A 4.00 kg object is moving at 5.00 m/s NORTHWEST. It strikes a 6.00 kg that is moving SOUTHWEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The kinetic energy lost in the collision is
A. 20.4 J.
B. 28.7 J.
C. 34.8 J.
D. 40.2 J.
E. 45.1 J.
C. 34.8 J.
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Suppose a little bubble of air has gotten into the top of a mercury barometer. If a person uses a barometer in the usual way, the reading of atmospheric pressure will be
A. correct. B. lower than the actual value. C. higher than the actual value.
If a proton with mass 1.67 × 10^-27 kg moves in an accelerator such that its total energy is two times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 1.00 × 10^8 m/s c. 1.41 × 10^8 m/s b. 2.83 × 10^8 m/s d. 2.60 × 10^8 m/s
A boy scout will be burned more severely by
A) 100 g of water at 100°C. B) 100 g of steam at 100°C. C) both about equally D) neither of these
An unstable particle is moving at a speed of 2.6 × 108 m/s relative to a laboratory. Its lifetime is measured by a stationary observer in the laboratory to be 4.7 × 10-6 seconds
What is the lifetime of the particle, measured in the rest frame of the particle? (c = 3.00 × 108 m/s) What will be an ideal response?