Which of the following describes an object that is moving with an unchanging speed but a changing velocity?
A) A car slowing down while moving along a straight line.
B) A car rounding a curve at a steady 80 km/hr.
C) A car moving along a straight horizontal (level) line at a steady 80 km/hr.
D) A car moving up a straight hill [a hill whose "slope" is unchanging] at a steady 80 km/hr, when the car is midway up the hill.
E) Both answers C and D are correct.
B
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A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
A) 1 W. B) 10 W. C) 100 W. D) 1000 W. E) none of the above
An electron and a proton are traveling at the same speed. Which has the longer wavelength?
A) the electron B) the proton C) both the same D) none of the above
A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of mass can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3?
A) 1.5 × 103 kg B) 2.5 × 103 kg C) 0.50 × 103 kg D) 3.5 × 103 kg
Add and and express your answer in milligrams (mg) to the correct number of significant figures
A) 4.64 × 107 mg B) 4.64 × 104 mg C) 4.64 × 105 mg D) 4.64 × 106 mg