A tennis ball bounces on the floor three times, and during each bounce 23% of its kinetic energy (assuming that at the collision with the floor the ball-Earth system only had kinetic energy) is converted to internal energy
How high does it go after the third bounce, if we released it 4.0 m from the floor? A) 180 cm
B) 18 cm
C) 180 mm
D) 240 cm
A
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An electron (m = 9.1 × 10^?31 kg) has a speed of 0.90 c. What is the difference between its relativistic momentum and its non-relativistic momentum (in kg m/s)?
a. 4.3 × 10^?22 b. 3.2 × 10^?22 c. 5.4 × 10^?22 d. 6.5 × 10^?22 e. 2.5 × 10^?22
When a proton and an antiproton collide
a. they destroy each other and produce energy in the form of gamma rays. b. one of the protons is converted to a neutron and they form nucleus of one proton and one neutron. c. one of the protons is converted to an electron and they form a hydrogen atom. d. one proton is converted to a neutron and the other is converted to an electron. e. A proton and an antiproton can not collide because the Coulomb barrier is too great.
While a rock is falling straight down with negligible air resistance, it has
A) an unchanging speed. B) an increasing speed. C) a decreasing speed. D) zero speed. E) None of the above.