CONCEPTUAL PHYSICS LL FD
12th Edition
ISBN: 9780135745816
Author: Hewitt
Publisher: PEARSON
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Chapter 36, Problem 19RCQ
Is Newtonian physics adequate to get a rocket to the Moon?
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Chapter 36 Solutions
CONCEPTUAL PHYSICS LL FD
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- One way astrophysicists have identifi ed “extrasolar” planets orbiting distant stars is by observing redshifts or blueshifts in the star’s spectrum due to the fact that he star and planet each revolve around their common center of mass. Consider a star the size of our sun (mass 1.99 x 1030 kg), with a planet the size of Jupiter(1.90 x 1027 kg) in a circular orbit of radius 7.79 x 1011 m and a period of 11.9 years. (a) Find the speed of the star revolving around the system’s center of mass. (b) Assume that Earth is in the planet’s orbital plane, so that at one point in its orbit the star is moving directly toward Earth, and at the opposite point it moves directly away from Earth. How much is 550-nm light redshifted and blueshifted at those two extreme points?arrow_forwardWhat feature of electrodynamics made Einstein to propose a special theory of relativity?arrow_forwardA planet is discovered orbiting a distant star. The mass of theplanet is 40 times the mass of the Earth, and its radius is one-tenththe Earth’s radius. If a 2400-kg rocket has an escape velocity v onthe Earth, how does the escape speed of a 1200-kg rocket on theplanet compare with v?arrow_forward
- A probe of mass 100 kg is coasting through a dense gas cloud in deep space, where g = 0. There is drag from the gas cloud and it is modeled by the equation -0.6 v (N). If the probe entered the gas cloud with speed 1,555 m/s, how much time, in s, will it take for the probe's speed to be reduced to 15 percent of its initial velocity? (Please answer to the fourth decimal place - i.e 14.3225)arrow_forward(a) What is the change in energy of a 1000-kg payload taken from rest at the surface of Earth and placed at rest on the surface of the Moon? (b) What would be the answer if the payload were taken from the Moon’s surface to Earth? Is this a reasonable calculation of the energy needed to move a payload back and forth?arrow_forwardAn object of mass m is launched from a planet of mass M and radius R. a)Derive and enter an expression for the minimum launch speed needed for the object to escape gravity, i.e. to be able to just reach r = ∞. b)Calculate this minimum launch speed (called the escape speed), in meters per second, for a planet of mass M = 6 × 1023 kg and R = 76 × 104 km.arrow_forward
- How fast must a rocket travel relative to the earth so that time in the rocket "slows down" to quarter its rate as measured by earth-based observers? Express your answer in meters per second to three significant figures. Do present-day jet planes approach such speeds? Yes or Noarrow_forwardIf instead of a cannonball we were to launch a rocket, at what minimum speed will the rocket be able to escape Earth’s orbit?arrow_forwardProblem 7. Use Kepler's third law (and the reduced mass) to derive the time it will take two baseballs, initially at rest a meter apart in deep space, to hit each other due to gravitational attraction. The mass of a baseball is 145 grams. Ignore the diameter of the baseballs; i.e. assume they are point particles.arrow_forward
- B2arrow_forwardwhat features of electrodynamics made einstein to propose special theory of relativity?arrow_forwardwe added a 30 mg (that's 30 x 10-6 kg) mass to the upper wire and the laser spot on the scale dropped down from 24.2 cm at equilibrium to 22.9 cm with the mass on it. That change on the scale of 1.3 cm represents the effect of the gravitational force due to the weight of 30 mg. This calibrates the response of the balance to forces. What is the scale factor "b" such that FB = b y where FB is in micro-newtons (10-6 N) and y is the spot deflection on the scale in centimeters? Pick the answer closest to what you calculate using the scale readings 24.2 (equilibrium) and 22.9 (30 mg). 23.1 226 0.209 0.000226arrow_forward
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