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2 years ago

A person throws a tennis ball 6 m/s straight up. How long does it take for it to come back to their hand?

Physics

1 answer:

Alja [10]2 years ago

7 0

(t) = 2t = 1.22 sec. I believe ...

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A bumblebee carries pollen from the male portion of a plant to the female portion of the same flower. Fertilization occurs. Whic

igor_vitrenko [27]

A because read the paragraphs

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2 years ago

Suppose that in a lightning flash the potential difference between a cloud and the ground is 0.96×109 V and the quantity of char

Dvinal [7]

(a) $2.98\cdot 10^{10} J$

The change in energy of the transferred charge is given by:

$\Delta U = q \Delta V$

where

q is the charge transferred

$\Delta V$ is the potential difference between the ground and the clouds

Here we have

$q=31 C$

$\Delta V = 0.96\cdot 10^9 V$

So the change in energy is

$\Delta U = (31 C)(0.96\cdot 10^9 V)=2.98\cdot 10^{10} J$

(b) 7921 m/s

If the energy released is used to accelerate the car from rest, than its final kinetic energy would be

$K=\frac{1}{2}mv^2$

where

m = 950 kg is the mass of the car

v is the final speed of the car

Here the energy given to the car is

$K=2.98\cdot 10^{10} J$

Therefore by re-arranging the equation, we find the final speed of the car:

$v=\sqrt{\frac{2K}{m}}=\sqrt{\frac{2(2.98\cdot 10^{10})}{950}}=7921 m/s$

5 0

3 years ago

Which materials produce greater or fewer vibrations on a roller coaster?

mixer [17]

Steel materials produce less vibrations whilst less dense and more malleable parts produce more vibrations, e.g. the wooden part of the coaster itself.

3 0

2 years ago

Fossils have been found on two continents that are split apart, this is evidence that ?

Crank

B. the continents were once joined together..... this is pangaea

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2 years ago

Which electromagnetic wave has wavelengths just longer than visible light? A. infrared radiation B. ultraviolet radiation C. mic

Nady [450]

Answer:

The correct answer is A and B

Explanation:

Light is part of the spectrum of electromagnetic energy along with radio waves, microwaves, infrared, visible light, ultraviolet, X rays and Gamma rays.

Radio waves and microwaves lie on one end of the spectrum, the longer end of electromagnetic energy.

X rays and Gamma rays have very short wavelengths .

I hope it helps!

7 0

3 years ago

Read 2 more answers