The force needed to lift an object is equal in size to the gravitational force on the object. How much work is done in lifting an object that has a mass of 5 kg a vertical distance of 2 m?
Answer:
Work done in lifting the object = 98 J
Explanation:
Work: Work can be defined as the product of force and distance.
The S.I unit of work is Joules (J).
Mathematically it can be expressed as
W = F × d................. Equation 1
Where W = work done, F = force needed to lift the object, d = distance
The gravitational force on the object = Weight of the object
Weight of the object = mg .................. Equation 2
Where m = mass of the object, g = acceleration due to gravity
Given: m = 5 kg,
Constant: g = 9.8 m/s²
Substituting these values into equation 2
Weight of the object = 5 × 9.8
Weight of the object = 49 N
Since weight of the object = force needed to lift the object,
F = 49 N
Also Given: d = 2 m
Substituting these values into equation 1
W = 49 × 2
W = 98 J
Work done in lifting the object = 98 J
hope this helps
plz can i get brainliest:)
21) A youngster having a mass of 50.0 kg steps off a 1.00 m high platform. If she keeps her legs fairly rigid and comes to rest in 10.0 ms, what is her momentum just as she hits the floor? What average force acts on her during the deceleration?
Answer:
-22,150 N
Explanation:
When the youngster jumps off the platform, during the fall her initial potential energy is converted into kinetic energy, according to the law of conservation of energy. Therefore, we can write:
[tex]mgh=\frac{1}{2}mu^2[/tex]
where the term on the left is the potential energy while the term on the right is the kinetic energy, and where
m = 50.0 kg is the mass of the youngster
[tex]g=9.8 m/s^2[/tex] is the acceleration due to gravity
h = 1.00 m is the heigth of the platform
u is the speed of the youngster as she reaches the floor
Solving for u,
[tex]u=\sqrt{2gh}=\sqrt{2(9.8)(1.00)}=4.43 m/s[/tex]
Then, when the youngster hits the floor, the force exerted on her during the deceleration is given by:
[tex]F=\frac{\Delta p}{\Delta t}=\frac{m(v-u)}{\Delta t}[/tex]
where [tex]\Delta p[/tex] is her change in momentum, and where
m is the mass
v = 0 is the final velocity (she comes to a stop)
u = 4.43 m/s is the initial velocity
[tex]\Delta t=10.0 ms =0.010 s[/tex] is the duration of the collision
Substituting,
[tex]F=\frac{(50.0)(0-4.43)}{0.010}=-22150 N[/tex]
And the negative sign means the direction of the force is opposite to the motion (so, upward).
Three resistors with values of 4.0 W, 6.0 W, and 8.0 W, respectively, are connected in series. What
is their equivalent resistance?
The answer would be 18 W
The equivalent resistance of three resistors with values of 4.0 ohms, 6.0 ohms, and 8.0 ohms connected in series is 18.0 ohms.
The question asks for the equivalent resistance of three resistors connected in series with resistance values of 4.0 ohms, 6.0 ohms, and 8.0 ohms. When resistors are connected in series, the equivalent resistance (Requiv) is the sum of the individual resistances. The formula used is Requiv = R1 + R2 + R3.
Applying the given values:
Requiv = 4.0 Ω + 6.0 Ω + 8.0 Ω
Requiv = 18.0 Ω.
Therefore, the equivalent resistance of the three resistors connected in series is 18.0 ohms.
If a 4 Hz wave travels 2000 meters per second what is the wavelength
Answer:
500m
Explanation:
See attachment below
when water droplets in clouds become heavy, they fall to earth as _______ ?
A - evaporation
B - condensation
C - permafrost
D - precipitation
Answer:D: Precipitation please give brainliest
Explanation: As liquid is heated by the sun's warmth, it changes into a gas form and rises in the atmosphere. In the air, water vapor cools and returns to a liquid form. ... These water droplets cling together and form clouds. When the droplets become heavy enough, they fall to the ground as precipitation.
Final answer:
Water droplets in clouds fall to Earth as precipitation (option D) when they become heavy enough. This precipitation can fall as rain, snow, sleet, or hail, depending on the air temperature.
Explanation:
When water droplets in clouds become heavy, they fall to Earth as precipitation (option D). This process occurs when water vapor in the atmosphere condenses into tiny droplets of liquid water, forming clouds. If these droplets accumulate enough mass, they can no longer be supported by the air currents in the cloud and fall to the ground as various forms of precipitation, depending on the temperature of the air. Warm air will usually cause the droplets to fall as rain, while cold air can lead to snow, sleet, or hail.
a heavy object falls with the acceleration as a light object during free fall. why?
A heavy object falls with the acceleration as a light object during free fall because:
Heavy things have a large gravitational force and also have less acceleration. So both the effects exactly cancel and make the falling objects to have the same acceleration irrespective of mass.
Free fall is a unique motion which has only gravitational force that acts on an object. Objects that undergo free fall experience only have the influence of gravity and not any other force.
So when we apply newton's second law of gravity which is:
[tex]\text {acceleration}=\frac{\text {Force}}{\text {mass}}[/tex]
where,
F is the force
m is the mass
a is the acceleration
For example: When a 1000 kg elephant and a 1 kg rat fall from the same height,
The acceleration can be calculated as follows:
For elephant: F = 10000 N and m = 1000 kg. So,
[tex]\text {acceleration}=\frac{10000}{1000}=10\ \mathrm{m} / \mathrm{s}^{2}[/tex]
For rat : F = 10 N and m = 1 kg
Thus, [tex]\text {acceleration}=\frac{10}{1}=1\ \mathrm{m} / \mathrm{s}^{2}[/tex]
Hence, it shows that both the animals have the same acceleration irrespective of their mass.
10) Suppose you have a transparent material that is more dense than glass. How would the light ray be
affected? Y
According to the law of reflection, When a ray of light passes from rarer medium to denser medium , it bends towards the normal. So, if there is a transparent material that is more dense than glass then the ray of light will bend towards the normal. The direction of light through the medium is predicted by Snell's Law. According to the Snell's law:
n₁ sin θ₁ = n₂ sin θ₂
Where n₁ is the refractive index of the first medium
n₂ is the refractive index of second medium.
θ₁ and θ₂ are the angle of incidence of light in medium 1 and medium 2
Which products rely on the ability of ionic compounds to conduct electricity?
Cell phones and remote control toys are the products which rely on the ability of ionic compounds to conduct electricity.
Explanation:
Ionic compounds are those which are formed between electronegative and electropositive elements. So some of the electrons will be always free in these compounds. Among the options given in the question, cell phones and remote control toys are the products which uses ionic products. As most of the semiconducting compounds or electronic compounds are ionic in nature. And cell phones and remote control toys uses the movement of electrons from ionic compounds to do the work.
Thus, cell phones and remote control toys are the products which rely on the ability of ionic compounds to conduct electricity.
Answer:
(B) cell phones
Explanation:
jus took the quiz
Select the correct answer.
Which statement best explains that sound waves are pressure waves?
A.
Sound waves have regions of compressions and rarefactions.
B. Sound waves cannot propagate through metals.
C. Sound waves move perpendicular to the medium particles.
D. Sound waves cannot propagate through water.
Answer:
C
Explanation:
Sound waves move perpendicular to the medium particles.
Answer:
its c for sure
Explanation:
How does secondhand smoke affect children?
It increases their asthma rates.
It increases their attention span.
It increases their learning ability.
It increases their chance of obesity.
Answer:
It increases asthma rates
Explanation:
Charles' Law
4. A gas has a volume of 4 liters at 50 °C. What will its volume be in liters) at 100°C?
Therefore, the volume of the gas at temperature 100°C is 4.62L
Explanation:
Given-
Volume, V1 = 4L
Temperature, T1 = 50°C = 50 + 273K = 323K
Temperature, T2 = 100°C = 100 + 273K = 373K
Volume, V2 = ?
Using Charles law:
V1/T1 = V2/T2
4/323 = V2/373
V2 = 4.62L
Therefore, the volume of the gas at temperature 100°C is 4.62L
A circuit has a voltage drop of 24.0 V across a 30.0 resistor that carries a
current of 0.800 A. What is the power conducted by the resistor? Use P = VI.
O A. 19.2 W
O B. 1.25 W
O c. 24.0 W
O
D. 720.0 W
(A) 19.2 W
Explanation:
Given-
Voltage drop, V = 24 V
Resistor = 30Ω
Current, I = 0.8 A
Power, P = ?
We know,
P = VI
P = 24 (0.8)
P = 19.2 W
Therefore, the power conducted by the resistor is 19.2 W
Answer:
19.2
Explanation:
011 10.0 points
A sound wave has a frequency of 798 Hz in air
and a wavelength of 0.48 m.
What is the temperature of the air? As-
sume the velocity of sound at 0°C is 329 m/s.
Answer in units of °C.
vil
Explanation:
From the Newton's velocity of sound relationship , the velocity of sound is directly proportional to the square root of temperature .
In this case The velocity of sound = frequency x wavelength
= 798 x 0.48 = 383 m/sec
Suppose the temperature at this time = T K
Thus 383 ∝ [tex]\sqrt{T}[/tex] I
The velocity of sound is 329 m/s at 273 K ( given )
Thus 329 ∝ [tex]\sqrt{273}[/tex] II
Dividing I by II , we have
[tex]\frac{383}{329}[/tex] = [tex]\sqrt{\frac{T}{273} }[/tex]
or [tex]\frac{T}{273}[/tex] = 1.25
and T = 339.8 K = 66.8° C
What are the answer for the blanks
What type of chemical reaction occurs when less energy is released during the chemical reaction than is needed to start the chemical reaction
Answer:
Endothermic reaction
Explanation:
If the reaction releases less energy than the energy needed to start the chemical reaction, then the reaction takes energy from the system. An endothermic reaction is a reaction that will takes energy from the system. Those energies will be put into the product of the reaction, make the product have higher potential energy than the reactant. The product of this reactant will be less stable since it's at a high energy state.
The type of chemical reaction where less energy is released than is required to initiate the reaction is called an endothermic reaction.
Explanation:A chemical reaction that requires more energy to start than is released during the reaction is called an endothermic reaction. These reactions absorb energy from their surroundings, and the energy required to initiate the reaction is called the activation energy. Endothermic reactions have a net absorption of energy because the energy needed to break the bonds in the reactants is greater than the energy released from forming new bonds in the products. For example, photosynthesis is an endothermic reaction where the energy from sunlight is absorbed to convert carbon dioxide and water into glucose.
A wave with a frequency of 17 Hz has a wavelength of 4 meters. At what speed (in m/s) will this wave travel?
Answer:68m/s
Explanation:
Frequency=17Hz
Wavelength=4metre
Wave speed=frequency x wavelength
Wave speed =17 x 4
Wave speed =68m/s
6. Water flows through a 9,6-cm-diameter fire hose with a speed of 1.3 m/s. At the end of
the hose, the water flows out through a nozzle whose diameter is 2.5 cm. What is the
speed of water coming out of the nozzle?
A) 4.99cm/s
B) 0.339m/s
C) 0.088m/s
D) 19.2m/s
Can someone please answer this question
Answer:
D) 19.2 m/s
Explanation:
We can solve this problem by using the continuity equation: in fact, the flow rate a fluid through a pipe must remain constant.
Therefore, we can write:
[tex]A_1 v_1 = A_2 v_2[/tex]
where
[tex]A_1[/tex] is the cross-sectional area of the 1st section of the pipe
[tex]A_2[/tex] is the cross-sectional area of the 2nd section of the pipe
[tex]v_1[/tex] is the velocity of the water in section 1
[tex]v_2[/tex] is the velocity of the water in section 2
For the pipe in the problem we have:
[tex]d_1=9.6 cm = 0.096 m[/tex] is the diameter of the hose, so the area is
[tex]A_1=\pi (\frac{d_1}{2})^2[/tex]
[tex]d_2=2.5 cm = 0.025 m[/tex] is the diameter of the nozzle, so the area is
[tex]A_2=\pi (\frac{d_2}{2})^2[/tex]
[tex]v_1=1.3 m/s[/tex] is the velocity of water in the hose
Solving the equation for v2, we find the speed of water in the nozzle:
[tex]v_2=v_1\frac{A_1}{A_2}=v_1 \frac{d_1^2}{d_2^2}=(1.3)\frac{(0.096)^2}{(0.025)^2}=19.2 m/s[/tex]
A 30 kg child climbs 15 meters up a tree. When he looks around, when is the child’s potential energy ?
Answer:
Gravitational potential energy of the child = 4410 J.
Explanation:
Given data:
Mass of the child, [tex]m = 30 \ kg[/tex]
Mass of the child, [tex]h = 15 \ m[/tex]
The gravitational potential energy of the child at 15 m height can be given as,
[tex]GPE = mgh[/tex]
[tex]GPE = 30 \times 9.80 \times 15[/tex]
[tex]GPE = 4410 \ \rm J.[/tex]
The potential energy of the child is 4410J
POTENTIAL ENERGY:
The potential energy (P.E) of a body refers to its energy at a position. The potential energy can be calculated using the formula below:P.E = mass (m) × gravitational force of the Earth (g) × height (h)
Where; g = 9.8m/s²
According to this question, a 30 kg child climbs 15 meters up a tree, his potential energy can be calculated thus:P.E = 30kg × 15m × 9.8m/s²
P.E = 4410Joules.
Therefore, the potential energy of the child is 4410J.Learn more at: https://brainly.com/question/24284560?referrer=searchResults
2. What is the speed (v) of a wave that has a wavelength (a)
of 2 m and a frequency (f) of 6 Hz?
Answer:12m/s
Explanation:
Frequency=6Hz
Wavelength=2m
Wave speed=frequency x Wavelength
Wave speed=6 x 2
Wave speed=12m/s
The speed of a wave with a frequency of 6 Hz and a wavelength of 2 m is 12 m/s.
Explanation:The speed (v) of a wave is calculated by the formula v = fλ, where 'f' is the frequency and 'λ' (lambda) is the wavelength. Given the frequency (f) of 6 Hz and a wavelength ('λ') of 2 m, we can compute the speed of the wave using this formula:
v = 6 Hz × 2 m = 12 m/s.
Therefore, the speed of the wave is 12 meters per second (12 m/s).
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Monochromatic radiation of frequency greater than the threshold frequency is incident on a metal do all the electrons emitted by photoelectric emission have the same kinetic energy.
Yo sup??
No it isn't necessary that they will have the same Kinetic energy.
Hope this helps
Through which of the following can sound energy NOT be transferred?
Answer:
Vacuum
Explanation:
Sound energy as mechanical wave cannot be transmitted through a vacuum.
As a wave, which is a disturbance that transmits energy from one point to another, it requires a material medium for propagation.
Sound energy is a mechanical wave. It requires particles and a medium to be propagated. By so doing, this form of energy cannot be transmitted through a vacuum body. In such bodies, there is no medium of propagation.A hydraulic lift is used to lift a heavy box that is pushing down on a 1.5-m2 piston with a force of 1,700 N. What force needs to be exerted on a 0.12-m2 piston to lift the box?
Answer:
136 N
Explanation:
Pressure on large piston = pressure on small piston
F₁ / A₁ = F₂ / A₂
1700 N / 1.5 m² = F / 0.12 m²
F = 136 N
What is the oscillation period of your eardrum when you are listening to the A4 note on a piano (frequency 440 Hz)?
The period is the inverse of the frequence:
[tex]T=\dfrac{1}{f}=\dfrac{1}{440}=0.0022\overline{72}[/tex]
Answer:
T = 0.002 s.
Explanation:
Given data:
Frequency, [tex]f = 440 \ \rm Hz[/tex]
The time period of oscillation of the eardrum can be expressed as,
[tex]T = \frac{1}{f}[/tex]
[tex]T = \frac{1}{440 \ \rm Hz}[/tex]
[tex]T = 0.002 \ s.[/tex]
When a train first starts going down the railroad, it is very difficult for it to get going. When it comes to a stop, it has a hard time slowing down. Why is this?
A: balanced forces
B: unbalanced forces
C: inertia
Explanation:
When we apply the force on any body , the inertia comes into play . It is the tenancy of the the body to oppose the force which tends to change its state .
In first case the train tries to change its state from rest to motion . Thus the inertia of rest opposes this tendency.
In the second case , the train tries to come from motion to the state of rest . Thus again , inertia opposes it .
Therefore inertia is the factor which creates difficulty in both case . Hence option ( c ) is correct
How many dwarf planets are there in the solar system
Answer: 5
Explanation: There are 5 recognized dwarf planets in our solar system; Ceres, Pluto, Haumea, Makemake and Eris.
Answer:
5
Explanation:
There are only 5 dwarf planets that are officially recognized and they are Ceres, Pluto, Haumea, Makemake and Eris.
At 15°C air is transmitted
at 340 m/s. Express this speed
in Kilometers per hour.
Answer:
1224km/hr
Explanation:
To convert from m/s to km/hr
1000m = 1km
Divide both sides by 1000
1m = 1/1000 km................. (1)
60×60 seconds = 1 hr
3600s = 1hr
Divide both sides by 3600
1s = 1/3600 .............(2)
Divide (2) by (1)
1m/s = 1/1000 ÷ 1/3600 km/hr
1m/s = 1/1000 × 3600/1 km/hr
1m/s = 3600/1000 km/hr
1m/s = 3.6 km/hr .............(3)
To convert 340m/s to km/hr
Multiply (3) by 340
1× 340m/s = 3.6 × 340 km/hr
340m/s = 1224km/hr
I hope this was helpful, please mark as brainliest
Answer:
1224 km/hr
Explanation:
Method 1to convert m/s to km/hrrecall that :
1km = 1000m
firstly lets convert m to km
340 m to km
340 / 1000
= 0.34 km
recall that :
1hr = 60 min
1 min = 60 seconds
hence 1 hr = 60*60
1 hr = 3600 seconds
now to convert seconds to hr :1 second / 3600
=1/3600 hours
hence to get the answer you say :
[tex]\frac{0.34}{\frac{1}{3600} }[/tex]
= 1224 Method 2recall : 1km = 1000m
recall: 1hr = 60 min
1 min = 60 seconds
hence 1 hr = 60*60
1 hr = 3600 seconds
now to get this answer you have to divide m by 1000 to get km
and you have to divide seconds by 3600 to get hours
= [tex]\frac{340 / 1000}{1/3600}[/tex]
= 1224Select all the correct answers.
Which three statements about electromagnetic radiation are true?
0
Light is a kind of electromagnetic radiation.
0
Electromagnetic radiation can travel only short distances.
O
Electromagnetic radiation has no mass.
O
Electromagnetic radiation can travel through a vacuum.
All kinds of electromagnetic radiation are invisible.
Yo sup??
the 1st, 3rs and 4th statement are true because electromagnetic waves can travel large distances and electromagnetic waves are visible (only 400-700 nm wavelenght)
Hope this helps
ASAP please help with this
Answer:
4) 1 - mass; 5) 3 - Their masses and how far apart they are; 6) See the explanation below.
Explanation:
4)
The force of gravity between two bodies is defined by the following equation.
[tex]F_{g}=\frac{m_{1}*m_{2}*G}{d^{2}}\\ where:\\G = Universal gravitation constant = 6,674 *10^{-11} [N*m^2/kg^2] \\m_{1}= mass 1\\m_{2}= mass 2\\d = distance between the 2 bodies[/tex]
We can see that the gravity force depends on the masses and the distance between them.
5)
The gravity force depends on the masses and the distance between them.
[tex]F_{g}=\frac{m_{1}*m_{2}*G}{d^{2}}\\ where:\\G = Universal gravitation constant = 6,674 *10^{-11} [N*m^2/kg^2] \\m_{1}= mass 1\\m_{2}= mass 2\\d = distance between the 2 bodies[/tex]
6)
The heaviest object found at the bottom of the container is the copper block, since its density is the largest even larger than that of the liquid at the bottom.
The next block is the rubber one, we can see that it's floating over the corn syrup fluid. This is because the density of the rubber block is less than that of the corn syrup, so the block floats.
The next block is plastic, with a density of 1.17 (g/cm^3). This block is located between glycerin liquids and water.
The block on the surface of the container is wood, this density is 0.71[ g / cm^ 3] a density less than that of corn oil.
What is the mass of an object that has a density of 1.3 g/cm3 and a volume
of 2 cm3? (The density of an object has the equation d =m/v.)
O
O A. 1.5 g
O B. 3.39
O C. 0.7g
O D. 2.6g
O
Answer:
D.[tex]2.6g[/tex]
Explanation:
To find mass of object, you use the equation Density=Mass/Volume
Density=[tex]1.3g/cm^3[/tex]
Volume=[tex]2cm^3[/tex]
[tex]Mass=Density\ \times \ Volume\\=1.3g/cm^3\times2cm^3\\=2.6g[/tex]
The object's mass is 2.6g
The mass of the object is 2.6g. The correct answer is Option D.
Explanation:You can use the formula for density to find the mass of the object:
Density (d) = Mass (m) / Volume (v)
Rearrange the formula to solve for mass:
Mass (m) = Density (d) x Volume (v), where d is the density, m is the mass, and v is the volume. Rearranging the equation, we have m = d * v. Plugging in the values given in the question, we get m = 1.3 g/cm3 * 2 cm3. Multiplying these values together, we find that the mass of the object is 2.6g.
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I need help, Ill glady appreciate any responses
I know I am a smart person, but my doubtness does not let me
How can I start believing more on myself?
How can I be more confident?
Answer: Answer: First, You should try to think positive thoughts. Then, you should try and pinpoint your achievements. You often see your failures more than the success. Moreover, you should go check the impostor syndrome in ted ed. If you are trying to be more confident in your school choices than you should try to check the information again or try to go back and remember the time you studied the subject assignments you are doing.
Explanation: That other guy gave a great answer but can you still give a brainliest?