1. A box of cleaning supplies weighs 15 N. If the box is lifted a distance of 0.60 m, how much work is done? (1 point)
0.040 J
9 J
14 J
25 J
2. To chop wood, you apply 50.0 N of force to an ax. The ax applies 600.0 N of force to the wood. What is the mechanical advantage of the ax?
(1 point)
650.0
8.3
12.0
0.0833
3. You do 185 J of work pulling a cart up a ramp. If the ramp does 153 J of work, what is the efficiency of the ramp?
(1 point)
82.7 percent
121.0 percent 32.0 percent
338.0 percent
4. Remy noticed that after oiling his skateboard wheels, it was easier to reach the speeds he needed to perform tricks. How did the oil help?
(1 point)
The oil reduced friction between the moving parts of the skateboard.
The oil increased friction between the moving parts of the skateboard.
The oil reduced friction between the skateboard wheels and the ground.
The oil increased friction between the skateboard wheels and the ground.
5. When building a house, which of the following is a simple machine that a construction worker would use?
(1 point)
plywood
safety hat cement pulley
I finished it and got a 100% the answers are:
1.B
2.C
3.A
4.A
5.D
Got a 100% thanks @21 pilots
B
C
A
A
D
PsyDAG honestly people come here for answers nobody ever gives explanations on these kinds of websites and you arrived early before anyone gave answers so your just mad. i understand the pain with no answers.
21 pilots is right
1. To find the work done, we can use the formula:
Work = Force × Distance
In this case, the force is the weight of the box, which is 15 N, and the distance is 0.60 m.
So, Work = 15 N × 0.60 m = 9 J
Therefore, the amount of work done is 9 J.
2. The mechanical advantage (MA) of a machine is defined as the ratio of the output force to the input force.
In this case, the input force is 50.0 N and the output force is 600.0 N.
So, MA = Output Force ÷ Input Force = 600.0 N ÷ 50.0 N = 12.0
Therefore, the mechanical advantage of the ax is 12.0.
3. Efficiency is the ratio of the useful work output of a machine to the total work input.
In this case, the useful work output is 153 J and the total work input is 185 J.
So, Efficiency = (Useful Work Output ÷ Total Work Input) × 100
Efficiency = (153 J ÷ 185 J) × 100 ≈ 82.7 percent
Therefore, the efficiency of the ramp is approximately 82.7 percent.
4. The oil helps by reducing friction between the moving parts of the skateboard.
Friction is a force that opposes motion, and by reducing friction, the oil allows the skateboard wheels to move more freely. This makes it easier for Remy to reach the speeds he needs to perform tricks.
Therefore, the oil reduces friction between the moving parts of the skateboard.
5. Out of the options listed, a pulley is a simple machine that a construction worker would use when building a house.
A pulley is a wheel with a grooved rim that is used to change the direction or magnitude of a force. Construction workers often use pulleys to lift heavy objects, such as building materials, to different heights.
Therefore, a pulley is a simple machine that a construction worker would use.
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.
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