A rock is moving with speed v. If the mass of the rock were tripled and the speed were reduced to v/3, which of the following statements would be true?
a. The kinetic energy of the rock is smaller than in the first case, but the momentum is larger.
b. The kinetic energy of the rock is smaller than in the first case, but the momenta of both are the same.
c. The kinetic energies of the rocks are the same in both cases.
d. The kinetic energy of the rock is 1/9 its previous value.
B
You might also like to view...
In a room where g = 9.81 m/s2, a hockey puck slides off the edge of a platform with an initial velocity of 28.0 m/s horizontally. The height of the platform above the ground is 2.00 m
What is the speed of the puck just before it hits the ground? The air resistance is negligibly small. A) 28.7 m/s B) 6.26 m/s C) 28.0 m/s D) 48.2 m/s E) 26.3 m/s
If the turn-off point of a cluster lies about type F, this cluster is very ________
Fill in the blank(s) with correct word
The electrolysis of water breaks up the water molecules into hydrogen and oxygen, as shown in this photo. Why is the volume of the hydrogen that is collected twice the volume of the oxygen collected?
a. Hydrogen atoms are twice as big as oxygen atoms. b. There are twice as many hydrogen atoms in water as there are oxygen atoms. c. Oxygen atoms are 16 times as massive as hydrogen atoms. d. A gas formed from oxygen gas particles takes up twice as much space as a gas formed from the same number of hydrogen gas particles under identical conditions. e. The hydrogen occurs as H2 molecules of two atoms each while the oxygen is just single O atoms.
The Cassini spacecraft:
A. flew past Pluto. B. landed on Mars. C. orbited Saturn.