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3 years ago

11. In order for an object moving at 10 m/s to have a kinetic energy of 1800

Physics

1 answer:

svetlana [45]3 years ago

4 0

Answer:

20 to 30

Explanation:

20 to 30 is the correct answer

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A solid silver sphere of radius a = 2.5 cm has a net charge Qin = - 3.0 mC. The sphere is surrounded by a concentric copper sphe

MatroZZZ [7]

Answer:

Part a)

tex]V = -1 \times 10^8 Volts[/tex]

Part b)

$V_{inner} = V_{outer} = -1 \times 10^8 volts$

Part c)

$V = -7.30 \times 10^8 Volts$

Explanation:

Part a)

Net charge distribution on each shell is given as

On surface of radius "a"

$q_a = -3.0 mC$

on radius "b"

$q_b = 3 mC$

on radius "c"

$q_c = -1.0 mC$

Now potential at the outer shell is

$V = \frac{kq_c}{r_c}$

$V = \frac{(9\times 10^9)((-1\times 10^{-3})}{0.09}$

$V = -1 \times 10^8 Volts$

Part b)

Since copper sphere is a conducting sphere so here it will be an equi potential surface

So the potential will remain same throughout the surface of this sphere

Now we can say

$V_{inner} = V_{outer} = -1 \times 10^8 volts$

Part c)

Now electric potential at inner sphere is given as

$V = \frac{kq_a}{r_a} + \frac{kq_b}{r_b} + \frac{kq_c}{r_c}$

$V = \frac{(9\times 10^9)(-3 mC)}{0.025} + \frac{(9\times 10^9)(3 mC)}{0.06} + \frac{(9\times 10^9)(-1 mC)}{0.09}$

$V = -7.30 \times 10^8 Volts$

3 0

3 years ago

Geneva says that the only thing that is needed for people to hear the sounds around us is a vibrating object. Do you agree with

nadezda [96]

No, I do not agree with her. In order for sounds to be heard, the sound wave produced by a vibrating object needs to travel from the vibrating object to the ear through a medium.

6 0

3 years ago

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A fox ﬂeeing from a hunter encounters a 0.700 m tall fence and attempts to jump it. The fox jumps with an initial velocity of 7.

iris [78.8K]

Answer:0.61 m

Explanation:

Given

Initial velocity (u)=7.40 m/s

launch angle $\theta =45^{\circ}$

height of fence=0.7 m

Trajectory of Projectile is given by

$y=x\tan \theta -\frac{gx^2}{2u^2\cos^2\theta }$

For x=2.1 m

$y=2.1\tan (45)-\frac{9.8\times 2.1^2}{2\times 7.4^2\times (\cos 45)^2}$

$y=2.1-0.789$

$y=1.31 m$

At x=2.1 m Y=1.31

therefore Fox clear fence by a margin =1.31-0.7=0.61 m

7 0

3 years ago

Which of the following is inversely proportional to the gravitational force between two masses?

Mrrafil [7]

It is D, the distance between each object squared. We get this from solving for the force of gravity, which is

F = G((m1*m2)/(r^2)).

Here, you can see that the masses of the two objects are divided by their total distance apart from each other (r) squared.

6 0

3 years ago

What happens to the electricity in a strand of

rodikova [14]

Answer:

Either all the lights are very old and need new ones or the cable is wet.

Explanation:

5 0

3 years ago

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