A 0.30-kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of 52.0 N/m. The block is initially displaced 3.20 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.36 m/s
b. 0.596 m/s
c. 1.67 m/s
d. 0.421 m/s
e. 2.28 m/s
d
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A projectile is launched from ground level at 15° above the horizontal and lands downrange. What other projection angle for the same speed would produce the same down-range distance?
A) 30° B) 45° C) 50° D) 75° E) 90°
A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22.°C. Which gas molecules have the greater average speed?
A) The oxygen molecules do because they are diatomic. B) The helium molecules do because they are monatomic. C) The oxygen molecules do because they are more massive. D) It is the same for both because the temperatures are the same. E) The helium molecules do because they are less massive.
Which planet has the largest satellite in the Solar System?
A. Saturn B. Mercury C. Mars D. Uranus E. Jupiter
Consider a wire at rest in a magnetic field as shown in the following figure. What will happen to the wire?
a.
A current will flow in the wire.
b.
The wire will be pushed perpendicular to the plane of the magnetic field.
c.
The wire will be pushed toward the north pole.
d.
Nothing will happen.