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krok68 [10]
3 years ago
5

A ship travels north at 15 km/h for 5 h. What is the ship's displacement in km?

Physics
2 answers:
RUDIKE [14]3 years ago
7 0

Answer:

Displacement, d = 75 km

Explanation:

Given that :

The speed of the ship is 15 km/h. It travels for 5 h.

To find :

The displacement of the ship

Solve :

Let d is the displacement of the ship. It can be calculated using the definition of velocity. The total displacement per unit time is called the velocity of an object.

v=\dfrac{d}{t}

On rearranging,

d=v\times t

d=15\ km/h\times 5\ h

d = 75 km

Therefore, the ship's displacement is 75 km.

aliya0001 [1]3 years ago
3 0
So you would do 15*5 to get 75
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photoelectric effect

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Energy may be measured in?​
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Energy May be measured in joule

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A sled starts off with an initial velocity of 8 m/s and slows down to 2 m/s after 3 seconds. What was its acceleration?
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-2m/s

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3 0
2 years ago
Two identical bowling balls are rolling on a horizontal floor without slipping. The initial speed of both balls is v = 10 m/s. B
Lapatulllka [165]

Answer:

The difference between frictionless ramp and a regular ramp is that on a frictionless ramp the ball cannot roll it can only slide, but on a regular ramp the ball can roll without slipping.

We will use conversation of energy.

K_A_1 + U_A_1 = K_A_2 + U_A_2\\\frac{1}{2}I\omega^2 + \frac{1}{2}mv^2 + 0 = 0 + mgH_A

Note that initial potential energy is zero because the ball is on the bottom, and the final kinetic energy is zero because the ball reaches its maximum vertical distance and stops.

For the ball B;

K_B_1 + U_B_1 = K_B_2 + U_B_2

\frac{1}{2}I_B\omega^2 + \frac{1}{2}mv^2 + 0 = 0 + mgH_B

The initial velocities of the balls are equal. Their maximum climbing point will be proportional to their final potential energy. Since their initial kinetic energies are equal, their final potential energies must be equal as well.

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Explanation:

4 0
3 years ago
In the context of energy transfers with hot and cold reservoirs, the sign convention is that _______________.
Likurg_2 [28]

Answer:

B. QC > 0; QH < 0

Explanation:

Given that there are two reservoir of energy.

Sign convention for heat and work :

1.If the heat is adding to the system then it is taken as positive and if heat is going out from the system then it is taken as negative.

2. If the work is done on the system then it is taken as negative and if the work is done by the system then it is taken as positive.

From hot reservoir heat is going out that is why it is taken as negative

Q_H

From cold reservoir heat is coming inside the reservoir that is why it is taken as positive

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That is why the answer will be

Q_H ,Q_C>0

8 0
3 years ago
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