If 480 C pass through a 4.0-? resistor in 10 min, what is the potential difference across the resistor?
a. 3.6 V
b. 2.8 V
c. 2.4 V
d. 3.2 V
e. 5.0 V
d
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If the 14 billion year history of the universe were compressed to one year, and "now" is exactly midnight December 31, approximately how long ago were your grandparents born?
A) 0.15 second ago B) 1 second ago C) 1 minute ago D) 1 hour ago
Is the actual size of the universe larger than 14 billion light years?
A) The observable universe is 14 billion light years in each direction, so the actual universe is greater than 14 billion light years across. B) We do not have enough information to know this. C) The universe must be exactly equal in size to its age, so it must not be larger than 14 billion light years across in size. D) It is only 14 billion light years across to us; to an observer 10 billion light years away, it is smaller.
A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts down a ramp that makes an angle of 25.0° with the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.00 m down the ramp? A) 34.2 J B) 22.4 J C) 44.9 J D) 62.0 J E) This question cannot be answered without knowing the radius of the hoop.
A 10 kg bomb is moving NORTH with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0 kg fragment moving WEST with a speed of 8.0 m/s, a 4.0 kg fragment moving EAST with a speed of 10 m/s, and a third 1.0 kg fragment. What is the velocity of the third fragment?
A. zero B. 40 m/s NORTH C. 40 m/s SOUTH D. none of these answers are correct