You lift a cat with a force of 40 N up to a table that is 0.5 m high. How much work did you do?
A. 80 J
B. 10 J
C. 40 J
D. 20 J
During a skydiving landing, a parachute deploys from the back of the diver as it taxis back down to the Earth. The parachute helps the diver slow down before landing. How does the parachute help during this process?
A.It increases friction by air resistance.
B.It increases the weight of the diver.
C.It increases heat transfer by radiation.
D.It increases the potential energy of the diver.
If the input force of moving a box up a ramp is 10N and the output force is 30N, what is the mechanical advantage?
A. .33
B. 3
C. 30
D.300
Which of the following scenarios would cause a decrease in magnetic potential energy?
A.A North and a South pole attracting
B.Pulling a North and a South pole apart
C.Forcing two North poles together
THANKS!
The parachute slows the jumper down by friction with the air.
The first one is a force up of 40 Newtons moving up .5 meters
40 * .5 = 20 Joules
yes, mechanical advantage 3 but question is poorly worded
The last one is like if you jump off a table toward the center of the earth your Potential energy goes down. If the magnets pull together they will hit fast like you hitting the ground. Their potential energy goes down while their kinetic energy goes up if they attract each other. So it is A
Ah, where is your attempt to do these?
by the way, the first one is trivial. work = force times distance moved in direction of the force. Force in Newtons * distance in meters ---> Joules
I don't understand the first one at all but are the answers for the second third and forth are
D
B
B
are these right?
thank you soooo much!!!
You are welcome.
To find the work done in lifting the cat, we can use the formula:
Work = Force × Distance
In this case, the force is 40 N (the force you applied to lift the cat) and the distance is 0.5 m (the height of the table). Plugging in these values, we get:
Work = 40 N × 0.5 m = 20 J
So the correct answer is D. 20 J.
Now, to understand how the parachute helps during a skydiving landing, we need to consider the forces involved. When the parachute deploys, it increases the surface area facing the oncoming air, creating a larger air resistance force. This increased air resistance acts opposite to the direction of motion and helps slow down the diver's descent.
Therefore, the correct answer is A. It increases friction by air resistance.
To calculate the mechanical advantage in moving a box up a ramp, we can use the formula:
Mechanical Advantage = Output Force / Input Force
In this case, the output force is 30 N and the input force is 10 N. Plugging in these values, we get:
Mechanical Advantage = 30 N / 10 N = 3
So the correct answer is B. 3.
Finally, to determine which scenario would cause a decrease in magnetic potential energy, we need to consider the nature of magnetic poles. Like poles repel each other, while opposite poles attract each other.
Therefore, the correct answer is B. Pulling a North and a South pole apart. When the poles are pulled apart, they move away from each other, reducing the potential energy stored in their magnetic field.
Hope this helps!