A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is the mass of the boat? (b) What is the acceleration? (c) How large is the net force acting on the boat?
(a) 500 kg, (b) 4 m/s2, (c) 2,000 N
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A hoop is rolling without slipping along a horizontal surface with a speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal. What is the speed of the hoop after it has rolled 3.00 m up the ramp?
A) 4.22 m/s B) 1.91 m/s C) 2.06 m/s D) 3.79 m/s E) 8.02 m/s
What did the Greek philosopher Philolaus believe about the Universe? a. No parallax seen of new stars means Earth is the center of the Universe. b. Perfect heavens must be made of up spheres rotating at constant rates. c. The most perfect geometrical form was the sphere
d. The heavens are perfect and Earth is imperfect. e. Earth moved around a central fire.
If an object has a larger potential energy than kinetic energy,
A. the speed of the object will increase. B. the speed of the object will decrease. C. It is not possible to predict what the speed will be; it depends on the situation D. the speed of the object will not change.
The prefix yotta (Y) signifies a multiple of 1024. How many yottameters are there in a gigameter?
What will be an ideal response?