# A man wants to move some heavy boxes up to the loft in his barn

• HappyFlower
In summary, the conversation discusses a man's attempt to move heavy boxes up a ramp using a 2.25 Horsepower motor. The ramp has an incline of 36.2 degrees and a coefficient of kinetic friction of .381. The question is what is the heaviest box the man can pull up the ramp at a constant speed of 76.5 cm/s. The solution involves using an equation relating power to speed.
HappyFlower

## Homework Statement

A man wants to move some heavy boxes up to the loft in his barn. He uses a 2.25 Horsepower motor to pull the boxes a distance of 9.35 meters up a ramp inclined at an angle of 36.2 degrees with respect to horizontal. The boxes have a coefficient of kinetic friction .381 as they slide along the ramp.
a) What is the heaviest box the man can pull up the incline with his motor at a constant speed of 76.5 cm/s?
This question has more parts but this is the only part I have trouble with.

## The Attempt at a Solution

I made the picture now i am lost on where to go to find the heaviest box.

#### Attachments

• Table.PNG
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What have you learned about power? How about a relevant equation relating power to speed?

rg0ldberg and HappyFlower
kuruman said:
What have you learned about power? How about a relevant equation relating power to speed?
That helped a lot didnt know where my mind was... thank you!

## 1. How can the man safely move the heavy boxes up to the loft?

The safest way for the man to move the heavy boxes up to the loft is to use a pulley system with a sturdy rope or cable. This will distribute the weight of the boxes evenly and make it easier for him to lift them.

## 2. What should the man do if the boxes are too heavy for him to lift?

If the boxes are too heavy for the man to lift on his own, he should seek help from another person or use a dolly to transport the boxes up to the loft. It is important to avoid straining or injuring oneself when moving heavy objects.

## 3. Are there any safety precautions the man should take when moving the heavy boxes?

Yes, the man should make sure the path to the loft is clear of any obstacles and that the area is well lit. He should also wear appropriate protective gear, such as gloves and sturdy shoes, to prevent any injuries while lifting and carrying the boxes.

## 4. What is the maximum weight the man should attempt to lift on his own?

The maximum weight a person should attempt to lift on their own depends on their strength and physical abilities. As a general rule, it is recommended to not lift more than 50 pounds without assistance. The man should assess his own abilities and ask for help if needed.

## 5. Is there a specific method the man should use to pack the boxes for easier lifting?

Yes, the man should try to distribute the weight of the boxes evenly and avoid overpacking them. He should also make sure the boxes are securely closed and any loose items are properly secured to prevent them from shifting during the lifting process.

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