Tuesday
October 21, 2014

Homework Help: science(check answers)

Posted by matt on Monday, March 31, 2014 at 5:01pm.

1.---please help
2.C
3.D
4.C
5.A
6.C
7.---please help


1.An advantage of using an electromagnet,shown on the crane in the image below,instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turnd on and off.

A.true
B.false


2.Imagine two artificial satellites orbiting Earth at the same distance. One satellite has a greater mass than the other one. Which of the following would be true about their motion?

A. The satellite with the greater mass is being pulled toward Earth with less of a force than the other satellite.
B. The satellite with the greater mass is being pulled toward Earth with a greater force than the other satellite.
C. The two satellites are being pulled with equal force by the moon.
D. The two satellites are being pulled toward Earth with equal force.


3.Imagine two artificial satellites with equal masses orbiting Earth. One satellite is orbiting closer to Earth than the other satellite. Which of the following would be true about their motions?

A. The satellite closer to Earth will be pulled toward Earth with the same gravitational pull as the other satellite.
B. The satellite closer to Earth will be pulled toward Earth with less gravitational pull than the other satellite.
C. Both satellites will be pulled with equal force toward the moon.
D. The satellite closer to Earth will be pulled toward Earth with more gravitational pull than the other satellite.


4.An engineer discovered that a TV set was receiving too much voltage to work properly. Which of the following circuit parts should the engineer add to make the TV set work properly?

A. switch
B. insulator
C. resistor
D. conductor


5.A windmill is an example of a

A. generator.
B. resistor.
C. insulator.
D. motor


6.How will resistance change when the voltage increases in an electric circuit if the current remains constant?

A. It will decrease.
B. It will stay the same.
C. It will increase.
D. It will decrease, then increase.

7
A student made an electromagnet using a battery, electrical tape, and metal wire. She wanted to see what the affect would be if she switched the side of the battery she connected each end of the wire to. Which of the following would be a correct conclusion?

A. Switching the side of the battery each end of the wire is connected to will have no observable affect.
B. Switching the side of the battery each end of the wire is connected to will increase the electromagnetic force of the wire.
C. Switching the side of the battery each end of the wire is connected to will decrease the electromagnetic force of the wire.
D. Switching the side of the battery each end of the wire is connected to will reverse the magnetic poles of the wire.

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