An Earth satellite is in circular orbit 230 km above the surface of the Earth. It is observed to have a period of 89 min. From this information, estimate the mass of the Earth
What will be an ideal response?
6.0 × 1024 kg
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If a person in Alaska were locked out of his house on a day when the temperature outside was -40°C, his thick clothing would mostly reduce the loss of thermal energy by
a. conduction. b. convection. c. radiation. d. all of the above. e. convection and radiation.
A ball vibrates back and forth from the free end of an ideal spring having a spring constant of 20 N/m. If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position?
A) 0.00 J B) 0.22 J C) 0.45 J D) 0.90 J E) 1.4 J
Terminal Voltage and Internal Resistance: A battery has an emf ? = 78.0 V and an internal resistance r = 4.0 ?, as shown in the figure. A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b. The power dissipated by the resistor R is closest to
A. 280 W. B. 340 W. C. 320 W. D. 300 W. E. 370 W.
A proton is released from rest in a uniform electric field. Determine whether the following quantities increase, decrease, or remain unchanged as the proton moves.
Indicate your answers with I, D, or U, respectively. (a) the electric potential at the proton's location (b) The proton's associated electric potential energy (c) Its kinetic energy (d) Its total energy