3 years ago

A moving object has a kinetic energy of 150J. what is the mass of the object if its momentum is 25kgm/s

Physics

1 answer:

Umnica [9.8K]3 years ago

8 0

Answer:

hooopppee itt heeelppss

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dybincka [34]

The above answer is correct!

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Which one is the best to measure a tree kilometers,millimeters,liters or meters?

oksano4ka [1.4K]

Metres would be best

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3 years ago

If you can walk 3 miles per hour, how much is that in meters per second?

deff fn [24]

To convert 3 miles per hour into m/s, first we have to convert miles in to meter and then hour in to second.

As $1 miles = 1.609344 km = 1.609344\times 10^3 m = 1609.3 m$ and $1 hour=60 minutes = 60\times 60= 3600s$

Therefore,

$3 miles/ h=\frac{3\times1609.3m}{3600s} =1.34 m/s$

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3 years ago

A 2.00 kg rock is dropped from the top of a 30.0 m high building. Calculate the ball’s momentum at the time that it strikes the

Darya [45]

Explanation:

We use the Theorem of conservation of mechanical energy for finding the velocity when it strikes the ground:

Ei = Ef

Ki + Ui = Kf + Uf

Ui = Kf

m g h = 1/2 m v^2

v = sqrt(2gh)

So the momentum will be:

p = mv = m * sqrt(2gh)

5 0

3 years ago

It is interesting to speculate on the properties of a universe with different values for the fundamental constants.

qwelly [4]

Answer:

Part a)

$\lambda = 0.345 m$

Part b)

$\Delta x = 0.274 m$

Part c)

$r = 2.8 \times 10^{11} m$

Explanation:

Part a)

De broglie wavelength is given as

$\lambda = \frac{h}{mv}$

$\lambda = \frac{1}{(0.145)(20)}$

$\lambda = 0.345 m$

Part b)

By principle of uncertainty we know that

$\Delta x \times \Delta P = \frac{h}{4\pi}$

$\Delta x \times (0.145)(21 - 19) = \frac{1}{4\pi}$

$\Delta x = 0.274 m$

Part c)

As we know that

$\frac{kq_1q_2}{r^2} = \frac{mv^2}{r}$

also we know

$mvr = \frac{nh}{2\pi}$

$v = \frac{h}{2\pi mr}$

now we have

$\frac{ke^2}{r} = \frac{mh^2}{4\pi^2m^2 r^2}$

$r = \frac{h^2}{4\pi^2mke^2}$

$r = 2.8 \times 10^{11} m$

5 0

3 years ago