17. Two masses are separated by a distance d. If I double the mass of one of the masses and then double the distance, how will the new gravitational force compare to the original? * O a. Equal to the original O b. 1/4 of the original O c. 1/2 of the original O d. Double the original

17. Two masses are separated by a distance d. If I double the mass of one of the masses and then double the distance, how will the new gravitational force compare to the original? * O a. Equal to the original O b. 1/4 of the original O c. 1/2 of the original O d. Double the original

Name: d. A large force produces a large change in the object's momentum onl
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Description: d. A large force produces a large change in the object's momentum only if the force isapplied over a short time interval.17. Two masses are separated by a distance d. If I double the mass of one of themasses and then double the distance, how will th

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter6: Uniform Circular Motion And Gravitation

Section: Chapter Questions

Problem 48PE: Integrated Concepts Space debris left from old satellites and their launchers is becoming a hazard...

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Integrated Concepts A large rocket has a mass of 2.00106 kg at takeoff, and its engines produce a thrust of 3.50107 N. (a) Find its initial acceleration if it takes off vertically. (b) How long does it take to reach a velocity of 120 km/h straight up, assuming constant mass and thrust? (c) In reality, the mass of a rocket decreases significantly as its fuel is consumed. Describe qualitatively how this affects the acceleration and time for this motion.
The Sun produces energy at a rate of 4.001026 W by the fusion of hydrogen. (a) How many kilograms of hydrogen undergo fusion each second? (b) If the Sun is 90.0% hydrogen and half of this can undergo fusion before the Sun changes character, how long could it produce energy at its current rate? (c) How many kilograms of mass is the Sun losing per second? (d) What fraction of its mass will it have lost in the time found in part (b)?
In Section 2.4, we computed the force needed to accelerate a 1,000-kg car from 0 to 27 m/s in 10 s. Compute the force using the alternate form of Newton’s second law. The change in momentum is the car’s momentum when traveling 27 m/s minus its momentum when going 0 m/s.
The velocity of a 10-kg object is given by v=5t2i(7t+2t3)j, where if t is in seconds, then v will be in meters per second. a. What is the net force on the object as a function of time? b. What is the momentum of the object when t = 15.0 s?
According to the National Academy of Sciences, the Earths surface temperature has risen about 1F since 1900. There is evidence that this climate change may be due to human activity. The organizers of World Jump Day argue that if the Earth were in a slightly larger orbit, we could avoid global warming and climate change. They propose that we move the Earth into this new orbit by jumping. The idea is to get people in a particular time zone to jump together. The hope is to have 600 million people jump in a 24-hour period. Lets see if it will work. Consider the Earth and its inhabitants to make up the system. a. Estimate the number of people in your time zone. Assume they all decide to jump at the same time; estimate the total mass of the jumpers. b. What is the net external force on the Earthjumpers system? c. Assume the jumpers use high-tech Flybar pogo sticks (Fig. P8.32), which allow them to jump 6 ft. What is the displacement of the Earth as a result of their jump? d. What happens to the Earth when the jumpers land?
To calculate the momentum of an object, which properties of an object do you need to know?
Asteroid Toutatis passed near Earth in 2006 at four times the distance to our Moon. This was the closest approach we will have until 2060. If if has mass of 5.01013kg , what force did it exert on Earth at its closest approach?
Astronauts in orbit are apparently weightless. This means that a clever method of measuring the mass of astronauts is needed to monitor their mass gains or losses, and adjust their diet. One way to do this is to exert a known force on an astronaut and measure the acceleration produced. Suppose a net external force of 50.0 N is exerted, and an astronaut’s acceleration is measured to be 0.893m/s2 . (a) Calculate her mass. (b) By exerting a force on the astronaut, the vehicle in which she orbits experiences an equal and opposite force. Use this knowledge to find an equation for the acceleration of the system (astronaut and spaceship) that would be measured by a nearby observer. (c) Discuss how this would affect the measurement of the astronaut’s acceleration. Propose a method by which recoil of the vehicle is avoided.
Hi there! :) It's sorta a lenghty question, Once the first stage of a rocket burns out, it separates and falls back to Earth. Before the second stage starts burning, the rocket slows down at a rate of 13 m/s2 [DOWN] for a short time. If the rocket slows from 1200 m/s [up] over a period of 4.8 seconds, what is the speed of the rocket after this deceleration? I've attatched a photo here that goes with the question :) Thanks so much!
7. Is there a change in mass, time or length at normal speeds of say 110 km/h? Explain
Integrated Concepts - Space debris left from old satellites and their launchers is becoming a hazard to other satellites. (a) Calculate the speed of a satellite in an orbit 900 km above Earth’s surface. (b) Suppose a loose rivet is in an orbit of the same radius that intersects the satellite’s orbit at an angle of relative to Earth. What is the velocity of the rivet relative to the satellite just before striking it? (c) Given the rivet is 3.00 mm in size, how long will its collision with the satellite last? (d) If its mass is 0.500 g, what is the average force it exerts on the satellite? (e) How much energy in joules is generated by the collision? (The satellite’s velocity does not change appreciably, because its mass is much greater than the rivet’s.)
Two rocks of masses 5kg and 10kg are dropped off a cliff at the same time. 1. Which rock will hit the ground first? a)5kg rock b)10kg rock c) they will hit at the same time Justify your answer. 2. One of the rocks is now dropped from twice the original height (2H). How does the time it takes to hit the ground (t2) compare to the original time (t1)? a) t2 = 2t1 b) t2 <2t1 c) t2 > 2t1 Justify your answer.