osteoblogda
2021-12-18
Answered

Satellite A orbits a planet with a speed of 10,000 m/s. Satellite B is twice as massive as satellite A and orbits at twice the distance from the center of the planet. What is the speed of satellite B? Assume that both orbits are circular.

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asked 2021-08-17

Jones figures that the total number of thousands of miles that a used auto can be driven before it would need to be junked is an exponential random variable with parameter

Smith has a used car that he claims has been driven only 10,000 miles.

If Jones purchases the car, what is the probability that she would get at least 20,000 additional miles out of it?

Repeat under the assumption that the lifetime mileage of the car is not exponentially distributed but rather is (in thousands of miles) uniformly distributed over (0, 40).

asked 2021-02-11

A 95.0kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.80 $\frac{m}{{s}^{2}}$ , (b) moving upward at a constant speed and (c) accelerating downward with an acceleration of 1.30 $\frac{m}{{s}^{2}}$ ?

asked 2021-03-07

When a car stops suddenly, the passengers tend to move forward relative to their seats. Why? When a car makes a sharp turn, the passengers tend to slide to one side of the car. Why?

asked 2020-11-01

As part of your work out, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when u push the platform, you compress the springs. You do 80.0G of work when u compress the springs 0.200m from their uncompressed length.

a) What magnitude of force must u apply to hold the platform in this position?

b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?

a) What magnitude of force must u apply to hold the platform in this position?

b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?

asked 2021-05-13

A rectangular barge, 5 m long and 2 m wide, floats in freshwater.

a. Find how much deeper it floatswhen its load is a 400 kg horse.

b. If the barge can only be pushed15 cm deeper into the water before water overflows tosink it, how many 400 kg horses can it carry?

a. Find how much deeper it floatswhen its load is a 400 kg horse.

b. If the barge can only be pushed15 cm deeper into the water before water overflows tosink it, how many 400 kg horses can it carry?

asked 2020-10-23

In the vertical jump, an athlete starts from a crouch andjumps upward to reach as high as possible. Even the best athletesspend little more than 1.00 s in the air (their "hang time"). Treatthe athlete as a particle and let be his maximum height above the floor. Toexplain why he seems to hang in the air, calculate the ratio of thetime he is above /2 moving up to the time it takes him to go from thefloor to that height. You may ignore air resistance.

I think I have to use the formula

asked 2021-10-04

Analysis of a compound indicates the percent composition 42.07% Na, 18.89% P, and 39.04% O. Determine its empirical formula.