A crate of mass 50kg is pushed along a floor with a force of 20N for a distance of

A child slides down a snow‑covered slope on a sled. At the top of the slope, her mother gives her a push to start her off with a

kirill [66]

Answer:

θ = 13.16 °

Explanation:

Lets take mass of child = m

Initial velocity ,u= 1.1 m/s

Final velocity ,v=3.7 m/s

d= 22.5 m

The force due to gravity along the incline plane = m g sinθ

The friction force = (m g)/5

Now from work power energy

We know that

work done by all forces = change in kinetic energy

( m g sinθ - (m g)/5 ) d = 1/2 m v² - 1/2 m u²

(2 g sinθ - ( 2 g)/5 ) d = v² - u²

take g = 10 m/s²

(20 sinθ - ( 20)/5 ) 22.5 = 3.7² - 1.1²

20 sinθ - 4 =12.48/22.5

θ = 13.16 °

5 0

2 years ago

How is copyright infringement similar to plagiarism

Hoochie [10]

Answer:

Copyright infringement is using someone else's work without their permission amd plagiarism is claiming someone else's work as one's own

Explanation:

hope this helped you

8 0

2 years ago

Give reasons.

Yanka [14]

A. A stretched catapult can do work when released so it must have potential energy.

b. A stone on the ground will not move on its own ever again so it has zero energy.

c. In order to roll an object there must be a friction force between the object and the ground (otherwise it will slide)

d. To lift a stone you must overcome the weight which is the force due to gravity.

e. Work and energy are both measured in Joules.

4 0

2 years ago

a body thrown vertically upwards from grounf with inital vel 40m/s then time taken by it to reach max hieght is?

777dan777 [17]

Answer:

t = 4.08 s

Explanation:

if the body is thrown upward, it has negative gravity. Knowing through the International System that the earth's gravity is 9.8 m/s²

Data:

Vo = 40 m/s
g = -9.8 m/s²
t = ?

Use formula:

$\boxed{\bold{t=\frac{-(V_{0})}{g}}}$

Replace and solve:

$\boxed{\bold{t=\frac{-(40\frac{m}{s})}{-9.8\frac{m}{s^{2}}}}}$

$\boxed{\boxed{\bold{t=4.08\ s}}}$

Time taken by it to reach max height is <u>4.08 seconds.</u>

Greetings.

4 0

2 years ago

An inductor is connected in series to a fully charged capacitor. Which of the following statements are true? Check all that appl

Furkat [3]

Answer:

a. The stored electric field energy can be greater than the stored magnetic field energy.

b. As the capacitor is discharging, the current is increasing.

d. The stored electric field energy can be less than the stored magnetic field energy.

e. The stored electric field energy can be equal to the stored magnetic field energy.

Explanation:

We know that total energy of capacitor and inductor system given as

$TE=\dfrac{LI^2}{2}+\dfrac{CV^2}{2}$

L=Inductance ,I =current

C=Capacitance ,V=Voltage

The total energy of the system will be remain conserve.If energy in the inductor increases then the energy in the capacitor will decrease and vice -versa.

The values of stored energy in the capacitor and inductor can be equal ,greater or less than to each other.But the summation will be constant always.

Therefore the following option are correct

a ,b , d , e

6 0

2 years ago