1. What is the kinetic energy of an object with a mass of 50kg and a velocity of 30m/s?

Two particles of charge q1 and q2, respectively, move in the same direction in a magnetic field and experience the same magnetic

ohaa [14]

Answer:

|q1| / |q2| = 1/7

Explanation:

We are told that both particles are in the same magnetic field, B.

The charge of the first particle is q1

The charge of the second particle is q2

Let the speed of particle 1 be v1.

Let the speed of particle 2 be v2.

The magnetic force acting on particle 1 due to the magnetic field, B, is:

F1 = |q1| * v1 * B

The magnetic force acting on particle 2 due to the magnetic field, B, is:

F2 = |q2| * v2 * B

We are told that both particles experience the same magnetic force. This means that F1 = F2

Therefore:

|q1| * v1 * B = |q2| * v2 * B

=> |q1| * v1 = |q2| * v2

|q1| / |q2| = v2/v1

We are told that the speed of particle 1 is seven times that of particle 2. Hence:

v1 = 7 * v2

Hence:

|q1| / |q2| = v2 / (7 * v2)

|q1| / |q2| = 1/7

4 0

3 years ago

The colored lines in the figure represent paths taken by different people walking around in a city. Assume that each city block

jarptica [38.1K]

Answer: 592.37m

Explanation:

Person D is the blue line.

The total displacement is equal to the difference between the final position and the initial position, if the initial position is (0,0) we have that he first goes down two blocks, then right 6 blocks. then up 4 blocks, then left 1 block.

Now i will considerate that the positive x-axis is to the right and the positive y-axis is upwards.

Then the new position will be, if B is a block:

P =(6*B - 1*B, -2*B + 4*B) = (5*B, 2*B)

And we know that B = 110m

P = (550m, 220m)

Now, then the displacement will be equal to the magnitude of our vector, (because the difference between P and the initial position is equal to P, as the initial position is (0,0)) this is:

P = √(550^2 + 220^2) = 592.37m

4 0

4 years ago

A 2 kg toy car moves at a speed of 5 m/s. If a child applies a 5N force for 2 m in the same direction the car is already moving,

WITCHER [35]

Answer:

$10\: \mathrm{J}$

Explanation:

The kinetic energy of an object is $KE=\frac{1}{2}mv^2$ , where $m$ is the mass of the object and $v$ is the velocity of the object.

The toy car's initial kinetic energy is $KE_{i}=\frac{1}{2}\cdot 2\cdot 5^2=25\: \mathrm{J}$ .

After the child applies a 5N force on it in the same direction, its velocity will increase but its mass will stay the same.

To find the final velocity of the toy car, we can use kinematic equation $v_f^2=v_i^2+2a\Delta x, \\ v_f=\sqrt{v_i^2+2a\Delta x}$

We are given $v_i=5\: \mathrm{m/s}$ and $\Delta x = 2\: \mathrm{m}$ .

To find acceleration:

$F=ma, a=\frac{F}{m}=\frac{5}{2}=2.5\: \mathrm{m/s^2}$ .

Now substitute $v_i=5\: \mathrm{m/s}, \: a=2\: \mathrm{m/s^2}, \: \Delta x = 2\: \mathrm{m}$ into $v_f=\sqrt{v_i^2+2a\Delta x}$ to get $v_f\approx 5.92\: \mathrm{m/s}$ .

Using this, we can find the final kinetic energy of the toy car is $KE_f=\frac{1}{2}\cdot 2\cdot 5.92^2$ .

Thus, the change in kinetic energy is $KE_f-KE_i=\frac{1}{2}\cdot2\cdot 5.92^2-\frac{1}{2}\cdot 2\cdot 5^2=\fbox{$10\: \mathrm{J}$}$ (one significant figure).

4 0

3 years ago

Please help have due very soon?thank you

Andru [333]

The answer is :78 I think

8 0

3 years ago

How does water heat the earth

Sergeeva-Olga [200]

Answer:

Explanation:

The main source of ocean heat is sunlight. Additionally, clouds, water vapor, and greenhouse gases emit heat that they have absorbed, and some of that heat energy enters the ocean. ... Thus, heat energy in the ocean can warm the planet for decades after it was absorbed.

7 0

3 years ago