The International Space Station is orbiting at an altitude of about 370 km above the earth's surface. The mass of the earth is 5.976 × 1024 kg and the radius of the earth is 6.378 × 106 m
(a) Assuming a circular orbit, what is the period of the International Space Station's orbit? (b) Assuming a circular orbit, what is the speed of the International Space Station in its orbit?
(a) 5.52 × 103 s
(b) 7.69 × 103 m/s
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The change in the frequency of a wave due to the motion of the source (or observer) is known as
A) the Bell effect. B) the Mach effect. C) the Doppler effect. D) interference. E) diffraction.
Motional Emf: It is known that birds can detect the earth's magnetic field, but the mechanism of how they do this is not known. It has been suggested that perhaps they detect a motional emf as they fly north to south, but it turns out that the induced voltages are small compared to the voltages normally encountered in cells, so this is probably not the mechanism involved. To check this out, calculate the induced voltage across the wingtips of a wild goose with a wingspan of 1.2 m if it is flying directly south at 13 m/s at a point where the earth's magnetic field is 5.0 ×10-5 T directed downward from the horizontal by 40?.
A. 0.50 mV B. 0.60 mV C. 0.78 mV D. 0.060 mV E. 0.25 mV
A rock is thrown straight up and reaches a maximum height. Which of the following describes the motion at the maximum height?
A. the velocity is zero and the acceleration is zero B. the velocity is maximum and the acceleration is zero C. the acceleration is increasing and the velocity is zero D. the acceleration is not changing and the velocity is zero
A woman standing on the surface of Earth has a mass of 70 kg and a weight of 700 N. If instead she is floating freely inside a non-rotating space habitat far from Earth, her mass would be
1) less than 70 kg 2) 70 kg 3) more than 70 kg and her weight would be 4) less than 700 N. 5) 700 N. 6) more than 700 N.