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3 years ago

Why are the coldest places on earth found near the poles

1 answer:

6 0

Polar regions do not receive direct sunlight during the winter months due to the tilt in the Earth's axis. Hence, polar regions can get very cold. Antarctica is the coldest place on Earth. The coldest places on Earth tend to be located near the poles. Hope this answers the question.

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At a given instant, the force on an electron is in the +z-direction (out of the page), which the electron is moving in the +x-di

Hitman42 [59]

Answer:

The direction of the B-field is in the +y-direction.

Explanation:

The corresponding formula is

$F_B = qv\times B$

This means, we should use right-hand rule.

Our index finger is pointed towards +x-direction (direction of velocity),

our middle finger should point towards the direction of the B-field,

and our thumb should point towards the +z-direction (direction of the force).

Since our middle finger in this situation points towards +y-direction, the B-field should be in +y-direction.

$\^{x} \times \^{y} = \^{z}$

3 0

4 years ago

A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0, assuming negligible air resistance?

Bess [88]

If the ball travels 19.6 meters every second and it travels for 3 seconds, obviously you have to multiply the velocity by 3:

19.6 x 3= 58.8m/s

5 0

3 years ago

Read 2 more answers

Bambi is walking along the train tracks when he suddenly notices a fast approaching train and freezes in his tracks like a deer

Dmitrij [34]

Answer:

The final speed of the train and Bambi after collision is 7.44 m/s

Explanation:

Given;

mass of the train, m₁ = 1000kg

mass of Bambi, m₂ = 75kg

initial speed of the train, u₁ = 8 m/s

initial speed of Bambi, u₂ = 0 m/s

If Bambi gets stuck to the front of the train, then the collision is inelastic.

m₁u₁ + m₂u₂ = v(m₁ + m₂)

where;

v is the final speed of the train and Bambi after collision

Substitute the given values and solve for v

1000 x 8 + 75 x 0 = v (1000 + 75)

8000 = v (1075)

v = 8000/1075

v = 7.44 m/s

Therefore, the final speed of the train and Bambi after collision is 7.44 m/s

8 0

3 years ago

A disk rotates freely on a vertical axis with an angular velocity of 30 rpm. An identical disk rotates above it in the same dire

Maslowich

Answer:

The final angular velocity of the disks is 25 rpm.

Explanation:

Given that,

Angular velocity $\omega_{1}= 30\ rpm$

Angular velocity $\omega_{2}=20\ rpm$

We need to calculate the angular velocity

Using formula of angular momentum

$L=I\omega$

Before the drop, the angular momentum of the system

$L_{s}=I\omega_{1}+I\omega_{2}$

$L_{s}=I(\omega_{1}+\omega_{2})$

$L_{s}=I(30+20)$

$L_{s}=I(50\ rpm)$ ....(I)

When both disk rotates together then the total moment of inertia is twice the inertia of one disk

$L_{s}=2I\omega$

From equation (I)

$2I\omega=I\times50$

$\omega=25\ rpm$

Hence, The final angular velocity of the disks is 25 rpm.

7 0

3 years ago

Wave motion is characterized by two velocities: the velocity with which the wave moves in the medium (e.g., air or a string) and

Effectus [21]

Answer with Explanation:

We are given that the mathematical form of wave

$y(x,t)=Asin(kx-\omega t)$

a.We have to find the speed of propagation of this wave

In given mathematical form

k=Wave number

$\omega$ =Angular frequency

A=Amplitude

We know that

Speed of propagation of the wave= $v_p=\frac{\omega}{k}$

b.Differentiate w.r.r t

$v_y(x,t)=-A\omega cos(kx-\omega t)$

The velocity $v_y(x,t)$ of a point on the string as a function of x and t is given by

$v_y(x,t)=-A\omega cos(kx-\omega t)$

8 0

3 years ago