The power, P (watts), of a car engine is proportional to the square of its speed, s (m/s). When s = 35, P = 1760.
Work out the power (to 1 DP) when the speed is 40 m/s

P = 2288 W

Step-by-step explanation:

The power, P (watts), of a car engine is proportional to the square of its speed i.e.

or

Put s = 35, P = 1760 to find k.

Now put k = 1.43 and s = 40. So,

So, the new power is 2288 W when the speed is 40 m/s.

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d