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Rashid [163]
3 years ago
9

When a basketball player dribbles a ball, it falls to the floor and bounces up. Is a force required to make it bounce? Why? If a

force is needed, what is the agent involved?
Physics
1 answer:
Marizza181 [45]3 years ago
5 0
Energy is the one that is stored in the ball when it drops. Just before it hits the ground, the energy depends on the mass of the ball and its velocity. When the ball hits, it is compressed and the energy is stored in the compression of the air in the ball and the elasticity of the material that the ball is made from. Some is also converted to heat. The stored energy in the ball causes a force to make the ball back into a round shape and this force presses against the propels and floor the ball back up. The small amount lost as heat is the reason that the ball bounces up with less energy than when it hit.
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Match each key term with the correct definition.
oksano4ka [1.4K]

Answer:

Radioisotope -> An atom with an unstable nucleus

Radioactivity -> The spontaneous discharge of energy from an unstable nucleus

Radioactive Decay -> The process by which the nucleus of an unstable isotope changes

Strong Nuclear Force -> Binds protons and neutrons together in the nucleus

Explanation:

Just completed the question

8 0
3 years ago
Two bulbs marked 200 W-250 V and 100 W-250 V are joined in
lozanna [386]

Answer:

<em>P = 66.67 W</em>

Explanation:

<u>Joule Heating</u>

It's the process by which the electric current passing through a conductor produces heat.

Also known as Joule's first law or the Joule–Lenz law, states that the power of heating generated by an electrical conductor (P) is proportional to the product of its resistance (R) and the square of the current (I).

It can be described by the equation that follows:

P = I^2.R

Also, we can calculate the voltage V with the formula of Ohm's law:

V = I.R

Combining both equations, power can be related to the voltage:

\displaystyle P=\frac{V^2}{R}

Given the power and the voltage, the resistance can be calculated by solving for R:

\displaystyle R=\frac{V^2}{P}

There are two bulbs marked P=200W V=250V and P=100 W V=250.

The first bulb has a resistance of:

\displaystyle R_1=\frac{250^2}{200}

\displaystyle R_1=312.5\Omega

The first bulb has a resistance of:

\displaystyle R_2=\frac{250^2}{100}

\displaystyle R_1=625\Omega

When connected in series, the total resistance is

R = R_1 + R_2=312.5\Omega+625\Omega

R=937.5\Omega

The total power consumed when connecting them to a V=250 V supply is:

\displaystyle P=\frac{250^2}{937.5}

P = 66.67 W

4 0
3 years ago
Which part of the electromagnetic spectrum has a lower frequency than visible light?
miv72 [106K]

Answer:

infrared

Explanation:

Electromagnetic spectrum w.r.t. increasing frequency is

Radio waves

Microwaves

Infra red

visible

ultra violet

x rays

gamma rays

3 0
3 years ago
Which term describes the transfer of thermal energy from one object to another because of a difference in temperature? 1.energy
gregori [183]
The answer is 3.heat
6 0
3 years ago
In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at vary
Evgesh-ka [11]

Answer:

range of movement is 1.49 mm

Explanation:

given data

focal length = 45 mm

distance = 1.4 m

distance from the lens = 35 mm

distance from infinity down = 1.4 m =

to find out

range of movement

solution

we will apply here lens equation that is

1/f = 1/p + 1/q

here f = 45 and p =  infinity to 1400 mm

we find here image distance that is q

1/45 = 0 + 1/q             ......1

q = 45 mm

and

1/45 = 1/1400 + 1/q     ......2

q = 46.49

so range of movement

that is 46.49 - 45

range of movement is 1.49 mm

8 0
3 years ago
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