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2 years ago

Prove that Efficiency=MA/ VR x 100%

Physics

1 answer:

geniusboy [140]2 years ago

5 0

I HOPE IT WILL HELP YOU. Have a great day ahead.

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When a 0.1-kilogram pendulum bob reaches the top of its swing, how much kinetic energy does it have?

zvonat [6]

When ANY pendulum bob reaches the top of its swing,
it stops momentarily and then begins to drop. At the instant
when it stops, its kinetic energy is zero.

7 0

3 years ago

A cyclist intends to cycle up a 7.70o hill whose vertical height is 126m. Assuming the mass of bicycle plus person is 75.0kg, ca

Ksivusya [100]

Answer:

92704.5 J

596.44737 N

Explanation:

m = Mass of person + bicycle = 75 kg

g = Acceleration due to gravity = 9.81 m/s²

h = Vertical height = 126 m

$\theta$ = Angle = 7.7°

d = Diameter = 0.388 m

Work done against gravity is given by

$P=mgh\\\Rightarrow P=75\times 9.81\times 126\\\Rightarrow P=92704.5\ J$

Work done is 92704.5 J

Force required is given by

$F=\dfrac{mgrsin\theta}{\pi d}\\\Rightarrow F=\dfrac{75\times 9.81\times sin7.7\times 5.12}{\pi\times 0.388}\\\Rightarrow F=596.44737\ N$

The force is 596.44737 N

7 0

3 years ago

A person in a kayak starts paddling, and it accelerates from 0 to 0.680 m/s in a distance of 0.428 m. If the combined mass of th

d1i1m1o1n [39]

Answer:

Net force, F = 44.66 N

Explanation:

It is given by,

Initial velocity of the person, u = 0

Final velocity of the person, v = 0.68 m/s

Distance, s = 0.428 m

Combined mass of the person and the kayak, m = 82.7 kg

We need to find the net force acting on the kayak i.e.

F = ma...........(1)

Firstly, we will calculate the value of "a" from third equation of motion as :

$v^2-u^2=2as$

$a=\dfrac{v^2-u^2}{2s}$

$a=\dfrac{(0.68\ m/s)^2-0}{2\times 0.428\ m}$

$a=0.54\ m/s^2$

Put the value of a in equation (1) as :

$F=82.7\ kg\times 0.54\ m/s^2$

F = 44.66 N

So, the net force acting on the kayak is 44.66 N. Hence, this is the required solution.

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3 years ago

Vector A = 50 m,<br> 20°. Vector -3A would be equal to

Kruka [31]

Answer:

Many familiar physical quantities can be specified completely by giving a single number and the appropriate unit. For example, “a class period lasts 50 min” or “the gas tank in my car holds 65 L” or “the distance between two posts is 100 m.” A physical quantity that can be specified completely in this manner is called a scalar quantity. Scalar is a synonym of “number.” Time, mass, distance, length, volume, temperature, and energy are examples of scalar quantities.

3 0

3 years ago

Are S waves transvers? (Need answer fast, hurry)

pychu [463]

Answer:

Yes they are transverse

Explanation:

7 0

3 years ago

Read 2 more answers