Mechanical energy
a. is the automobile energy.
b. is the sum of kinetic and potential energies.
c. is the kinetic energy.
d. is the potential energy.
b
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A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.5 m in a time of 2.0 s. The acceleration of the ball is
A. 0.25 m/s2. B. 0.125 m/s2. C. 0.5 m/s2. D. 1.0 m/s2.
If the net force on an object is zero,
a. there must be no forces acting on the object b. the object must be at rest c. the object's acceleration must be zero d. there can be no friction acting on the object
Which of these will penetrate into lead?
A) alpha particle B) beta particle C) gamma ray. D) all of the above
A camera gives a correct exposure at f/4 with a shutter speed of 1/128 s. In order to increase the depth of field, the f-stop is changed to f/8. What shutter speed will now give a correct exposure if lighting conditions do not change?
1.1/512 s 2.1/256 s 3.1/32 s 4.1/16 s