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3 years ago

Manmade global warming is caused by what?

1 answer:

4 0

Human activities is the main reason of global warming such as factories and cars that causes carbon dioxide , carbon monoxide and other toxic gases

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If a 54 kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?

lora16 [44]

Answer:

Power, P = 600 watts

Explanation:

It is given that,

Mass of sprinter, m = 54 kg

Speed, v = 10 m/s

Time taken, t = 3 s

We need to find the average power generated. The work done divided by time taken is called power generated by the sprinter i.e.

$P=\dfrac{W}{t}$

Work done is equal to the change in kinetic energy of the sprinter.

$P=\dfrac{\dfrac{1}{2}mv^2}{t}$

$P=\dfrac{\dfrac{1}{2}\times 54\ kg\times (10\ m/s)^2}{3\ s}$

P = 900 watts

So, the average power generated by the sprinter is 900 watts. Hence, this is the required solution.

3 0

3 years ago

A net force is applied on a 100 kg rocket which causes the rocket to acceleration at 10 m/s2. The same net force is applied on a

ELEN [110]

Answer:

i dont know lo

Explanation:

8 0

2 years ago

In the decreasing order of magnitude, which of the following is correct?

Sergio [31]

Answer:

b. Static > sliding > rolling friction.

Explanation:

Static friction is greater than sliding friction. It takes more force to get an object to start sliding than to keep it sliding.

Sliding friction is greater than rolling friction. There are fewer points of contact for a round surface compared to a flat one.

5 0

3 years ago

If the force acting on an object is multiplied by _____, the product is called work

Aneli [31]

The distance the object travels

5 0

3 years ago

"Suppose you tie a rock to the end of a 0.96 m long string and spin it in a horizontal circle with a constant angular velocity o

Ber [7]

Answer:

The mass of the rock is $m = 2.46406 \ kg$

Explanation:

From the question we are told that

The length of the string is $l = 0.96 \ m$

The angular velocity is $w = 20.25 \ rad/s$

The tension on the string is $T = 970 \ N$

Generally the centripetal force acting on the rock is mathematically evaluated as

$T = mlw^2$

making m the subject of the formula

$m = \frac{T}{w^2 * l}$

substituting values

$m = \frac{970}{(20.25^2) * (0.96)}$

$m = 2.46406 \ kg$

8 0

3 years ago