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3 years ago

Which object has the greatest amount of kinetic energy?

Physics

1 answer:

EleoNora [17]3 years ago

4 0

I think that the answer is A

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Which statement aboutſatmospheric pressure near Earth's surface is true?

Marizza181 [45]

Answer:

Option B) It decreases as someone moves away from earth's surface.

Explanation:

The atmospheric pressure at the surface of the earth is at maximum, it is seen that as we move away from the surface of the earth the pressure decreases. As on the top of mountains the atmospheric pressure is found to be low as compared to the surface of the earth.

It is assumed that the atmospheric pressure is caused due to hydrostatic measurements where the changes caused by weight of air are measured.

Also, it is observed that when there is an elevation, the atmospheric pressure decreases.

6 0

3 years ago

A metal wire of resistance R is cut into five equal pieces that are then placed together side by side to form a new cable with a

Alina [70]

Answer:

R / 25

Explanation:

Let the initial length of the wire is L and its resistance is R.

Now the length is cut into 5 equal parts.

The resistance of a wire is directly proportional to the length of the wire, thus, the resistance of each portion of the wire is R/5.

Now the five pieces are connected in parallel combination, the equivalent resistance is

$\frac{1}{R_{eq}}=\frac{5}{R}+\frac{5}{R}+\frac{5}{R}+\frac{5}{R}+\frac{5}{R}$

$R_{eq}=\frac{R}{25}$

Thus, the resistance of the new cable is R / 25.

8 0

3 years ago

What is the speed of a ball that is attached to a string and swings in a horizontal circle of radius 2.0 m with the central acce

Ira Lisetskai [31]

Answer:

5.48 m/s.

Explanation:

Use the formula a=v^2/r.

7 0

3 years ago

An unknown solution has a pH of 7. How would you classify this solution? acidic basic neutral There is not enough information t

Schach [20]

It would be a neutral,

The acidity of water is 7 as well

6 0

4 years ago

Read 2 more answers

What is the power involved in lifting a 10-kg object 1.0 m in 0.50 s?

Sedbober [7]

In this question, we know that mass= 10 kg = 10 x 1000 = 10,000 g
Distance = 1 m and Time = 0.5 s

Power = Force x Velocity
Velocity = Distance / Time = 1 m / 0.5 s = 2 m/s
So, Power = Force x (Distance / Time)
But Force= Mass x Acceleration due to gravity (g)
So, Force = 10 kg x 9.8 m/s $^{2}$ = 98
Therefore, Power =Force x Velocity= 98 x 2 = 196 W

5 0

3 years ago