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2 years ago

Forces can...

Physics

1 answer:

dlinn [17]2 years ago

7 0

Answer:

Explanation:

Forces can change speed of motion, the more force that's applied when you push a ball for example, the faster the ball will go. Force can also change the shape of objects by applying pressure to them too. The inertia from force can change direction, as when you let's say hit a tennis ball, it won't go perfectly straight. So all of the above are correct

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A box weighing 43.2 N is pulled horizontally until it slides uniformly lat a constant

GREYUIT [131]

Your diagram should include four forces:

• the box's weight, pointing down (magnitude w = 43.2 N)

• the normal force, pointing up (mag. n)

• the applied force, pointing the direction in which the box is sliding (mag. p = 6.30 N, with p for "pull")

• the frictional force, pointing oppoiste the applied force (mag. f )

The box is moving at a constant speed, so it is inequilibrium and the net forces in both the vertical and horizontal directions sum to 0. By Newton's second law, we have

n + (-w) = 0

and

p + (-f ) = 0

So then the forces have magnitudes

w = 43.2 N

n = w = 43.2 N

p = 6.30 N

f = p = 6.30 N

5 0

2 years ago

The express train can travel 100 miles per hour. This information describes the train's

Tomtit [17]

Speed. This ONLY includes the miles per hour. If it had a direction it would be velocity.

7 0

3 years ago

Read 2 more answers

A kangaroo jumps straight up to a vertical height of 1.66 m. How long was it in the air before returning to Earth? Express your

Nataly [62]

Answer:

The kangaroo was 1.164s in the air before returning to Earth

Explanation:

For this we are going to use the equation of distance for an uniformly accelerated movement, that is:

$x = x_{0} + V_{0}t + \frac{1}{2}at^2$

Where:

x = Final distance

xo = Initial point

Vo = Initial velocity

a = Acceleration

t = time

We have the following values:

x = 1.66m

xo = 0m (the kangaroo starts from the floor)

Vo = 0 m/s (each jump starts from the floor and from a resting position)

a = 9.8 m/s^2 (the acceleration is the one generated by the gravity of earth)

t =This is just the time it takes to the kangaoo reach the 1.66m, we don't know the value.

Now replace the values in the equation

$x = x_{0} + V_{0}t + \frac{1}{2}at^2$

$1.66 = 0 + 0t + \frac{1}{2}9.8t^2$

$1.66 = 4.9t^2$

$\frac{1.66}{4.9} = t^2$

$\sqrt{0.339} = t\\ t = 0.582s$

It takes to the kangaroo 0.582s to go up and the same time to go down then the total time it is in the air before returning to earth is

t = 0.582s + 0.582s

t = 1.164s

The kangaroo was 1.164s in the air before returning to Earth

5 0

3 years ago

The salinity of the oceans has been relatively constant throughout geologic time because salt is removed at the same rate at whi

tia_tia [17]

True

Explanation:

It is correct to say that the salinity of the oceans has been relatively constant throughout geologic time because salt is removed at the same rate it has been added.

Salinity is the amount of dissolved salt found in the ocean. It is the degree of saltiness of the ocean.

The rate at which salt has been added into the ocean over the years through geologic time has been very constant.
Most salts in the ocean comes from land.
Also the rate it has been removed is fairly constant.
The salinity of ocean has once been used to date the age of the earth.

learn more:

Salinity brainly.com/question/10491444

#learnwithBrainly

5 0

2 years ago

Things move in different _ _ _ _ _ _ _ _ _ ?

Volgvan

Explanation:

Things move in a different direction

8 0

3 years ago