An airplane flies horizontally with a speed of 300 m/s at an altitude of 400 m. Assume that the ground is level. At what horizontal distance from a target must the pilot release a bomb so as to hit the target?
a. 3.0 km
b. 2.4 km
c. 3.3 km
d. 2.7 km
e. 1.7 km
d
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Which of the following has the most kinetic energy?
A) a 4-ton truck moving 20 km/hr B) a 3-ton truck moving 30 km/hr C) a 2-ton truck moving 40 km/hr D) a 1-ton truck moving 50 km/hr E) A, B, C, and D all have the same kinetic energy.
Standing waves of frequency 57 Hz are produced on a string that has mass per unit length 0.0160 kg/m. With what tension must the string be stretched between two supports if adjacent nodes in the standing wave are to be 0.71 meters apart?
What will be an ideal response?
The hydroxide ion has a charge of
a. 1–. b. zero. c. 1+. d. 2+.
A CD player uses a laser with wavelength 900 nm. If the CD has a plastic coating with index 1.50, what is the wavelength in the plastic?
a. 600 nm c. 1350 nm b. 500 nm d. 750 nm