Tag Archives: Physics

## Force and Velocity

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A 2.0 kg body is acted on by a 10-N force. If the body is initially at rest, what will be its velocity after 5 seconds?

## Penny Toss

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A penny is thrown horizontally with an initial speed of 20 m/s. How far will it drop in 5 seconds? (Ignore air resistance).

## Frictionless Roof

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Which of the following statements accurately describes the magnitude of the normal force (N) on a sled sliding down a frictionless roof that is inclined at x degrees with the horizontal?

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Radioactive isotopes can sometimes emit or radiation, which can be very dangerous to people. However, they can be very useful for medical purposes, so long as the proper quantity is used. If the safety standard for a radioactive injection of phosphorus requires that less than 0.01g remains in the body after 90 days after the injection, what is the maximum initial dose? The half-life of phosphorous is 14.29 days.

## Airplanes

A baby can easily surpass 100 decibels. Which of the following part of a sound wave is increased to create such a loud cry?

## Flu Season Physics

A virus is sneezed out at a rate of 45 m/s. It travels through the air and makes contact with a stationary person nearby. The stationary person appears unaffected. Which of the following statements is always true?

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Photo attributed to ScientificRelevance.

## That’s Why They Wear Helmets

A human skull can withstand 100 kPa before fracturing. A baseball, with an impact area 0.003 m2 and a weight of 0.15 kg, is launched from a pitching machine, a distance of 20 meters, towards a skull. How long would it take for the baseball to travel if the skull was cracked?

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## Golden Romance

Your significant other gave you a watch for Valentine ’s Day, and tells you it’s made of “pure gold” (density of gold = 19,000 kg/m3). Being a mistrusting boy/girl friend, you decide to find out whether this is true. Later that day, you place the watch on a spring scale and lower it into water. The weight on the scale reads 10N out of water and 6N when completely submerged. Is the watch really made out of pure gold?

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## Burn Out

A patient in a wheelchair notices his wheels are sometimes warm after he travels. If the patient traverses the same distance across the same material surface, which situation would his wheels be the hottest after completion?

## Heat Transfer Due to Conduction

The human body has an average temperature of 37°C. A person, with a fever of 40°C, would like to know what will be the temperature of her skin in an ice bath, after reaching a steady state. Which of the following equations can be used to create an analogous formula for heat transfer due to conduction?