A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N
b. 3.0 N
c. 3.4 N
d. 3.8 N
e. 2.3 N
C
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A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 31 cm?
A) 199 N B) 91.0 N C) 145 N D) 279 N
A car is driven 1 200 m north at 20.0 m/s and then driven 1 600 m east at 25.0 m/s. What is the magnitude of the average velocity for this trip?
a. 16.1 m/s b. 22.6 m/s c. 31.3 m/s d. 11.3 m/s e. 62.2 m/s
All the planet's orbits are evenly spaced
Indicate whether the statement is true or false
Which statement about planetary rings is not true?
A) Saturn's rings formed along with its moons 4.6 billion years ago. B) All four jovian planets have rings. C) Individual ring particles orbit their planet in accord with Kepler's laws, so that particles closer in orbit faster than particles farther out. D) Rings are always located closer to a planet's surface than any large moons.