3 years ago

Deb drives 120 miles in 2 hours. What is her average speed

Physics

1 answer:

vladimir2022 [97]3 years ago

7 0

60 miles an hour because 120÷2=60

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3 years ago

A gas hot water heater is 65% efficient. The energy output to heat the water is 2.3 kWh.

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Answer:

3.5 kWh

1.2 kWh are lost

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65=2.3/Ein*100

0.65=2.3/Ein

Ein=2.3/.65

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In which scenario does radiation occur? warming soup on a stove drying towels at the beach cooking eggs in boiling water warming

shepuryov [24]

Answer: drying towels at the beach.

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3 years ago

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A box is at rest on a ramp at an incline of 22°. The normal force on the box is 538 N.

fomenos

Answer: 580 N

Refer to attached figure.

The angle of inclination is 22 degrees

weight (gravitational force) acts downwards.

Normal force is a contact force which acts perpendicular to the point of contact.

The horizontal component (mg cos 22 ) balances the normal force and the vertical component balances the frictional force.

Gravitational force on an object = mg

The normal force $N= mg cos 22$

$\Rightarrow mg =\frac{N}{cos22}=\frac{538 N}{0.927}=580 N$

8 0

3 years ago

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