COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 10, Problem 38QAP
To determine
Magnitude of force of gravity between the Sun and Earth
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In a judo foot-sweepmove, you sweep your opponent’sleft foot out from under him whilepulling on his gi (uniform) towardthat side. As a result, your opponentrotates around his right footand onto the mat. Figure 10-44shows a simplified diagram ofyour opponent as you face him,with his left foot swept out. Therotational axis is through point O.The gravitational force on himeffectively acts at his center ofmass, which is a horizontal distanced = 28 cm from point O.Hismass is 70 kg, and his rotational inertiaabout point O is 65 kg m2.What is the magnitude of his initialangular acceleration about point O if your pull on his gi is (a) negligibleand (b) horizontal with a magnitude of 300 N and applied atheight h = 1.4 m?
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Chapter 10 Solutions
COLLEGE PHYSICS
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- The acceleration due to gravity on the surface of a planet is three times as large as it is on the surface of Earth. The mass density of the planet is known to be twice that of Earth. What is the radius of this planet in terms of Earth’s radius?arrow_forwardA young woman buys an inexpensive used car stock car racing. It can attain highway speed with an acceleration of 8.40 mi/h s. By making changes to its engine, she can increase the net horizontal force on the car by 24.0%. With much less expense, she can remove material from the hotly of the car to decrease its mass by 24.0%. (a) Winch of these two changes. if either, will result, in the greater increase in the cars acceleration? (b) If she makes both changes. what acceleration can she attain?arrow_forwardIt has been suggested dial rotating cylinders about 20 km in length and 8 km in diameter be placed in space and used as colonies. The purpose of the rotation is to simulate gravity for the inhabitants. Explain this concept for producing an effective imitation of gravity.arrow_forward
- A synchronous satellite, which always remains above the same point on a planets equator, is put in orbit around Jupiter to study that planets famous red spot. Jupiter rotates once every 9.84 h. Use the data of Table 13.2 to find the altitude of the satellite above the surface of the planet.arrow_forwardEstimate the gravitational force between two sumo wrestlers, with masses 220 kg and 240 kg, when they are embraced and their centers are 1.2 m apart.arrow_forwardA satellite of mass 16.7 kg in geosynchronous orbit at an altitude of 3.58 104 km above the Earths surface remains above the same spot on the Earth. Assume its orbit is circular. Find the magnitude of the gravitational force exerted by the Earth on the satellite. Hint: The answer is not 163 N.arrow_forward
- The mean diameter of the planet Mercury is 4.88106m , and the acceleration due to gravity at its surface is 3.78m/s2 . Estimate the mass of this planet.arrow_forwardFind the speed needed to escape from the solar system starting from the surface of Earth. Assume there are no other bodies involved and do not account for the fact that Earth is moving in its orbit. [Hint: Equation 13.6 does not apply. Use Equation 13.5 and include the potential energy of both Earth and the Sun. Substituting the values for Earth’s mass and radius directly into Equation 13.6, we obtain vesc=2GMR=2(6.67 10 11Nm2/kg2)(5.96 10 24kg)(6.37 106m)=1.12104m/s That is about 11 km/s or 25,000 mph. To escape the Sun, starting from Earth’s orbit, we use R=RES=1.501011m and MSum=1.991030kg . The result is vesc=4.21104m/s or about 42 km/s. We have 12mvesc2GMmR=12m02GMm=0 Solving for the escape velocity,arrow_forwardWhat is the gravitational acceleration close to the surface of a planet with a mass of 2ME and radius of 2RE where ME, and RE are the mass and radius of Earth, respectively? Answer as a multiple of g, the magnitude of the gravitational acceleration near Earths surface. (See Section 7.5.)arrow_forward
- (II) Given that the acceleration of gravity at the surface of Mars is 0.38 of what it is on Earth, and that Mars’ radius is 3400 km, determine the mass of Marsarrow_forwardExample 5.20 Conical Pendulum page 152 A pendulum bob of mass m moves in a horizontal circle of radius R The length of the pendulum wire is L and makes an angle of beta with respect to the vertical Find the tension F in the wire and the period T of the pendulumarrow_forwardTwo objects attract each other with a gravitational force of magnitude 1.00E-8 N when separated by 20.0 cm. If the total mass of the two objects is 5.00 kg, what is the mass of each?arrow_forward
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