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2 years ago

A football player runs down the field at a speed of 8 m/s how long will it take him to run 20 m?

1 answer:

4 0

The answer is simple. Since the football player runs at 8m/s and you are trying to find out how long it will take him to run 20 m, you simply divide 20/8.

The answer to this would be 2.5 seconds for the football player to run 20 meters.
I hope I did this problem correct and I hope that this helped you :)))

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What is the amount of heat, in Sl units, necessary to melt 1 lb of ice?

likoan [24]

Answer:

Heat required to melt 1 lb of ice is 151.469 KJ

Explanation:

We have given mass of ice = 1 lb

We know that 1 lb = 0.4535 kg

Latent heat of fusion for ice =334 KJ/kg

Amount if heat for fusion of ice is given by

$Q=mL$ , here m is mass of ice and L is latent heat of fusion

So heat $Q=mL=0.4535\times 334=151.469kj$

So heat required to melt 1 lb of ice is equal to 151.469 KJ

3 0

2 years ago

(A) State the relation between acceleration and momentum (10 marks).

ohaa [14]

Answer:

momentum is directly proportional to acceleration

4 0

2 years ago

A semi-trailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway truck ramp th

aleksklad [387]

<u>Answer:</u>

The velocity is 30.279 m/s

<u>Explanation</u>:

Consider the initial speed of the semi-trailer be v

Then, initial kinetic energy = $\frac{1}{2} mv^2$

According to question, the semi-trailer coast along a ramp, which is inclined at an angle of 170, and to a distance of 160m to stop

Change in vertical position = $h=160 \times \sin 17^{\circ}-0$ = 46.779m

Final potential energy of semitrailer = mgh

Applying principle of conservation of energy,

$\frac{1}{2} mv^2$ = mgh

Solving for v, we get $v^2$ = 2gh = 2*9.8*46.779 = 916.8684

$v^2$ = 916.8684

v = 30.279 m/s

Therefore, the velocity is 30.279 m/s

6 0

2 years ago

Using numbers to describe kinematic quantities is called what description?

MissTica

sorry dont know this

4 0

3 years ago

What is electromagnetic indiction

lora16 [44]

Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction.

6 0

2 years ago