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

Answered
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?

Answered
4 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

When using the lens equation, a real image is

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
1 Aug 2019

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

Answered
30 Jul 2019

A particle known as a pion lives for a short time before breakingapart into other particles. Suppose a pion is moving at a speed of0.990c, and an observer who is stationary in a laboratory measuresthe pion's lifetime to be 3.2 x 10-8 s. (a) What is the lifetimeaccording to a hypothetical person who is riding along with thepion? (b) According to this hypothetical person, how far does thelaboratory move before the pion breaks apart?


At most, how many bright fringes can be formed on either side ofthe central bright fringe when light of wavelength 603 nm falls ona double slit whose slit separation is 4.17 x 10-6 m?

Answered
26 Jul 2019