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3 years ago

A bike travels 4 miles in half an hour at what speed

2 answers:

5 0

8 miles per hour
because if it is moving at 4 miles every half hour that means you have to multiply it by two to get it in miles per hour and we all know that 4 times 2 is 8 so it would be 8 miles per hour =)

Dennis_Churaev [7]3 years ago

3 0

8 miles per hour.
If he drives 4 miles in half an hour, it means that he will drive 8 miles in one hour. (multiply by 2) In order to drive 8 miles in an hour, you need to be driving 8 miles per hour. Therefore he traveled 4 miles in half an hour at the speed of 8 miles per hour.

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Which statements about kinetic energy are true?

Kruka [31]

Answer: All 3 but the last one

Explanation:

8 0

3 years ago

The sun emits energy by converting hydrogen into helium. what is this process called?

AleksAgata [21]

The answer is Nuclear Fusion. The sun emits energy by converting hydrogen into helium. Nuclear fusion does two things, it converts hydrogen into helium and it also converts mass to energy.

7 0

4 years ago

What is the change in momentum of a 1000kg car moving from 1 m/s to 8m/s

natita [175]

Answer:

Explanation:

In order to calculate the change of any quantity you must substract the initial value of that quantity from the final value of the same quantity.

The concept of momentum is defined as,

Momentum = mass×velocity

So we calculate the change of momentum as,

Momentum change = final momentum - initial momentum

= mv - mu =m(v-u)

Where v = final velocity

u = initial velocity

m = mass of the object

So to calculate the momentum change of the car,

Change in momentum of the car = 1000×(8-1) = 1000×7 = 7000 Ns

5 0

3 years ago

Suppose that the average speed (vrms) of carbon dioxide molecules (molar mass 44.0 g/mol) in a flame is found to be 2.67 105 m/s

34kurt

Answer:

$T = 1.26 \times 10^8 K$

Explanation:

As we know that rms speed of ideal gas is given by the formula

$v_{rms} = \sqrt{\frac{3RT}{M}}$

here we know that

$v_{rms} = 2.67 \times 10^5 m/s$

molecular mass of gas is given as

$M = 44 g/mol = 0.044 kg/mol$

now from above formula we have

$2.67\times 10^5 = \sqrt{\frac{3(8.31)T}{0.044}}$

now we have

$T = 1.26 \times 10^8 K$

7 0

4 years ago

7. 100 Joules of work was done to move an object with a force of 15 N. How far did the

worty [1.4K]

Answer:Distance=6.67 (rounded)

Explanation: Work = Force x Distance.

100 Joules of work= force of 15 N x Distance (?)

The work equation given above can be rearranged to find force or distance if the other variables are known:

Distance=Work / force

Distance=100Joules/15 N

Distance=6.67 (rounded)

7 0

3 years ago