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A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity?

Select one:

An astronaut goes out for a "space-walk" at a distance above the Earth equal to the radius of the Earth. What is her acceleration due to gravity? Select one:

The acceleration of gravity on the Moon is one-sixth what it is on Earth. The radius of the Moon is one-fourth that of the Earth. What is the Moon's mass compared to the Earth's? Select one:

What is the gravitational force on a 70-kg person standing on the Earth, due to the Moon? The mass of the Moon is 7.36 x 10²² kg and the distance to the Moon is 3.82X10⁸m. Select one:

A metal sphere of radius 10 cm carries a charge of +2.0 （含图）C. What is the magnitude of the electric field 5.0 cm from the sphere's surface?

Select one:

A point charge of +Q is placed at the centroid of an equilateral triangle. When a second charge of +Q is placed at one of the triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?

（含图）

Select one:

Consider the diagram below:

（含图）

Two parallel plates are separated in vacuum by 0.200 m. the top plate. Has a potential of 400 V and the bottom plate has a potential of − 600 V. An alpha particle is released from the top plate. The acceleration of the alpha particle between the plates is

Consider the diagram below:

（含图）

Two parallel plates are separated in vacuum by 0.200 m. the top plate. Has a potential of 400 V and the bottom plate has a potential of − 600 V. An alpha particle is released from the top plate. The force experienced by the alpha particle between the plates is

Select one:

Is it possible to have a zero electric field value between two positive charges along the line joining the two charges?

Select one:

What is the charge on 1 kg of protons?

Select one:

（含图）

What current flows from the battery in Figure?

Select one:

（含图）

What is the potential drop from point A to point B in Figure?

Select one:

（含图）

What is the potential of point D relative to point C in Figure?

Select one:

A 3.0- ohm resistor is connected in parallel with a 6.0- ohm resistor. This combination is connected in series with a 4.0- ohm resistor. The resistors are connected to a 12-volt battery. How much power is dissipated in the 3.0- ohm resistor? Select one:

If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide Select one:

If you connect two identical storage batteries together in series ("+" to "-" to "+" to "-"), and place them in a circuit, the combination will provide Select one:

A galvanometer with a coil resistance of 40.0 Ω deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V? Select one:

Consider the diagram below:

（含图）

A uniform wooden beam of weight 200 N is supported horizontally by a vertical wall and a strong cable. An object of weight 1000 N is attached to the end of the beam.

Calculate the tension in the cable.

Select one:

Consider the diagram below:

（含图）

A uniform wooden beam of weight 200 N is supported horizontally by a vertical wall and a strong cable. An object of weight 1000 N is attached to the end of the beam.

Calculate the vertical component of the force exerted by the wall on the beam.

Select one:

Consider the diagram below:

（含图）

A uniform wooden beam of weight 200 N is supported horizontally by a vertical wall and a strong cable. An object of weight 1000 N is attached to the end of the beam. Calculate the force exerted by the beam on the wall.

Select one:

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