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3 years ago

3. An explosion of gas from a Hawaiian volcano blows a bunch of rocks into the sky. Each has 2000J of

Physics

1 answer:

anzhelika [568]3 years ago

4 0

Answer: 3.906kg

Explanation:

K.E = 2000J

V = 32m/s

m =?

K.E = 1/2MV2

2000 = 1/2M x (32^2)

2000 = 1/2M x 1024

2000 = 512M

M = 2000/512

M = 3.906kg

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To produce a magnetic field, What does an electromagnet require?

kodGreya [7K]

Selection D makes most sense

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3 years ago

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George Washington Gale Ferris, Jr., a civil engineering graduate from Rensselaer Polytechnic Institute, built the original Ferri

MA_775_DIABLO [31]

Answer:

$KE = 4217 J$

Explanation:

As we know that the wheel is rotated at constant angular speed

so here we can say that the angular speed is given as

$\omega = \frac{2\pi}{T}$

$\omega = \frac{2\pi}{2 \times 60}$

$\omega = 0.052 rad/s$

now the moment of inertia of all passengers is given as

$I = 36(60)(\frac{76}{2})^2$

$I = 3119040 kg m^2$

now work done by machine must be equal to kinetic energy of the system

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3 years ago

You stand on a bridge above a river and drop a rock into the water below from a height of 35m (assume no air resistance)

Katyanochek1 [597]

Answer:

Free fall time t:

2.6717061011357 sec

Free fall velocity v:

26.200486636702 m/s

= 94.321751892127 km/h

Explanation:

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3 years ago

A 1 kg ball is loaded into a spring gun with a spring constant of 105 N/m. If the spring iscompressed by 0.1 m and the ball is s

Rainbow [258]

Answer:

H = 5.35 cm

Explanation:

As per energy conservation we know that energy stored in the spring is converted into gravitational potential energy when it is reached at the top

now we have

$\frac{1}{2}kx^2 = mgh$

here we know that

m = 1 kg

k = 105 N/m

x = 0.1 m

now plug in all data in it

$\frac{1}{2}(105)(0.1^2) = 1(9.81)(H)$

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3 0

3 years ago

The sideview mirrors on cars are convex mirrors. Let's say the mirror on the driver's side of your car has a focal length with a

Arisa [49]

Answer:

a) i = -2.53 m , b) m = 0.63

Explanation:

a) For this exercise we use the constructor equation

1 / f = 1 / o + 1 / i

Where f is the focal length, o the distance to the object and i the distance to the image

In this exercise they give the focal length f = -6.90 m, the negative sign is a convex mirror, and the distance to the object is o = 4.00 m

Let's find the distance to the image

1 / i = 1 / f - 1 / o

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1 / i = -0.1449-0.25 = 0.3949

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.b) the expression for the magnification is

m = - i / o

m = - (-2.53) / 4

m = 0.63

6 0

3 years ago