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2 years ago

A person runs at a speed of 4 meters per second. How far will the person travel in 40 seconds?

1 answer:

5 0

To determine the distance (d) traveled by a body given its speed (S) and the time (t). Use the equation,

S = d / t ; d = S x t

Substituting the known values to the equation,

d = (4 m/s ) x (40 s) = 160 m

Thus, the person will travel 160 meters in 40 seconds.

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A steel ball is dropped from a building's roof and passes a window, taking 0.12 s to fall from the top to the bottom of the wind

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The top of the WINDOW is 19 meters from the ground. also steel balls dont bounce.

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3 years ago

The energy of motion is called

liubo4ka [24]

<span>A. kinetic energy. </span>

Friction converts kinetic energy into heat, and so it represents a net loss of mechanical energy. When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into heat. As demonstrated by the use of friction created by rubbing pieces of wood together to start a fire, kinetic energy is converted to heat whenever motion with friction occurs. The friction produced by brake pads in a car must generate a quantity of heat equal to the kinetic energy of the car and as a result, the brakes get quite hot.

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3 years ago

Read 2 more answers

An object is dropped from rest from a height of 4.4 107 m above the surface of the Earth. If there is no air resistance, what is

kondaur [170]

Answer:

Explanation:

An object is drop from a height, then it is in direction of gravity

g is +ve

When an object drop from a height, the initial velocity is 0,

U=0

Given that h=4.4×10^7m

V=?

g=9.81m/s^2

Then using equation of motion

V^2=U^2+2gh

V^2=0+2×9.81×4.4×10^7

V^2=86.33×10^7m/s

Take square root of both side

V=29381.63m/s

Now to km/s, divide by 1000

Since 1km=1000m

V=29.38km/s

6 0

3 years ago

Why would the bulb not light?

NemiM [27]

Answer:

It's not connected to the negative end of the battery

Explanation:

To turn on it would need to connect to the positive (+) and negative (-) ends of the battery

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3 years ago

Look at the data table and graph for the 50-coil electromagnet. With the 1.5 V battery, the electromagnet picked up an average o

Triss [41]

1) The ratio between the number of turns of the two electromagnets is 2

2) The ratio between the number of paper clips picked up is 2.2

Explanation:

An electromagnet is a device consisting of a coil of wire wrapped around an iron core. Such a device is able to create a magnetic field, and in this problem this is used to attract and pick up the paper clips.

In this problem, we have two electromagnets:

- The first one has 50 turns

- The second one has 25 turns

Therefoore, the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet is:

$\frac{N_1}{N_2}=\frac{50}{25}=2$

The strength of the magnetic field produced by an electromagnet is directly proportional to the number of turns in the coil wrapped on the electromagnet:

$B\propto N$