Answer:
right away because you should never speed
Answer:
New potential energy will be 784 J
So option (b) will be correct answer
Explanation:
We have given height of the shelf h = 10 m
Potential energy E = 980 J
Acceleration due to gravity
We know that potential energy
So
m = 10 kg
Now new height h = 8 m
So new potential energy
So option (B) will be the correct answer
Answer:
a. the work done by the gravitational force on Block A is <u>less than</u> the work done by the gravitational force on Block B.
b. the speed of Block A is <u>equal to</u> the speed of Block B.
c. the momentum of Block A is <u>less than</u> the momentum of Block B.
Explanation:
a. The work done by the gravitational force is equal to:
w = m*g*h
where m is mass, g is the standard gravitational acceleration and h is height. Given that both blocks are released from rest at the same height, then, the bigger the mass, the bigger the work done.
b. With ramps frictionless, the final speed of the blocs is:
v = √(2*g*h)
which is independent of the mass of the blocks.
c. The momentum is calculated as follows:
momentum = m*v
Given that both bocks has the same speed, then, the bigger the mass, the bigger the momentum.
Answer:
When two balls are raised from one end and released, they strike the row and two balls pop out from the other end. If instead, one ball popped out with twice the speed of the two, this would violate <u>law of conservation of energy</u>.
Explanation:
"According to law of conservation of energy, energy can neither be created nor destroyed it only changes it's states."
we can prove it as
the initial momentum = 2mv
if one ball popped out with 2v then the momentum would be conserved.
But the initial kinetic energy of these two balls are given as
but if the speed of one ball is twice then that of other one then the kinetic energy won't remain conserved.
thus it violates the law of conservation of energy.