A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?
Answers
200 x 2 = 400 watts
Answer:
Explanation:
Power = work/time
Work = force x distance
power = force X distance/time (velocity)
power = 200N x 2m/s
power = 400 joules
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Which statement best describes the relationship between forces?a.Magnetic and electrical forces are the most alike because they are both caused by positive and negative charges. b. Gravitational and magnetic forces are the most alike because they are both types of charges that occur in nature. c. Nuclear and magnetic forces are the most alike because they are both related to mass and weight. d. Strong nuclear force is most like electric because they are both related to distance.
How does an atom charge if all the electrons are removed
Answers
b. Mars and Jupiter.
c. Jupiter and Neptune.
d. Mars and Earth.
Answers
Answer:
b. Mars and Jupiter.
Explanation:
Asteroids are irregular sized and shaped rocky bodies -very small as compared to a planet which revolve around the sun in elliptical orbit. In the solar system, majority of the asteroids can be found in the asteroid belt which lies between the orbits of Mars and Jupiter. It is thought to be the debris of an unformed planet due to large gravity of Jupiter. Examples of asteroids - Ceres, Vesta, Eros etc.
Answers
Answer:
False
Explanation: Sticking fingers into a wall socket will bring us into direct contact with an electrical current because human body is a conductor of electricity. Effect of electric current is visible when circuit of flow is complete. In this case when we touch live wire or socket human body complete its circuit and get an electric shock. Sometimes this can be avoided by wearing footwear made up of insulator.
Answers
Answer: The correct answer is option D.
Explanation:
Chemical reactions are defined as the reactions in which rearrangement of one or more substances gets converted to one or more different substances known as products. Energy is released in the reactions where energy of products is less than the energy of the reactants.
Nuclear reactions are the reactions in which atomic nucleus undergoes change and releases a huge amount of energy in the process. There are two types of nuclear reactions: Nuclear fusion and nuclear fission. Both the nuclear reactions releases a huge amount of energy.
From the given information above, we conclude that the correct option is Option D.
Answers
Answer: The kinetic energy of the block increases by 15 Joules.
Explanation:
Work done is defined as the product of force and displacement of the object.
Mathematically,
where,
W =work done
F = force
s = Displacement
Kinetic energy is defined as the energy which is possessed by the virtue of object's motion.
In the question, it is given that work done on block is 15 Joules and we need to find the change in kinetic energy of the block.
We know that,
Work done on the object = Change in kinetic energy of the object
Thus, Kinetic energy is increased by 15 Joules.
The kinetic energy depends on the work done by the applied force. The kinetic energy of the block increases by 15 J.
What is kinetic energy?
The energy possessed by an object by its motion is known as the object's kinetic energy.
Given data-
The magnitude of the constant horizontal force is F = 5 N.
The work done on the block is, W = 15 J.
As per the work-energy theorem, the work done by the applied force is equal to the change in kinetic energy.
Then,
W = ΔKE
Solving as
15 = ΔKE
ΔKE = 15 J
Thus, we can conclude that the block's kinetic energy increases by 15 J.
Learn more about kinetic energy here:
Answers
Here is the rule for see-saws here on Earth, and there is no reason
to expect that it doesn't work exactly the same anywhere else:
(weight) x (distance from the pivot) on one side
is equal to
(weight) x (distance from the pivot) on the other side.
That's why, when Dad and Tiny Tommy get on the see-saw, Dad sits
closer to the pivot and Tiny Tommy sits farther away from it.
(Dad's weight) x (short length) = (Tiny Tommy's weight) x (longer length).
So now we come to the strange beings on the alien planet.
There are three choices right away that both work:
#1).
(400 N) in the middle-seat, facing (200 N) in the end-seat.
(400) x (1) = (200) x (2)
#2).
(200 N) in the middle-seat, facing (100 N) in the end-seat.
(200) x (1) = (100) x (2)
#3).
On one side: (300 N) in the end-seat (300) x (2) = 600
On the other side:
(400 N) in the middle-seat (400) x (1) = 400
and (100 N) in the end-seat (100) x (2) = 200
Total . . . . . . . . . . . . 600
These are the only ones to be identified at Harvard . . . . . . .
There may be many others but they haven't been discarvard.