A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 4.0 m/s2 . What is the magnitude of the cart's displacement during the first 6.0 s of its motion?
a. 10 m
c. 66 m
b. 55 m
d. 102 m
D
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A 400-g stainless steel tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 2.0 mm thick
At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3.0°C per minute. What is the difference in temperature between the inside and the outside of the bottom of the tea kettle? Assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of stainless steel is 16.3 W/m ? K, the specific heat of the steel is 448 J/kg ? K, and the specific heat of water is 4186 J/kg ? K. A) 2.2°C B) 1.5°C C) 1.1°C D) 0.50°C E) 0.15°C
A metal blade spins at a constant rate of 5.0 revolutions per second about a pivot through one end of the blade. This rotation occurs in a region where the component of the earth's magnetic field perpendicular to the blade is 30 ?T. If the blade is 60 cm in length, what is the magnitude of the potential difference between its ends?
a. 0.24 mV b. 0.20 mV c. 0.17 mV d. 0.27 mV e. 0.34 mV
A photon whose wavelength is = 5.0 × 10^?11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^?11 m b. 4.5 × 10^?11 m c. 5.5 × 10^?11 m d. 6.0 × 10^?11 m e. 6.5 × 10^?11 m
Why do we believe that starburst galaxies represent a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years at a time. B) Such galaxies produce so much light that they would have consumed all their gas long ago if they had always been forming stars at this high rate. C) We don't see any nearby starburst galaxies. D) All starburst galaxies look like normal spiral galaxies, aside from the starbursts.