Find the upward velocityt by multiplying the speed by the cos of the angle.
= 40 x cos(20) = 37.588 m/s
Round to 38 m/s
The answer is D.
Answer: I choose A
Explanation:
How does Electromagnetic Energy Travel?
Answer:
Perpendicular to the electric field and magnetic field
Explanation:
Electromagnetic waves are transverse waves composed by the perpendicular oscillating electric and magnetic fields.
EM waves have both Electrical and magnetic features.
they travel in the velocity of light (3*10⁸ ms⁻¹)
they does not require any media to travel. It has two perpendicular electric field and the magnetic field which are perpendicular to each other
They travel perpendicular to each of those electric and magnetic fields.
Given the scenario: A 45 kg. object is being pushed north with a force of 8N, and at the same time, it is been pushed east with a force of 6N. What will the magnitude and direction be of the resultant vector?
Answer:
10 N, [tex]53.1^{\circ}[/tex] north-east
Explanation:
The two forces applied on the object are perpendicular to each other, so we can find the magnitude of their resultant by using the Pythagorean theorem:
[tex]R=\sqrt{(6 N)^2 + (8 N)^2}=10 N[/tex]
The direction of the force instead is given by
[tex]\theta = tan^{-1} (\frac{F_n}{F_e})[/tex]
where F_n is the force pointing north, and F_e is the force pointing east, and the angle is measured with respect to the east direction. Substituting,
[tex]\theta=tan^{-1} (\frac{8 N}{6 N})=tan^{-1} (1.333)=53.1^{\circ}[/tex]
At which landing site would the lander have the greatest amount of gravitational potential energy? W X Y Z
Answer: the answer would be X
Explanation:
Answer:
X
Explanation:
The energy possessed by the position of the body is called gravitational energy. The formula for the gravitational potential energy is given by
U = m x g x h
Gravitational Potential energy of W:
m x g x h = m x 1.6 x 32 = 51.2 m
Gravitational Potential energy of X:
m x g x h = m x 3.7 x 16 = 59.2 m
Gravitational Potential energy of Y:
m x g x h = m x 1.6 x 35 = 56 m
Gravitational Potential energy of Z:
m x g x h = m x 3.7 x 12 = 44.4 m
The gravitational potential energy is maximum for X
A leaf floating down from a tree is an example of an object in free fall.
Answer:
Oi, mate its false
Explanation:
because if an leaf floats down from a tree it is not considered an object for a free-fall
Answer:
False
Explanation:
What are the two main types of energy?
a. potential and electrical
b. radiant and kinetic
c. electrical and thermal
d. kinetic and potential
The two major types of energy is option d, kinetic and potential energy.
Answer:
the answe is d your welcome
Explanation:
The more active a cell is, the more of these structures it has.
What are these structures?
a. ribosomes
b. chromosomes
c. mitochondria
d. vacuoles
Answer:pretty sure its mitochondria
Explanation:
A car travelling with 20 m/s , comes to halt after travelling 18 m .Find the time taken by the car to stop.
Answer:
The answer is 1.8 m/s.
Explanation:
Formula of speed is given below:
Speed, V = Distance / time
Given data:
Distance, d = 18 m
Initial veliocity = 20 m/s
Final velocity = 0 m/s
Time taken, t = ?
Find average speed:
Average speed =( initial velocity + final velocity)/2
= (20 + 0)/ 2
= 20/2 = 10 m/s
Average speed = distance / time
Time = distance / Average speed
Time, t = 18m / 10ms-1 = 1.8 m/s
The time taken by the car is 1.8 m/s
How much heat is absorbed by a 70g iron skillet when its temperature rises from 13oC to 28oC?
The answer is:
The heat absorbed by the iron skillet is equal to 473 Joules.
Why?To solve the problem, we need to use the formula to calculate the quantity of heat absorbed, also, we need to remember that specific heat of the iron, which is equal to:
[tex]s=\frac{0.45J}{g*\°C }[/tex]
Where,
J, is the energy transferred.
g, is the mass of the object or substance.
°C, is the temperature measured in Celsius degrees.
We can calculate the heat absorbed using the following equation:
[tex]q=m*dT*s[/tex]
Where,
q, is the heat absorbed
m, is the mass of the object
dT, is the change in temperature
s, is the specific heat of the substance.
We are given the following information:
[tex]mass=70g\\dT=28\°C-13\°C=15\°C\\s=\frac{0.45J}{g*\°C }[/tex]
So, substituting and calculating, we have:
[tex]q=m*dT*s[/tex]
[tex]q=70g*15\°C*\frac{0.45J}{g*\°C }=472.5J=473J[/tex]
Hence, the heat absorbed is equal to 473 Joules.
Have a nice day!
Which objects has such a strong surface gravity that light cannot escape it?
Black holes.
Although black holes don't have surface they are the only known object that has gravity that not even light can escape it.
A steel ball rolls with a constant velocity on a tabletop 0.950 m high it rolls off and hit the ground 0.352 m from the edge of the table. How fast was the ball rolling ?
Answer:
0.799 m/s if air resistance is negligible.
Explanation:
For how long is the ball in the air?
Acceleration is constant. The change in the ball's height [tex]\Delta h[/tex] depends on the square of the time:
[tex]\displaystyle \Delta h = \frac{1}{2} \;g\cdot t^{2} + v_0\cdot t[/tex],
where
[tex]\Delta h[/tex] is the change in the ball's height. [tex]g[/tex] is the acceleration due to gravity. [tex]t[/tex] is the time for which the ball is in the air.[tex]v_0[/tex] is the initial vertical velocity of the ball. The height of the ball decreases, so this value should be the opposite of the height of the table relative to the ground. [tex]\Delta h = -0.950\;\text{m}[/tex].Gravity pulls objects toward the earth, so [tex]g[/tex] is also negative. [tex]g \approx -9.81\;\text{m}\cdot\text{s}^{-2}[/tex] near the surface of the earth. Assume that the table is flat. The vertical velocity of the ball will be zero until it falls off the edge. As a result, [tex]v_0 = 0[/tex].Solve for [tex]t[/tex].
[tex]\displaystyle \Delta h = \frac{1}{2} \;g\cdot t^{2} + v_0\cdot t[/tex];
[tex]\displaystyle -0.950 = \frac{1}{2} \times (-9.81) \cdot t^{2}[/tex];
[tex]\displaystyle t^{2} =\frac{-0.950}{1/2 \times (-9.81)}[/tex];
[tex]t \approx 0.440315\;\text{s}[/tex].
What's the initial horizontal velocity of the ball?
Horizontal displacement of the ball: [tex]\Delta x = 0.352\;\text{m}[/tex]; Time taken: [tex]\Delta t = 0.440315\;\text{s}[/tex]Assume that air resistance is negligible. Only gravity is acting on the ball when it falls from the tabletop. The horizontal velocity of the ball will not change while the ball is in the air. In other words, the ball will move away from the table at the same speed at which it rolls towards the edge.
[tex]\begin{aligned}\text{Rolling Velocity}&=\text{Horizontal Velocity} \\&= \text{Average Horizontal Velocity}\\ &=\frac{\Delta x}{\Delta t}=\frac{0.352\;\text{m}}{0.440315\;\text{s}}=0.0799\;\text{m}\cdot\text{s}^{-1}\end{aligned}[/tex].
Both values from the question come with 3 significant figures. Keep more significant figures than that during the calculation and round the final result to the same number of significant figures.
The steel ball was rolling at approximately 0.8 m/s when it fell off the table. This was determined using the physics principles of projectile motion and the known values of acceleration due to gravity, vertical displacement, and horizontal displacement.
Explanation:This physics question involves the concept of projectile motion. Contrary to horizontal motion, the vertical motion is affected by gravity. Ignore air resistance for simplicity.
When the steel ball falls off the table, it freely falls under acceleration due to gravity which is approximately 9.8 m/s², being directed downward. From the time it leaves the edge of the table to the time it hits the ground, it experiences a vertical displacement of 0.950 m (the height of the table).
Let's use the equation: y = V0yt + 0.5gt². Here y is the displacement (0.950 m), g is acceleration due to gravity (9.8 m/s²), and V0y is the initial vertical velocity of the ball, which is zero since the ball is moving horizontally on the table. So, we can solve this equation for time (t).
Inserting known values: 0.950 m = 0.5*(9.8 m/s²)*t². We solve for t and get t = sqrt((2*0.950 m)/(9.8 m/s²)) ~= 0.44 s.
The speed of the ball right before it falls off the table is the horizontal component of velocity, which remains constant throughout the whole motion. The horizontal distance the ball travels is 0.352 m. We can use this along with the time it takes to travel this distance to solve for horizontal speed (Vx).
Since Vx = x/t, we have Vx = 0.352 m / 0.44 s, so Vx ~= 0.8 m/s.
So, the steel ball was rolling at approximately 0.8 m/s when it fell off the table.
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suppose you increase your walking speed from 6 m/s to 13 m/s in a period of 3 s. what is your acceleration
Answer:
2⅓ m/s²
Explanation:
Average acceleration is the change in velocity over change in time.
a = Δv / Δt
a = (13 m/s - 6 m/s) / 3s
a = 2⅓ m/s²
a ≈ 2.33 m/s²
A new ride being built at an amusement park includes a vertical drop of 71.6 meters. Starting from rest, the ride vertically drops that distance before the track curves forward. If the velocity at the bottom of the drop is 10.0 m/s and the mass of the cart and passengers is 3.5 x 104 kg, how much potential energy was converted into thermal energy (heat)?
A. 2.3 x 10^7 J
B. 2.6 x 10^7 J
C. 4.3 x 10^7 J
D. 6.7 x 10^7 J
Answer:
The correct answer is A
Explanation:
I did the test twice and A) 2.3 x 10^7 J was correct.
Final answer:
The potential energy converted into thermal energy (heat) is 2.38 x 10^7 J.
Explanation:
The amount of potential energy converted into thermal energy (heat) can be calculated using the principle of conservation of energy. The initial potential energy of the ride is equal to the final kinetic energy at the bottom of the drop. The change in potential energy is given by the formula ΔPE = mgh, where m is the mass, g is the acceleration due to gravity, and h is the height. Substituting the given values, we have ΔPE = (3.5 x 10^4 kg)(9.8 m/s^2)(71.6 m) = 2.38 x 10^7 J.
Which item is made from a synthetic material? A. cotton pants B. leather jacket C. tissue paper D. wicker basket
Answer:
is the letter A
Explanation:
Out of choices which is given above, Wicker basket is the only product which is made from a synthetic material.
Answer: Option D
Explanation:
Cotton is entirely different from synthetic fibers which is very soft fabric and absorbs heat ghastly compared to other materials. People living in area with mostly summer prefer cotton. Leathers are used in cold climatic regions which protects them from experiencing cold temperature. Tissue papers are made from paper pulp and so from the given options wicker basket is the only one made of synthetic material.
Matter is made up of very small particles called
Answer:
atoms
Explanation:
Answer:
The answer is atoms
Explanation: A definition of "matter" more fine-scale than the atoms and molecules definition is: matter is made up of what atoms and molecules are made of, meaning anything made of positively charged protons, neutral neutrons, and negatively charged electrons.
Which of the following type of personal debts is usually considered wise and justified? A. credit card purchases of luxuries that you want immediately B. a loan for the car you have always dreamed about C. money to pay off other debts and interest D. home mortgage
Answer:
C. Money to pay off other debts and interest
Money to pay off other debts and interest are usually considered wise and justified.
Answer:Option c
Explanation:
Personal loans give persons an access to funds that can be used as their wish and they are unsecured. This means that they do not need you to put down collateral for obtaining the loan.
A personal loan usually has higher rate of interests than that of secured loan. They offer lower rate of interest than credit cards. It is advisable to use personal loans to pay off debts form credit cards will support you in saving interests and help you to get out of the debt faster period of time.
During the Water Wheel simulation you were able to change the flow of water
through the system. The water flow represents
the flow of neutrons
the flow of protons
the flow of electrons
the flow of photons
Answer:
The flow of photons
Explanation:
Final answer:
The flow of water in the Water Wheel simulation represents the flow of electrons, similar to how electrons flow through a circuit.
Explanation:
The flow of water in the Water Wheel simulation represents the flow of electrons. Just like water flowing through a system, electrons can flow through a circuit, powering devices and creating electric current. Changing the flow of water in the simulation is similar to adjusting the flow of electrons in a circuit by changing the voltage or resistance.
racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
Vo = 30 m/s Vf = 26 m/s, t = 20ms = 0.02s
A = Vo + Vf / t
A = 30 + 26 / 0.02
A = 56 /0.02
A = 2800 m/s^2
The average acceleration of the racket is 2,800 m/s²
The given parameters include;
initial speed of the racket, u = 30 m/s
recoil velocity of the racket, v = 26 m/s
time of collision, t = 20 m/s
To find:
the average acceleration of the racketLet the backward or recoil velocity be in negative direction
The average acceleration of the racket is calculated as;
[tex]average \ acceleration \ =\frac{\Delta \ velocity}{\Delta \ time} = \frac{v - u}{t} \\\\average \ acceleration \ = \frac{-26 - 30}{20 \times 10^{-3}}= \frac{-56}{20 \times 10^{-3}} = -2,8 00\ m/s^2\\\\magnitude \ of \ average \ acceleration = 2,800 \ m/s^2[/tex]
Thus, the average acceleration of the racket is 2,800 m/s²
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solve 305809 square root by division method
What kind of energy is represented by KE?
Answer:
Explanation:
Depends on what you are measuring.
For example, in Chemistry, KE is measuring temperature. Temperature is the average of all the molecules present and their motion (using a gas as our base).
In physics, KE at beginning levels, is the speed of a moving object.
The four best metallic conductors are: A. gold B. cadmium C. alloys D. copper E. silver F. sodium G. aluminum H. iron I have to pick 4
Answer:
Explanation:
I can give you four for certain.
Copper
Gold
Silver
Aluminum
Drop the ball on the floor and observe its motion. Identify all the energy forms associated with the ball at these times:
about to be dropped
falling down
hitting the floor
moving back up
Answer:
about to be dropped-------------gravitational potential energy
falling down.................................Kinetic energy
hitting the floor.............................potential energy
moving back up...........................Kinetic energy
Explanation:
When the ball is about to be dropped it possesses potential energy.This is the energy stored in an object.When the ball is released, the potential energy will be converted to kinetic energy.Kinetic energy is the energy an object has due to its motion.When the ball hits the floor, energy is lost in form of siund and heat.The kinetic energy when falling will be transformed to potential energy which is lesser than the initial one when the ball was about to be dropped.The ball bounces back after hitting the floor.The potential energy is converted back to kinetic energy .
Answer:
About to be dropped-Gravitational potential energy
Falling down-Kinetic energy
Hitting the floor-Potential energy
Explanation:
A diode is a semiconductor that is used to --
allow current to flow only in one direction
turn the flow of electricity on and off
amplify electrical signals
create a magnetic field
Answer:
Allows current to flow in one direction.
Explanation:
Answer:Diodes can be used as rectifiers, signal limiters, voltage regulators, switches, signal modulators, signal mixers, signal demodulators, and oscillators. The fundamental property of a diode is its tendency to conduct electric current in only one direction.
Explanation:
Plz help, its for my CFE in physical science honors.
Glen is explaining the relationship between the wavelength and frequency of electromagnetic radiation to his friend, Harold. Which of the following would be a correct explanation of this relationship?
A. All electromagnetic waves have the same frequency, but different wavelengths
B. If a wave has a long wavelength, it will have a low frequency.
C. If a wave has a low frequency, it will have an equally low wavelength.
D. The frequency of a wave is not related to its wavelength.
Answer: B
f=c/wavelength
So we see if the wavelength is larger then the frequency gets smaller and the smaller the wavelength the higher the frequency.
Any questions feel free to ask. Thanks
Final answer:
Glen's correct explanation is that if a wave has a long wavelength, it will have a low frequency, showing the inverse relationship between frequency and wavelength for electromagnetic waves.
Explanation:
Glen is explaining the relationship between the wavelength and frequency of electromagnetic radiation to his friend, Harold. The correct explanation of this relationship is embodied in option B: If a wave has a long wavelength, it will have a low frequency. This principle is underpinned by the universal speed of light (c), at which all electromagnetic waves travel. The relationship among these characteristics can be represented by the equation c = fλ, where c is the speed of light, f is the frequency, and λ is the wavelength. Thus, for all electromagnetic waves, a greater frequency implies a smaller wavelength and vice versa, demonstrating an inverse relationship between these two properties.
Question is In Image Provided
Answer:
i would think the first two, but i cant be sure.
Explanation:
Which pair of properties apply to both sound and electromagnetic waves?
A) Both waves carry energy and refract.
B) Both waves are longitudinal and carry energy.
Eliminate
C) Both waves are transverse and need a medium.
D) Both waves carry energy and do not need a medium to travel through.
The answer would be A because sound waves and electomagnetic waves carry energy and they can both refract.
Answer: A. Both waves carry energy and refract.
Explanation: Rarefaction is where vibrating particles are spread apart.
the words bin and bean. rot and rat are examples of (blank)
Answer:
the correct answer is homonyms
Explanation: Hope it helped
Answer:
MINIMAL PAIRS
Explanation:
got it correct on plato
Read each scenario and then answer the question scenario a 120 J of work is done in 6 seconds Scenario b 160 J of work is done in 8 seconds scenario c 200 J of work is done in 10 seconds which scenario uses the most power
Answer:
all scenarios are using the same power
Explanation:
we know that power is defined as P(Watts)=W(Joules)/t(seconds).
When applying this formula to each of the scenarios we find:
[tex]\frac{120J}{6s}=\frac{160J}{8s}=\frac{200J}{10s}= 20W[/tex]
Done
A box is pulled up a rough ramp that makes an angle of 22
degrees with the horizontal surface. The surface of the
ramp is the x-plane,
What is the magnitude of the force of tensionit te ne
force in the direction of 98 N2
57N
139 N
178N
183N
F = 650N
F = 700NFO
Answer:
139 N
Explanation:
Thats the answer on e2020
The significance of the force of hysteria force inside the path of 98 N2 is 139 N.
SOLUTION:
given force = 98 N
the angle of pulling = 22 °
force = 98 cos22°
= 139 N
What's the importance of the pressure?The importance of the pressure is the variety that represents the energy of the pressure. for instance: think the force is = 10 N closer to the east. 'towards east' shows the path at the same time as '10' is the importance of the pressure. So basically, magnitude is the 'value' or 'amount' of any bodily amount.
The bodily force exerted on an item. The force implemented is perpendicular to the surface of gadgets in line with unit area. The simple formula for stress is . Unit of stress is Pascals (Pa).
A simple instance of strain can be visible via preserving a knife to a bit of fruit. if you hold the flat part of the knife against the fruit, it won't cut the floor. The pressure is spread out of a huge place.
What is a pressure solution?The frenzy or pull on an item with mass that causes it to alternate its pace. Force is an outside agent able to change the state of relaxation or movement of a particular frame.
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For a stationary observer, when the source of sound is moving, its pitch appears to change.
T.
or
F.
Answer:
I believe it is true.
Explanation:
Hope my answer has helped you!
Hello There!
This is "True"
For a stationary observer, when the source of sound is moving, its pitch appears to change.
What's one indirect consequence of building seawalls?
Seawalls, groins, jetties and other shoreline stabilization structures have had tremendous impacts on our nation's beaches. Shoreline structures are built to alter the effects of ocean waves, currents and sand movement. They are usually built to "protect" buildings that were built on a beach that is losing sand.
Answer:
Seawalls are made for coastal defense purposes
Explanation:
Seawalls are massive structures which are designed to prevent coastal erosion and other damages due to wave action during huge storms such as hurricanes.
My family used to live near one. It are very satisfying to watch during rain storms, because you can hear the sound of the rain falling on top of it. I also loved watching the waves hit the sea wall then roll back down.
Hope this helps. ( Sorry I go a little carried off)