Bob weighs 80 pounds. He ran up the steps which rose 14 feet. Fred weighs 110 pounds. He ran up the same steps as Bob. If both boys reached the top of the 14-foot stairs at the same time, which boy had the greatest horsepower?

Answers

Answer 1

Answer: Bob gained (80lbs x 14ft) = 1120 ft-lbs of energy.

Fred gained (110lbs x 14ft) = 1540 ft-lbs of energy

Since they both took the same amount of time, Fred's power (rate
of doing work) was greater than Bob's power (rate of doing work).

Answer 2

Answer:

Answer:

Bob gained (80lbs x 14ft) = 1120 ft-lbs of energy.

Fred gained (110lbs x 14ft) = 1540 ft-lbs of energy

Since they both took the same amount of time, Fred's power (rate

of doing work) was greater than Bob's power (rate of doing work).

Explanation:

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Which of the following could be a potential safety hazard of indoor recreation?a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS
d. a liquid spill on the floor that was not cleaned

Answers

d. a liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation

A liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation.

NOT:

a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS

Answer:

THE ANSWER IS D

Explanation:

A170 g hockey puck sliding at 25 m/s slows to a speed of 10 m/s in a distance of
7.5 m. Determine the force of friction
causing the puck to slow.

Answers

From 2nd Newton Law:
F=ma
m=170g=0,17kg
Acceleration using kinematic equations:
vk²=vp²+2aΔd
vp-initial velocity=25m/s
vk-ending velocity=10m/s
Δd-distance
a= $( vk^(2)- vp^(2) )/(2Δd)$
a= $(100-625)/(2*7,5)$
a= $(-525)/(15)$
a=-35 $(m)/(s)$ ²
F=0,17kg*(-35m/s²)=-5,95N

The diagram shows two bar magnets. They are cut along the dashed line, and then the two marked ends are placed near each other. Which statement best explains how the pieces will react?

A) The pieces will repel because the cut end of the top magnet is not a magnetic pole.

B) The pieces will attract because the cut end of the top magnet is not a magnetic pole.

C) The pieces will repel because the cut end of the top magnet is a south pole.

D) The pieces will attract because the cut end of the top magnet is a north pole.

Answers

The answer to this problem is "OPTION C" i.e. The pieces will repel because the cut end of the top magnet is a south pole.

A magnet as a collection of tiny magnets, called magnetic domains. Each of these domain reinforces the magnetic fields of the other domains and hence the net magnetic field of magnet is generated. Each one of these domains have a tiny north and south pole. If you cut a magnet in half (along the line suggested in the problem), the newly cut faces will become the new north or south poles of the divided parts.

Answer:

Explanation:

The Earth's _____is what gives us day and night

1. Orbit
2. Rotation
3.Revolution

Answers

Answer: 2nd option, Rotation

I hope this helps, and Stay Safe! :)

Answer:

rotation

Explanation:

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A 2.50 × 105 W motor is used for 26.4 s to pull a boat straight toward shore. How far does the boat move toward shore if a force of 4.20 × 104 N is applied by the motor?

Answers

The power of the motor is
2.50x10⁵ W
or
2.50x10⁵ N m/s

The time it takes to pull the boat is
26.4 s

The force applied is
4.20x10⁴ N

The distance traveled by the boat is
2.50x10⁵ N m /s (26.4 s) / (4.20x10⁴ N)
= 157.14 m

Answer:

157 m

Explanation:

right on ed2020

What is refractive index?

Answers

The refractive index of a substance is the ratio . . .

(speed of light in vacuum) divided by (speed of light in the substance) .

So the speed of light in a substance is

(299,792,458 meters per sec) divided by (the refractive index of the substance).

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