A bullet of mass 0.010 kg and speed of 200 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 second. The magnitude of the impulse delivered to the bullet by the block during this time is
A. 0.98 N.
B. 2.0 Ns.
C. 1.0 Ns.
D. zero.
E. 4.0 Ns.
Answer: B
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Hanna, at rest in her spaceship which is moving past Earth at 0.800c, observes a neutron at rest relative to her spaceship decay into a proton, an electron and a neutrino. She notes that the total momentum, 
, of the decay products is zero after the decay. According to an observer on Earth, the magnitude of the total momentum of the decay products, 
, is
A. 0. B. 0.600mn(0.800c) C. 0.800mn(0.800c). D. 1.00mn(0.800c). E. 1.67mn(0.800c).
In South Africa, it's usually quite warm around the time of the Northern Hemisphere winter solstice and quite cool around the time of the summer solstice
Indicate whether the statement is true or false
A freely falling object has a constant acceleration of 9.8 m/s2 . This means that
a. the object's displacement changes by 9.8 m every second squared. b. the object's speed increases by 9.8 m/s each second. c. the object's acceleration increases by 9.8 m/s2 each second. d. the object travels 9.8 m each second.
In vacuum, the components of an EM wave are 
and 
0. What 
?
a. 
b. 
c. 
d. 
e. More information is needed.