A simple pendulum is suspended from the ceiling of a stationary elevator, and the period is measured. If the elevator moves with constant velocity, the period
1.increases.
2.decreases.
3.remains the same.
3
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A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?
A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s b. 0.75 km/s c. 0.81 km/s d. 0.87 km/s e. 0.41 km/s
Which planet is very hot because of an extreme greenhouse effect?
a) Mars b) Earth c) Venus d) Mercury e) Jupiter
The density of water at 4°C will slightly decrease when it is
A) cooled. B) warmed. C) both of these D) none of the above