Debris blasted from the impact of a crater is called ____
a. ejecta
b. maria
c. sinuous rilles
d. multiringed basin
e. central peak
Answer : a. ejecta
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Equilibrium: Three objects are connected by weightless flexible strings as shown in the figure. The pulley has no appreciable mass or friction, and the string connected to the block on the horizontal bench pulls on it parallel to the bench surface. The coefficients of friction between the bench and the block on it are µs = 0.66 and µk = 0.325. You observe that this system remains at rest.(a) Find the mass of the hanging object A.(b) What is the magnitude of the friction force on the block on the bench?
Fill in the blank(s) with the appropriate word(s).
Momentum: A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The clay sticks to the wall. Which one of these objects experiences the greater momentum change?
A. the ball B. the clay C. Both of them experience the same non-zero momentum change. D. Both of them experience zero momentum change.
Which of the following best describes the composition of the particles forming Saturn's rings?
A) methane ice B) hydrogen and helium C) water ice D) metallic grains E) volcanic rock
You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph?
A) The force of friction needs to be four times as large. B) The force of friction needs to be twice as large. C) the force of friction is the same for both speeds since the radius of curvature is the same. D) None of the above