A 4.0 kg mass is moving with speed 2.0 m/s. A 1.0 kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?
A) the 4.0 kg mass
B) the 1.0 kg mass
C) Both travel the same distance.
D) Cannot be determined from the information given.
C
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1. Pav = 0 and iave = 0 2. Pav = 0 and iave > 0 3. Pav > 0 and iave = 0 4. Pav > 0 and iave > 0
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The heating coil of a hot water heater has a resistance of 20 ohms and operates at 210 V. If electrical energy costs 5.5 cents per kW-hr, what does it cost to raise the 200 kg of water in the tank from 15°C to 80°C? (The specific heat of water is 4 186 J/kg°C)
Plane Mirrors: An object that is 75 cm tall is located 3.8 m in front of a plane mirror. The image formed by the mirror appears to be
A. 1.9 m in front of the mirror. B. on the mirror's surface. C. 1.9 m behind the mirror's surface. D. 3.8 m in front of the mirror. E. 3.8 m behind the mirror's surface.