7) A6 kg ball is thrown at 12 m/s. What is the momentum of the ball before it strikes a pin?

Bill is throwing a football at four targets and attempting to knock them over. Which of the following targets will be hardest fo

Naddika [18.5K]

100 g lead target. Lead has a very high density which means even a very small volume and weight quite a lot. So because the lead target weighs only 100 g it's going to be small in size compared to other targets which are all made of lesser dense materials than lead.

7 0

3 years ago

An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. The lens for one eye has a power of 1.16

igomit [66]

Answer:

m = 8

Explanation:

A telescope is a device that allows us to see objects that were very far from us, it is built by the combination of two lenses, the one with the lowest focal length near the eye and that is the one or the one with the greatest focal length, the most eye-flounder . The magnification of the telescope is

m = - f₀ / $f_{e}$

Where f₀ is the focal length of the lens and f_{e} is the false distance of the eyepiece.

It is this problem that gives us the diopter of each lens, these are related to the focal length in meters

D = 1 / f

Let's find the focal length

f₁ = 1 / D₁

f₁ = 1 / 1.16

f₁ = 0.862 m

f₂ = 1 / 9.37

f₂ = 0.1067 m

Therefore, the lens with f₂ is the eyepiece and the slow one with the

distance focal f₁ is the objective.

Let's calculate

m = - f₂ / f₁

m = - 0.862 / 0.1067

m = 8

8 0

3 years ago

Which best describes Earth's magnetic pole?

goblinko [34]

Answer:

b

Explanation:

because with no pole there is no role

7 0

3 years ago

Read 2 more answers

write down the total momentum for two marbles of mass,m, both moving at velocity, v. What is the kinetic energy of the system.

frosja888 [35]

Mv + mv = 2mv providing each momentum is in the same direction.
1/2 mv^2 + 1/2 mv^2 = mv^2

4 0

3 years ago

Read 2 more answers

An emf of 28.0 mV is induced in a 501 turn coil when the current is changing at a rate of 12.0 A/s. What is the magnetic flux th

dmitriy555 [2]

Answer:

Φ = 5.589×10⁻⁵ Wb

Explanation:

The inductance of a coil is given as

L = e/(di/dt) ..................... Equation 1

Where L = inductance of the coil, e = induced e.m.f, di/dt = rate of change of current in the coil.

Also,

The inductance of each turn of the coil when a magnetic field is step up in the coil is

L = NΦ/i ................. Equation 2

Where N = number of turns, Φ = magnetic field, i = current.

equating equation 1 and equation 2

e/(di/dt) = NΦ/i

making Φ the subject of the equation,

Φ = (e×i)/N.(di/dt) .................. Equation 3

Given: e = 28.0 mV = 0.028 V, N = 501 turns, di/dt = 12.0 A/s, i = 4.00 a

Substitute into equation 3,

Φ = (0.028×4)/(12×501)

Φ = 0.112/2004

Φ = 5.589×10⁻⁵ Weber

Φ = 5.589×10⁻⁵ Wb

6 0

3 years ago