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3 years ago

The rate at which velocity changes is called

1 answer:

6 0

The answer is acceleration.

Acceleration is the rate at which velocity changes over time. The relationship between acceleration and velocity is presented in the formula:
a = Δv/Δt
The SI unit of acceleration is m/s² derived as following:
a = Δv/Δt [ = ] (m/s)/s = m/s * s = m/s²

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In the child's game of tetherball, a rope attached to the top of a tall pole is tied to a ball. Players hit the ball in opposite

Eddi Din [679]

Answer:

option C

Explanation:

the ball is moving circular around the pole

Angular momentum of the system is constant

J = I ω

now,

$\omega\ \alpha\ \dfrac{1}{I}$

$\omega\ \alpha\ \dfrac{1}{mr^2}$

$\omega\ \alpha\ \dfrac{1}{r^2}$

the rope radius is decreasing as it revolving around the pole

angular speed is inversely proportional to radius.

so, the angular speed will increase.

The correct answer is option C

7 0

3 years ago

You take the same 3 kg metal block and slide it along the floor, where the coefficient of friction is only 0.4. You release the

spin [16.1K]

Answer:

1.52905 seconds

4.58715 m

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

$\mu$ = Coefficient of friction = 0.4

g = Acceleration due to gravity = 9.81 m/s²

a = Acceleration = $\mu g$

Equation of motion

$v=u+at\\\Rightarrow t=\frac{v-u}{\mu g}\\\Rightarrow t=\frac{0-6}{-0.4\times 9.81}\\\Rightarrow t=1.52905\ s$

It will take 1.52905 seconds for the block to slow down

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2\mu g}\\\Rightarrow s=\frac{0^2-6^2}{2\times 0.4\times -9.81}\\\Rightarrow s=4.58715\ m$

The block will travel 4.58715 m before it stops

7 0

3 years ago

What Is meant By MA of a machine is 2?

stich3 [128]

Answer:

See below ~

Explanation:

The Mechanical Advantage (MA) is defined as the ratio between the force produced by the machine to the force applied to it.

=============================================================

So,

⇒ $\frac{F(out)}{F(in)} = 2$

⇒ This means that the force produced is twice the applied force

7 0

2 years ago

Magnetic poles that are alike a. attract each other. b. repel each other. c. do not interact. d. have the same shape.

Vera_Pavlovna [14]

They repel each other.

4 0

3 years ago

Read 2 more answers

Which device is using a motor?

Alexxx [7]

Out of all the options, only body massager which uses electric energy to move back and forth is using motor here. It is because a motor converts electrical energy to Mechanical energy and only massager obeys it among all the options.

In short, Your Answer would be Option C

Hope this helps!

5 0

3 years ago

Read 2 more answers