather than elliptical, then a = b.

(x² + y²) / a² − z² / c² = 1

Or, if you prefer cylindrical coordinates:

r² / a² − z² / c² = 1

We know that at z = 0, r = 110.  And at z = -500, r = 130.

110² / a² − 0 = 1

130² / a² − (-500)² / c² = 1

Solving:

a² = 110²

c² = 1375² / 3

Plugging in:

r² / 110² − 3z² / 1375² = 1

a. The wheel accelerates uniformly, so its constant acceleration is equal to the average acceleration:

[tex]\alpha=\dfrac{0.20\frac{\rm rev}{\rm s}-0}{32.0\,\rm s}=0.0063\dfrac{\rm rev}{\mathrm s^2}[/tex]

b. Yes. Since

[tex]\alpha=\dfrac{\Delta\omega}{\Delta t}=\dfrac\omega{\Delta t}[/tex]

then multiplying [tex]\alpha[/tex] by 2 means we double the change in angular speed, but the wheel starts from rest so only the final angular speed [tex]\omega[/tex] gets doubled.

Final answer:

The proton's speed after 4 seconds will remain the same as its initial speed of 1.5 x 10^6 m/s.

Explanation:

To find the proton's speed 4 seconds after entering the magnetic field, we need to apply the right-hand rule. The magnetic force on a charged particle moving in a magnetic field is given by the equation F = qvBsin(θ), where F is the force, q is the charge, v is the velocity, B is the magnetic field, and θ is the angle between the velocity and the magnetic field. Since the proton's initial velocity vector makes an angle of 30° with the magnetic field, the force acting on the proton will be perpendicular to its velocity. Therefore, it will not change the proton's speed, but rather cause it to move in a circular path. As a result, the proton's speed after 4 seconds will remain the same as its initial speed of 1.5 x 10^6 m/s.

Answer:

200 revolutions per minute = 20.9 rad/s

Explanation:

It is given that, a figure skater is rotating at a rate of 200 revolutions per minute. It is the angular velocity of the skater. We have to convert it into radian/second.

Revolution per minute can be converted to radian per minute as :

Since, 1 radian/second = 60/2π revolutions per minute

So, 1 revolution/minute = 2π/60 radian/second

200 revolution/minute = 200 × 2π/60 radian/second

200 revolution/minute = 20.9 radian/second

Hence, this is the required solution.

Answer:

1.5 x 10^-8 Tesla

Explanation:

E = 4.5 V/m

The relation between electric field and the magnetic field in electromagnetic wave is given by

c = E / B

Where, c be the velocity of light in vacuum, e be the electric field and B be the magnetic field

B = E / c

B = 4.5 / ( 3 x 10^8)

B = 1.5 x 10^-8 Tesla

The magnetic field of an electromagnetic wave at a specific point can be calculated using the known electric field and the speed of light. In this case, the magnitude of the magnetic field is 1.5 x 10^-8 Tesla (T).

In the context of an electromagnetic wave, the electric and magnetic fields are linked through Maxwell's Equations. Given that an electromagnetic wave propagates in free space, the ratio of the amplitudes of the electric field (E) to the magnetic field (B) is always equal to the speed of light (c), according to the equation c = E/B. Thus, when the magnitude of the electric field (E) is known, the magnetic field (B) can be calculated as B=E/c. In this case, the Electric field (E) is 4.50 V/m. Hence, using the value of speed of light c = 3x10^8 m/sec, we calculate the magnetic field (B) as follows: B = 4.50 V/m / 3x10^8 m/sec = 1.5 x 10^-8 Tesla (T).

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Answer:

[tex]8.1^{\circ}, 171.9^{\circ}[/tex]

Explanation:

The magnitude of the magnetic force exerted on the moving electron is:

[tex]F=qvB sin \theta[/tex]

where here we have

[tex]F=1.40\cdot 10^{-16} N[/tex] is the magnitude of the force

[tex]q=1.6\cdot 10^{-19} C[/tex] is the magnitude of the electron charge

B = 1.23 T is the magnetic field intensity

[tex]\theta[/tex] is the angle between the direction of the electron's velocity and the magnetic field

Solving the equation for [tex]\theta[/tex], we find:

[tex]sin \theta = \frac{F}{qvB}=\frac{1.40\cdot 10^{-16}N}{(1.6\cdot 10^{-19} C)(5.06\cdot 10^3 m/s)(1.23 T)}=0.141[/tex]

which gives the following two angles:

[tex]\theta = 8.1^{\circ}\\\theta = 180^{\circ}-8.1^{\circ} = 171.9^{\circ}[/tex]

(a) 6.04 rev/s

The speed of the ball is given by:

[tex]v=\omega r[/tex]

where

[tex]\omega[/tex] is the angular speed

r is the distance of the ball from the centre of the circle

In situation 1), we have

[tex]\omega=8.13 rev/s \cdot 2\pi = 51.0 rad/s[/tex]

r = 0.600 m

So the speed of the ball is

[tex]v=(51.0 rad/s)(0.600 m)=30.6 m/s[/tex]

In situation 2), we have

[tex]\omega=6.04 rev/s \cdot 2\pi = 37.9 rad/s[/tex]

r = 0.900 m

So the speed of the ball is

[tex]v=(37.9 rad/s)(0.900 m)=34.1 m/s[/tex]

So, the ball has greater speed when rotating at 6.04 rev/s.

(b) [tex]1561 m/s^2[/tex]

The centripetal acceleration of the ball is given by

[tex]a=\frac{v^2}{r}[/tex]

where

v is the speed

r is the distance of the ball from the centre of the trajectory

For situation 1),

v = 30.6 m/s

r = 0.600 m

So the centripetal acceleration is

[tex]a=\frac{(30.6 m/s)^2}{0.600 m}=1561 m/s^2[/tex]

(c) [tex]1292 m/s^2[/tex]

For situation 2 we have

v = 34.1 m/s

r = 0.900 m

So the centripetal acceleration is

[tex]a=\frac{v^2}{r}=\frac{(34.1 m/s)^2}{0.900 m}=1292 m/s^2[/tex]

Final answer:

The rate of rotation that gives the greater speed for the ball is 8.13 rev/s. The centripetal acceleration of the ball at 8.13 rev/s is 39.43 m/s^2, while the centripetal acceleration at 6.04 rev/s is 32.90 m/s^2.

Explanation:

The rate of rotation that gives the greater speed for the ball is 8.13 rev/s. The speed of the ball is directly proportional to the rate of rotation. So, a higher rate of rotation will result in a greater speed for the ball.

The centripetal acceleration of the ball at 8.13 rev/s can be calculated using the formula:
centripetal acceleration = (angular velocity)^2 * radius
Plugging in the values:
centripetal acceleration = (8.13 rev/s)^2 * 0.6 m = 39.43 m/s^2

The centripetal acceleration of the ball at 6.04 rev/s can be calculated in the same way:
centripetal acceleration = (6.04 rev/s)^2 * 0.9 m = 32.90 m/s^2

Answer:

The block will be slide 0.36 m on the ice.

Explanation:

Given that,

Mass of arrow m₁= 80 g

Velocity of arrow u₁= 80 m/s

Mass of block m₂= 8.0 kg

Force F = 7.1 N

Using conservation of momentum

[tex]m_{1}u_{1}=m_{2}v_{2}[/tex]

[tex]80\times10^{-3}\times80=8.0\times v[/tex]

[tex]v =\dfrac{80\times10^{-3}\times80}{8.0}[/tex]

[tex]v = 0.8\ m/s[/tex]

The work done is equal to the change in kinetic energy

[tex]W=\Delta KE[/tex]

[tex]W=\dfrac{1}{2}mv^2[/tex]

[tex]W=\dfrac{1}{2}\times8.0\times0.8^2[/tex]

[tex]W=2.56\ J[/tex]

We know that,

The work is defined as,

[tex]W = F\cdot d[/tex]

[tex]d = \dfrac{W}{F}[/tex]

[tex]d=\dfrac{2.56}{7.1}[/tex]

[tex]d =0.36\ m[/tex]

Hence, The block will be slide 0.36 m on the ice.

The solution to the question is found by applying the principles of conservation of momentum to calculate the velocity of the block after collision and then using the work-energy theorem to find the distance the block slides on ice.

The calculation to find the answer to your question requires the usage of conservation of momentum and the theory of work. Firstly, we apply conservation of momentum, using the formula: initial momentum = final momentum.  Momentum, p=m*v, where m is mass and v is velocity. The initial momentum is the momentum of the arrow just before it hits the block, equal to (0.080 kg * 80 m/s). The block of ice initially is at rest, so it has no momentum.

Post-collision, the arrow and block move together, so the final momentum is (8.080 kg * V), with V being the velocity we wish to calculate. Set the initial and final momentum equal and solve for V.

Now we have the velocity of the block and arrow post-collision. The block slides until brought to rest by friction. Here we use the work-energy theory, where the work is equal to the change in kinetic energy. The work done by the friction force is (friction force * distance), and the change in kinetic energy is (1/2)*m*V^2 - 0. Solve for distance to find the answer.

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Answer:

Wavelength of light is 750 nm.

Explanation:

It is given that,

Frequency of light, [tex]\nu=4\times 10^{14}\ Hz[/tex]

The relationship between the wavelength and the frequency of light is given by :

[tex]c=\nu\times \lambda[/tex]

Where

c = speed of light

[tex]\nu[/tex] = frequency of light

[tex]\lambda[/tex] = wavelength of light

[tex]\lambda=\dfrac{c}{\nu}[/tex]

[tex]\lambda=\dfrac{3\times 10^8\ m/s}{4\times 10^{14}\ Hz}[/tex]

[tex]\lambda=7.5\times 10^{-7}\ m[/tex]

[tex]\lambda=750\ nm[/tex]

Hence, the correct option is (d) "750 nm".

The wavelength corresponding to light with a frequency of 4 x 10^14 Hz is found using the formula λ = c/f and equals 750 nm, falling within the visible spectrum.

The wavelength corresponding to a frequency of 4 x 10^14 Hz can be calculated using the equation c = λf, where c is the speed of light (3.0 × 10^8 m/s), λ is the wavelength in meters, and f is the frequency in hertz (Hz). To find the wavelength, we rearrange the equation to λ = c/f. Plugging in the values, we get λ = (3.0 × 10^8 m/s) / (4 x 10^14 Hz) which equals 750 nm. Therefore, the wavelength corresponding to light with a frequency of 4 x 10^14 Hz is 750 nm, which falls within the range of visible light wavelengths (400 nm to 750 nm).

She needs to move [tex]x[/tex] km in the east-west direction and [tex]y[/tex] km in the north-south direction so that

[tex]\sqrt{x^2+y^2}=2.17[/tex]

and

[tex]\tan29.6^\circ=\dfrac yx[/tex]

Solve the system to get

[tex]x=1.89\,\mathrm{km}[/tex]

[tex]y=1.07\,\mathrm{km}[/tex]

Answer:

The intensity of this wave and energy is 6.3385 N/m² and 2.0509 J.

Explanation:

Given that,

Electric field amplitude E₀= 69.1 V/m

Area A= 0.0247 m²

Time t= 13.1 s

We need to calculate the intensity

Using formula of intensity

[tex]S=\dfrac{1}{2}c\epsilon_{0}E_{0}^2[/tex]

Where, c = speed of light

Put the value into the formula

[tex]S=\dfrac{1}{2}\times3\times10^{8}\times8.85\times10^{-12}\times(69.1)^2[/tex]

[tex]S=6.3385\ N/m^2[/tex]

(b). We need to calculate the energy

Using formula of energy

[tex]E=SAt[/tex]

Where, A = area

t = time

S = intensity

Put the value into the formula

[tex]E =6.3385\times0.0247\times13.1[/tex]

[tex]E =2.0509\ J[/tex]

Hence, The intensity of this wave and energy is 6.3385 N/m² and 2.0509 J.

Answer:

The process in which heat flows by the mass movement of molecules from one place to another is C) convection.

Hope this helps :)

The process in which heat flows by the mass movement of molecules from one place to another is convection.

Heat transfer by convection is a method of heat transfer that involves the mass movement of molecules from one place to another.

Heat can also be transfered in the following methods;

Thus, the process in which heat flows by the mass movement of molecules from one place to another is convection.

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Answer:

The net force on him is zero.

Explanation:

The velocity of skydiver is constant.

As we know that the acceleration is rate of change in velocity. So, here velocity os constant it means acceleration of skydiver is zero.

According to Newton's second law

Force acting on a body is equal to the product of mass and velocity of the body.

As acceleration is zero that means the net force acting on the body is zero.

Answer:

D. 39 N m

Explanation:

m = mass of the weight used in crossfit workout = 7.0 kg

Force due to the weight used is given as

F = mg

F = (7.0) (9.8)

F = 68.6 N

d = distance of point of action of weight from shoulder joint = 0.57 m

τ = Torque about the shoulder joint due to the weight

Torque about the shoulder joint due to the weight is given as

τ = F d

Inserting the values

τ = (68.6) (0.57)

τ = 39 Nm

Explanation:

This problem can be solved using the Radioactive Half Life Formula:

[tex]A=A_{o}.2^{\frac{-t}{h}}[/tex] (1)

Where:

[tex]A=3.13mg[/tex] is the final amount of the material

[tex]A_{o}=50mg[/tex] is the initial amount of the material

[tex]t=19.7days[/tex] is the time elapsed

[tex]h[/tex] is the half life of the material (the quantity we are asked to find)

Knowing this, let's substitute the values and find [tex]h[/tex] from (1):

[tex]3.13mg=(50mg)2^{\frac{-19.7days}{h}}[/tex] (2)

[tex]\frac{3.13mg}{50mg}=2^{\frac{-19.7days}{h}}[/tex] (3)

Applying natural logarithm in both sides:

[tex]ln(\frac{3.13mg}{50mg})=ln(2^{\frac{-19.7days}{h}})[/tex] (4)

[tex]-2.77=-\frac{19.7days}{h}ln(2)[/tex] (5)

Clearing [tex]h[/tex]:

[tex]h=\frac{-19.7days}{-2.77}(0.693)[/tex] (6)

Finally:

[tex]h=4.928days[/tex]

The half-life is the period required for the quantity of a radioactive substance to become half its original quantity. By using given information and the half-life formula, we can calculate the half-life of the unknown radioactive substance.

The half-life of a radioactive substance is the time period required for the quantity of the substance to reduce to half its initial amount due to radioactive decay. This problem involves using the half-life formula: T = (t/log_2) * (log(N0/N)), where T is the half-life, t is the elapsed time, N0 is the initial quantity of the substance, and N is the quantity after time t.

From the question, we know N0 = 50.0mg, N = 3.13mg, and t = 19.7 days. Substituting these values into the formula allows us to calculate the half-life, which will give the answer.

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Answer:

Option (2)

Explanation:

The sun is a large astronomical body where there occurs the process of nuclear fusion. This process is responsible for the occurrence of two important things. Firstly, it helps in the conversion o f hydrogen atoms into helium, that fuels the energy of the sun, and secondly, it helps in the continuous conversion of matter into energy, that reaches the earth's surface and on which the living organisms are directly dependent on.

Thus, there occurs conversion of about 4 million tons of matter into energy every second.

Therefore, the correct answer is option (2).

Answer:

1.974 g

Explanation:

Electrochemical equivalent of copper, z = 0.000329 g/C

I = 10 A

t = 10 minutes = 10 x 60 = 600 seconds

By the use of Farady's law of electrolysis

m = z I t

m = 0.000329 x 10 x 600

m = 1.974 g

Using the physics of projectile motion, it can be calculated that a tennis ball shot vertically upward with an initial speed of 20 m/s will take approximately 2.04 seconds to reach its maximum height.

The subject of this question is the physics of motion, specifically projectile motion. The tennis ball is being shot vertically upward, so its motion can be considered as projectile motion. The time it takes for the ball to reach its maximum height can be calculated by using the vertical motion properties of projectiles. We know that the upwards velocity of the ball when released is 20 m/s and the acceleration due to gravity is -9.8 m/s² (indicating the ball is slowing as it rises, eventually down to 0 m/s at its highest point).

Now, to calculate time, we can use this formula for acceleration: 'v = u + gt'. Here, v is final vertical velocity, u is initial vertical velocity, g is acceleration due to gravity and t is the time. When the ball reaches its maximum height, its final vertical velocity will be 0. So we transform the formula to 't= (v-u)/g', and inputting the known values, '-(0 - 20 m/s)/-9.8 m/s², gives us a time of approximately 2.04 seconds

Thus, it will take approximately 2.04 seconds for the tennis ball to reach its maximum height.

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Answer:

2/(3π) ft/min ≈ 0.212 ft/min

Explanation:

Volume of a cone is:

V = ⅓ π r² h

The diameter is three times the altitude, so:

2r = 3h

r = 3/2 h

Substituting:

V = ⅓ π (3/2 h)² h

V = ⅓ π (9/4 h²) h

V = ¾ π h³

Taking derivative with respect to time:

dV/dt = 9/4 π h² dh/dt

Given dV/dt = 6 and h = 2:

6 = 9/4 π (2)² dh/dt

6 = 9π dh/dt

dh/dt = 2/(3π)

dh/dt ≈ 0.212 ft/min

Answer:

Part a)

U = 31.25 J

Part b)

U = 312.5 J

Explanation:

Part A)

A spring that requires a force of 50 N to be stretched 0.2 m from its equilibrium position.

So here we have

[tex]F = kx[/tex]

[tex]50 = k(0.2)[/tex]

k = 250 N/m

now the energy stored in the spring is given by

[tex]U = \frac{1}{2}kx^2[/tex]

[tex]U = \frac{1}{2}(250)(0.5)^2[/tex]

[tex]U = 31.25 J[/tex]

Part B)

A spring that requires 50 J of work to be stretched 0.2 m from its equilibrium position.

So here we know the formula of spring energy as

[tex]U = \frac{1}{2}kx^2[/tex]

[tex]50 = \frac{1}{2}k(0.2)^2[/tex]

[tex]k = 2500 N/m[/tex]

now by the formula of energy stored in spring

[tex]U = \frac{1}{2}kx^2[/tex]

[tex]U = \frac{1}{2}(2500)(0.5)^2[/tex]

[tex]U = 312.5 J[/tex]

Final answer:

The work required to stretch the first spring 0.5 m from its equilibrium position, given a spring constant of 250 N/m, is 31.25 J. For the second spring, with a spring constant of 2500 N/m, the work required is 312.5 J.

Explanation:

To calculate the work required to stretch the springs mentioned in the student's question, we use Hooke's law which is given by W = ½ k x², where W is the work done, k is the spring constant, and x is the displacement of the spring from its equilibrium position.

Part a

Given that a force of 50 N stretches the spring 0.2 m, we first determine the spring constant using F = k x:
k = F / x = 50 N / 0.2 m = 250 N/m.
Then, we calculate the work done to stretch the spring 0.5 m from its equilibrium position using W = ½ k x² = ½ × 250 N/m × (0.5 m)² = 31.25 J.

Part b

If 50 J of work is required to stretch the spring 0.2 m, the spring constant can be obtained by rearranging the work formula:
50 J = ½ k (0.2 m)², solving for k, yields k = 50 J / (0.5 × (0.2 m)²) = 2500 N/m.
Finally, calculating the work needed to stretch the spring 0.5 m from its equilibrium using W = ½ k x² = ½ × 2500 N/m × (0.5 m)² = 312.5 J.

Answer:

An electric motor is a device that changes electrical energy into mechanical energy. This change occurs due to the interaction between the magnetic field of magnets and the magnetic field due to the  electric current in the  loop. The interaction between the two produces a torque that makes the loop rotate on a shaft.

An electric motor is electric machinery that converts electrical energy supplied to it to mechanical energy.

It works on the principle of applying a magnetic field in electromagnetism.

A current-carrying loop is exposed to a magnetic field which results in torque.

The torque formed rotates the coil which is then followed by rotation of propellers as the current passes through the loop.

Explanation

An electric motor consist of a rotor- a moving part, commutator, brushes, axle, field-magnet, power supply and a stator- a part going around the rotor.

Answer:

The work done will be 57.15 J

Explanation:

Given that,

Mass = 12 kg

Distance = 3 m

Force = 22 N

Angle = 30°

We need to calculate the work done  

The work done is defined as,

[tex]W = Fd\cos\theta[/tex]

Where, F = force

d = displacement

Put the value into the formula

[tex]W=22\times3\times\cos30^{\circ}[/tex]

[tex]W=22\times3\times\dfrac{\sqrt{3}}{2}[/tex]

[tex]W = 57.15\ J[/tex]

Hence, The work done will be 57.15 J

Answer:

Coefficient of static friction required = 0.94

Explanation:

Coefficient of static friction required [tex]=\frac{v^2}{gR}[/tex]

Velocity, v = 120 km/h = 33.33 m/s

g = 9.81 m/s²

R = 120 m

Coefficient of static friction required[tex]=\frac{33.33^2}{9.81\times 120}=0.94[/tex]

Coefficient of static friction required = 0.94

Answer:

not that high, because worms are never that efficient

The efficiency of a worm gear transmitted at a power of 15HP and at 1150 rpm with a pitch of 0.75 inches and pitch diameter of 3 inches is 77%.

What is Worm gear?

A worm gear is a type of gear that utilizes a spiral-threaded shaft to drive a toothed wheel. One of the six simple machines is the vintage worm gear. A worm gear is essentially a screw butted up against what appears to be a typical spur gear with slightly curved and inclined teeth.

Given: Power of gear(P) = 15 hp,

Torque (N) = 1150 rpm;

The pitch of gear (p) = 0.75;

Pitch diameter (D₁) = 3 inches;

Pressure angle (α) = 14 1 / [tex]2^{0}[/tex];

Friction coefficient  (μ) = 0.12

If m is the module of gear, z is the no of teeth, γ is the worm lead angle and l is the length of gear then

l = [tex]\pi[/tex]mz

l = 238.75               (m = 1 / p = 2)

And  tanγ = 1 / [tex]\pi[/tex]D₁

γ = 44.92

Now If the efficiency is η then ;

η =(cosα - μtanγ) / (cosα + μtanγ)

η = 77%

Therefore, the efficiency is 77%

To know more about worm gear:

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Answer:

2.23 s

Explanation:

For a second-order reaction:

1 / [A] = 1 / [A]₀ + kt

Given [A] = 0.330 M, [A]₀ = 0.750 M, and k = 0.760 M⁻¹s⁻¹:

1 / 0.330 = 1 / 0.750 + 0.760t

t = 2.23

It would take 2.23 seconds.

Final answer:

To find the time it takes for a second-order reaction concentration to decrease from 0.750 M to 0.330 M at the given rate constant, we use the integrated second-order rate law. After substituting the given values and solving for time, we find that it takes approximately 1.20 seconds.

Explanation:

To calculate the time taken for the concentration of A to decrease from 0.750 M to 0.330 M in this second-order reaction, we can use the integrated second-order rate law which is given by:

[tex]\( \frac{1}{[A]_t} - \frac{1}{[A]_0} = k \cdot t \)[/tex]

Where [tex]\([A]_t\)[/tex] is the concentration of A at time t, [tex]\([A]_0\)[/tex] is the initial concentration of A, k is the rate constant, and t is the time.

Plugging in the values, we get:

[tex]\( \frac{1}{0.330 \ M} - \frac{1}{0.750 \ M} = 0.760 \ M^{-1}s^{-1} \cdot t \)[/tex]

After solving for t, we find that the time required is approximately 1.20 seconds. Note that the units of k given [tex](\( M^{-1}s^{-1} \))[/tex] are consistent with a second-order reaction, which confirms the correctness of the approach.

Answer:

Frequency

Explanation:

Photons are the packet of energy. They are massless and chargeless particles. They travel in the vacuum with the speed of light. The energy of photon is given by :

[tex]E=h\nu[/tex]

Where

h = Planck's constant

[tex]\nu[/tex] = frequency of photon

Or [tex]E=\dfrac{hc}{\lambda}[/tex]

c = speed of light

[tex]\lambda[/tex] = wavelength of photon

From the above equation, it is clear that the energy of photon is directly proportional to its frequency.