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2 years ago

Which of the objects have only potential energy?

Physics

1 answer:

vitfil [10]2 years ago

4 0

Answer:

A raised weight.

Water that is behind a dam.

A car that is parked at the top of a hill.

A yoyo before it is released.

River water at the top of a waterfall.

A book on a table before it falls.

A child at the top of a slide.

Ripe fruit before it falls.

Explanation:

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PRELIMINARY QUESTIONS

zimovet [89]

French fries were on your car

3 0

3 years ago

In a certain region of space near earth's surface, a uniform horizontal magnetic field of magnitude B exists above a level defin

dmitriy555 [2]

Answer:

a) F = $\frac{\pi d^2B^2lv}{16p}$

b) attached below

c) 0.037 m/s

Explanation:

a) Determine the magnetic "drag" force acting at the moment

speed = v

first step: determine current in the loop

I = $\frac{\pi d^2}{16pl} B lv$ ----- ( 1 )

given that the current will induce force on the three sides of the loop found in the magnetic field

forces on vertical sides = + opposite

we will cancel out

hence equation 1 becomes

F = $\frac{\pi d^2B^2lv}{16p}$ ( according to Lenz law we can say that the direction of force is upwards and this force will slow down the decrease in flux )

b) Determine the formula for Vt

attached below

c) Find Vt

given :

B = 0.80 T

density of copper = 8.9 * 10^3 kg/m^3

resistivity of copper = 1.68 * 10^-8 Ωm

∴ Vt = 16 ( 8.9 * 10^3 kg/m^3 ) ( 1.68 * 10^-8 Ωm ) ( 9.8 m/s^2 ) / ( 0.08 T)^2

= 0.037 m/s

3 0

3 years ago

A force exerted on an object produces acceleration. If the mass remains the same and the acceleration is doubled, the force must

LiRa [457]

If both the net force and the mass are doubled, the acceleration will be unchanged.

7 0

3 years ago

A pendulum is moving 2.0 m/s at the bottom of its swing. How high vertically will it go before it begins to swing back? Group of

steposvetlana [31]

Answer:

h = 0.2 m

Explanation:

Given that,

A pendulum is moving 2.0 m/s at the bottom of its swing.

We need to find the height high it swing back. Let the height is h.

Using the conservation of energy such that,

$\dfrac{1}{2}mv^2=mgh\\\\h=\dfrac{v^2}{2g}$

Put all the values,

$h=\dfrac{(2)^2}{2\times 10}\\\\h=0.2\ m$

So, it will reach to a height of 0.2 m.

5 0

3 years ago

How is a game of Flag Rugby started?

Snowcat [4.5K]

The game is started by a PUNT or DROP KICK to the opposing team from the MID FIELD line. The object of the game is to score by placing the ball on or behind the opponents' goal goal line.

5 0

3 years ago

Read 2 more answers