# Homework Help for Physics (page 2)

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A car traveling at 50 km/h hits a bridge abutment. A passenger inthe car moves forward a distance of 59 cm (with respect to theroad) while being brought to rest by an inflated air bag. Whatmagnitude of force (assumed constant) acts on the passenger's uppertorso, which has a mass of 46 kg?
_________ N

6 Aug 2019

Satellites feel the gravitational pull of the earth. They remainin orbit because of their velocity, which acts to counteractgravity. (The satellite wants to fly out in a straight line, butgravity forces it to curve towards the earth.) Consider acommunications satellite that needs to be 39000 km above theEarth's surface.

(a) Assuming the satellite travels in a perfect circle, what is theradius of the satellite's travel. (The radius of the earth is 6375km.)

(b) At the satellite's altitude, the acceleration of gravity is0.193 m/s2. What is the magnitude of the tangential velocity thatthe satellite must have to remain in orbit?

(c) How much time will the satellite take to orbit the earth?

4 Aug 2019

what visible wavelengths of light are strongly reflected from a 390-nm-thick soap bubble?

1 Aug 2019

an object is 1.0 cm tall and its erect image is 4.0 cm tall. what is the exact magnification?

1 Aug 2019

what is the magnitude of the gravitational force acting on the earth due to the sun?

1 Aug 2019

When using the lens equation, a real image is

1 Aug 2019

on which of the following does the moment of inertia of an object depend?

1 Aug 2019

a particle in uniform circular motion requires a net force acting in what direction?

1 Aug 2019

which of the following statements is not one of newton's laws of motion?

1 Aug 2019

what is the shape of the worldline of an object at rest, when time is plotted on the vertical axis?

1 Aug 2019

why does lifting one end of the track lead to constant acceleration

1 Aug 2019

an object is 1.0 cm tall and its inverted image is 3.0 cm tall. what is the exact magnification?

1 Aug 2019

a particle traveling around a circle at constant speed will not experience an acceleration.

1 Aug 2019

find the speed of sound in air at 30 degrees celsius.