A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N
b. 3.8 N
c. 4.2 N
d. 4.6 N
e. 6.5 N
B
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The natural frequencies for a stretched string of length L, and wave speed v, are Nv/(2L) where N equals
A) 0, 1, 2, 3, ... B) 2, 4, 6, 8, ... C) 1, 2, 3, 4, ... D) 0, 1, 3, 5, ... E) 1, 3, 4, 5, ...
In this figure, a cork attached to a string floats in an inverted jar filled with water. Compare the cork to a helium balloon attached to a car seat. (See the "Physics on Your Own" box on page 164 of your textbook). As the jar shown here is accelerated, you would expect the cork to behave:
a. similar to the balloon in an accelerating car. b. the opposite of the helium balloon in an accelerating car. c. in a way that is unrelated to the balloon.
If the lever arm of a 9-N force is 6 m, what is the torque acting on the object due to this force?
a. 54 Nm b. 1.5 Nm c. 0.67 Nm d. 15 Nm e. cannot be determined
Exoplanets having masses between 2 and 10 Earth masses are called ________
Fill in the blank(s) with correct word