# Physics

A non-rotating spherical planet with no atmosphere has a mass M and radius R. A particle is fired off from the surface with a speed equal to 3/4 the escape speed. Calculate the farthest distance it reaches (measured from the center of the planet) if it is fired tangentially. I know how solve it if fired radially, but I don't know how to do it if the particle is fired tangentially.

1. 👍
2. 👎
3. 👁
1. If fired radically, there is some initial angular momentum, which has to be conserved. At the end, it also has to be conserved, which means it there is some angular KEnergy. So calculate this initial rotational KE, and in the end, it will subtract from the final gravitational PE, you can calculate the distance reached.

1. 👍
2. 👎
👤
bobpursley
2. Darn it, "If fired tangentally, ..."

Correct the above response.

1. 👍
2. 👎
👤
bobpursley

## Similar Questions

1. ### science

if all of the following imaginary planets were the same distance from the sun, which would experience the strongest force of gravity due to the sun? planet a: mass 3,500 kg planet b: mass 50,000 kg planet c: mass 750 kg planet d:

2. ### physics

A 3.3 kg mass weighs 30.03 N on the surface of a planet similar to Earth. The radius of this planet is roughly 7.4 × 106 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6.67259 ×

3. ### Science

The atmospheres of the planets in our solar system differ in their physical compositions. Which planet would you expect to have the thickest atmosphere? a planet with a hot atmosphere and strong gravity a planet with a cold

4. ### astronomy

Rank the following hypothetical planets -- all of which have the same total mass and same radius -- from lowest moment of inertia to highest moment of inertia: 1) A uniform sphere of mixed up rock and iron 2) A rocky planet with

1. ### Physics

A mystery planet in another part of the galaxy has an acceleration due to gravity of 5.00 m/s^2. If the radius of this planet is 2.00 x 10^6 m, what is the mass of the mystery planet?

2. ### Help Mr Oobleck

If all of the following imaginary planets were the same distance from the sun, which would experience the strongest force of gravity due to the sun? Planet Mass (kg) Planet A 3,500 kg Planet B 50,000 kg Planet C 750 kg Planet D

3. ### Science

The atmospheres of the planets in our solar system differ in their physical compositions. Which planet would you expect to have the thickest atmosphere? a planet with a hot atmosphere and strong gravity a planet with a cold

4. ### mit physics

A spherical non-rotating planet (with no atmosphere) has mass m 1= 6 ×10 24 kg and radius r 1= 9000 km. A projectile of mass m 2≪ m 1 is fired from the surface of the planet at a point A with a speed v A at an angle α=30 ∘

1. ### Science

A model shows that the moon has grown to twice its size, yet it has remained in the same place. In one to two sentences, explain how this would impact the gravity between Earth and the moon.(2 points)

2. ### physics

An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, what happens to the mass and wieght of the object?

3. ### Physics

While visiting Planet Physics, you toss a rock straight up at 15 and catch it 2.4 later. While you visit the surface, your cruise ship orbits at an altitude equal to the planet's radius every 240 min . What is the mass of Planet

4. ### Physics

A non-rotating spherical planet with no atmosphere has a mass M and radius R. A particle is fired off from the surface with a speed equal to 3/4 the escape speed. Calculate the farthest distance it reaches (measured from the