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Why do we write F=Gm1m2/d2 for the gravitational force on an object when it is far from the Earth but F=mg for the gravitational force on it when it is near the Earth's surface?
As noted above, the volume of a sphere is 4/3 pi^3. Write out an equivalent expression of this volume in terms of its diameter (d) since it is d that will be gauged: (an exercise in algebra)
A small sphere with mass 9.00 ?g and charge ?4.30?C is moving in a circular orbit around a stationary sphere that has charge +7.50?C. what is the radius of its orbit
A triply ionized beryllium ion, Be^3+ (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom, What is the ground-level energy of the beryllium
Jupiter has mass M, radius R and orbital period T, while the Sun has mass m, radius r and orbital period t. Calculate the ratio of the centrifugal acceleration to the gravitational acceleration at the equator of
How various kilograms of nitrogen are boiled away in time of 7.50 h. car that hits a line of water barrels and takes 1.8s to stop.
The eyepiece of a refracting astronomical telescope has a focal length of 8.60 centimeters. Evaluate the angular magnification of the telescope
A person rides a motorbike 190 m along a road that slants upward at 9.0 o from the horizontal. How far has the rider gone in the horizontal direction? How much higher will the rider be at the end of the trip?
Demonstrate that gravitational energy is not extensive: show that the gravitational energy of a sphere of radius 'r' and uniform density varies with volume V^n and find the exponent 'n'.
A satellite in Earth orbit has a mass of 92 kg and is at an altitude of 2.04 106 m. (Assume that U = 0 as r ? infinity.) (a) What is the potential energy of the satellite–Earth system? J (b) What is the magnitude of the gravitational force exerted..
You exert a force of 21 N on the head of a thumbtack. The head of the thumbtack has a radius of 5 mm. What is the pressure on your thumb
Consider a series LRC circuit with R=201 ?, L=0.34 H and C=1 µF. The current is 10 mA amplitude at 2 kHz. Remember ? = 2pf, where f is the frequency in cycles per second or Hz. Find the voltage amplitude VL on the coil. Express the answer with two..
a determine the capacitance of a teflon-filled parallel-plate capacitor having a plate area of 1.90 cm2 and insulation
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