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3 years ago

Please Help me with this problem

Physics

1 answer:

Tasya [4]3 years ago

3 0

Answers:

1) I saw a jogger whose velocity was about 3 m/s going straight North.

2) A car passed me at a velocity of almost 45 mles per hour, straight South.

3) I saw a dog chasing a cat. The cat was runing at about 40 km/h, but the dog barely reached 32 km/h, both 30° North of the East.

Explanation:

Velocity is a vector and so you must report it using the magnitude and the direction.

Velocity has units of distance (meter, kilometer, miles, among others) divided by units of time (second, minutes, hours, among others).

The magnitude of velocity is also called speed, and you calculate speed (average speed) as per the formula Speed = distance / time.

The velocities described above have these meanings:

Velocity Magnitude (speed) units direction

3 m/s going North 3 m/s m/s North

45 m.p.h hour, South 45 miles per hour miles/h South.

40 km/h 30° North of East 40 km/h km/h 30° North of East

40 km/h 30° North of East 35 km/h km/h 30° North of East

Remeber, vectors, like velocity, must be describe by its magnitude and direction.

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Suppose a ray of light traveling in a material with an index of refraction n a reaches an interface with a material having an in

KATRIN_1 [288]

Answer: C and D

Explanation: One of the first rule for total internal reflection to occur is that the ray must move from a dense to a less dense medium, hence refractive index of medium a must be greater than that of b.

When a ray moves from a dense to a less dense medium, the refracted ray moves away from the normal thus increasing the size of the angle of refraction (total internal refraction occurs when the angle of refraction is 90° and the angle of incidence at this point is known as the critical angle), hence the angle of incidence must be greater than the critical angle.

These points verifies option C and D

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3 years ago

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Mashcka [7]

Hello!

Possible answer could be Organisms

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4 years ago

Read 2 more answers

Which statement best defines inertia? An object's motion is unaffected by any external forces acting upon it. An object responds

svetoff [14.1K]

Answer:

An object responds to a force by tending to move in the direction of that force

Explanation:

The inertia of a body can be defined with the help of Newton's second law

F = m a

Where F is the applied force, a is the acceleration of the body and m is the mass

the force and the acceleration are vectors that point in the same direction and m is a scalar constant that relates the two vectors, this scalar constant is called masses and it measures the resistance of the bodies to the change of motion.

From the previous statement we see that the statement that best describes inertia is:

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3 years ago

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Lina20 [59]

Answer:

D. The tea loses heat to the spoon causing the spoon to become warmer

Explanation:

When the silver spoon at a lower temperature than the tea, is added to the tea, it makes thermal contact. Hence, the heat transfer starts between the two until the equilibrium is reached. We know that the heat transfer takes place from the body with a higher temperature to a body with a lower temperature. As a result, the body with higher temperature loses heat and its temperature lowers down. While the body with a lower temperature gains heat and its temperature rises.

Therefore, the correct option is:

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3 years ago

A pendulum has a length of 2 m and a 30 kg mass hanging on the end. What is the period of the

anastassius [24]

Answer:

T = 2.83701481512 seconds

Explanation:

Hi!

The formula that you will want to use to solve this question is:

$T = 2\pi *\sqrt{\frac{L}{g} }$

T--> period

L --> length of the pendulum

g --> acceleration due to gravity (9.8m/s^2)

since we know that the mass of the bob at the end of the pendulum does not affect the period of the pendulum, we can go ahead and ignore that bit of information (unless, of course, the weight causes the pendulum to stretch)

so now we can plug in our given info into the formula above and solve!

T = 2*pi * sqrt(2/9.8)

T = 2.83701481512 seconds

*Note*

- I used 3.14 to pi, if you need to use a different value for pi (a longer version, etc) your answer will be slightly different

I hope this helped!

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3 years ago