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2 years ago

12

Which has more kinetic energy, a basketball rolling at a walking pace or a baseball rolling at the pace of someone running? How

could we find out ?

1 answer:

icang [17]2 years ago

8 0

Answer:

answer 2 because the baseball has less mass then the 1st one

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Which most likely indicates a chemical change has occurred?

Marta_Voda [28]

A green liquid becoming a red liquid

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2 years ago

An Asian-American pre-med college student is seeking counseling on campus. He appears to be excessively concerned with failing h

Irina-Kira [14]

Answer:abc defg hijk lmnop qrs tuv wx y and z

Explanation: now i know my abc's

4 0

2 years ago

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizont

Rashid [163]

Answer:

47.48 m

Explanation:

The horizontal range of an object can be estimated using the equation below:

$S_{x} =$ $\frac{v^{2}*sin (2\alpha)}{g}$

For the maximum horizontal range to occur, the angle $\alpha$ is 45°. Then, the horizontal range will be:

$S_{x}$ = $\frac{v^{2}*sin 90}{g} = \frac{v^{2}}{g}$

In addition, the velocity (v) can be estimated using the equation below:

v = gt/2

Therefore, the maximum horizontal range is:

$S_{x} = \frac{(gt/2)^{2}}{g}$ = (9.81*4.4/2)^2 / 9.81 = 47.48 m

6 0

3 years ago

Based on the type of medium, what can you assume about the speed of sound in glass?

adelina 88 [10]

Answer:

"It will be more than the speed of sound waves in air at 20*C and water at 20*C."

Explanation:

Speed of sound in a medium depends upon the density and elasticity of the medium.

If the elasticity of a medium is greater and the density of that medium is lower, sound will travel faster. Although density is also a factor but the major factor is Elasticity.

Hence, sound travel faster in solids than in liquids and even slower in gases due to elasticity difference.

$Speed of sound = V = \sqrt{\frac{Elasticity}{Density} }$

That is why the speed of sound in glass will be more than the speed of sound waves in air at 20*C and water at 20*C.

5 0

2 years ago

A car travels due east with a speed of 38.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth

DiKsa [7]

Answer: 116.926 km/h

Explanation:

To solve this we need to analise the relation between the car and the Raindrops. The cars moves on the horizontal plane with a constant velocity.

Car's Velocity (Vc) = 38 km/h

The rain is falling perpedincular to the horizontal on the Y-axis. We dont know the velocity.

However, the rain's traces on the side windows makes an angle of 72.0° degrees. ∅ = 72°

There is a relation between this angle and the two velocities. If the car was on rest, we will see that the angle is equal to 90° because the rain is falling perpendicular. In the other end, a static object next to a moving car shows a horizontal trace, so we can use a trigonometric relation on this case.

The following equation can be use to relate the angle and the two vectors.

Tangent (∅) = Opposite (o) / adjacent (a)

Where the Opposite will be the Rain's Vector that define its velocity and the adjacent will be the Car's Velocity Vector.

Tan(72°) = Rain's Velocity / Car's Velocity

We can searching for the Rain's Velocity

Tan(72°) * Vc = Rain's Velocity

Rain's Velocity = 116.926 km/h

3 0

3 years ago