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Rama09 [41]
3 years ago
11

A cyclist slows down from 8m/s to 2m/s in 3 seconds. What is the acceleration?

Physics
2 answers:
Brilliant_brown [7]3 years ago
7 0

Answer:

a=2ms⁻²

Explanation:

v=8ms⁻¹   u=2ms⁻¹   t=3secs

a=\frac{v-u}{t\\}

a=\frac{6}{3}

a=2ms⁻²

Vesnalui [34]3 years ago
5 0

Answer:

a=2ms-2

Explanation:

hope this helped

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A man and his dog are “walking” on flat Street. He is pulling on his stubborn dog with a force of 70 N Directed at a 30° angle f
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Answer:

X component of force is 60.62 N.

Y component of force is 35 N.

Force of gravity on the dog is 245 N.

Magnitude of normal force is 210 N.

Explanation:

Given:

Force of pull is, F=70\ N

Mass of the dog is, m=25\ kg

Angle of inclination is, \theta =30°

Acceleration due to gravity is, g=9.8\ m/s^2

The free body diagram of the dog is shown below.

The X and Y components of force of pull is given as:

F_X=F\cos \theta=(70)\cos (30)=60.62\ N\\F_Y=F\sin \theta=(70)\sin(30)=35\ N

Therefore, the X and Y components of the force are 60.62 N and 35 N respectively.

Force of gravity on the dog is the product of its mass and acceleration due to gravity. Thus,

F_g=mg=25\times 9.8=245\ N

Therefore, the force of gravity on the dog is 245 N.

Now, consider the motion in the vertical direction of the dog. As there is no motion in the vertical direction, the net force along the Y direction is 0. In other words, the total Upward force is equal to the total downward force.

From the free body diagram,

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The metal cases of electrical appliances are connected to an earth wire.Which statement is not correct?A The live wire may becom
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Given that metal cases of electrical appliances are connected to the wire, let's select the statement which is not correct from the list of statements.

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The Live wire may become loose and touch the metal case. In this case, the earth wire will channel the fault current to the earth thereby reducing the risk of electric shock.

If the metal case becomes live, the earth wire conducts current to the ground. This helps prevent electric shock from the metal case.

The Earth wire has low or no resistance. It is always made of copper.

It provides a low resistance path to the ground.

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C. The earth wire needs to have a high reistance.

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1 year ago
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Answer:

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