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

Physics & Space Science

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The hydroxide ion has a charge of

a. 1–. b. zero. c. 1+. d. 2+.

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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.

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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?

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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

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