A 8.00-kg bowling ball falls from a 3.50-m shelf. Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)
a. 280 J
b. 49.0 J
c. 2.86 J
d. 274 J
e. 28.0 J
d
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A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces
A) 5.8 × 105 J B) 3.4 × 105 J C) 4.0 × 105 J D) 4.9 × 105 J
The Earth is 1.49 × 10^11 m from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the Sun?
a. 2.34 × 10^30 W c. 6.62 × 10^26 W b. 3.74 × 10^26 W d. 7.48 × 10^27 W
Power: Suppose you left five 100-W light bulbs burning in the basement for two weeks. If electricity costs 10.0¢/kW?h, (a) how much did the electricity cost (to the nearest dollar) to leave those bulbs on, and (b) how many joules of electrical energy did they consume?
What will be an ideal response?
Which of the following measurements can be made only by recording and comparing the amount of light received from an astronomical source at many different times?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the number of bright stars in a nearby star cluster