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3 years ago

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A wave travels from Medium 1 (light like slinky) into Medium 2 (heavy and rigid like snakey). Which property or properties of th

e wave is the same for both media

1 answer:

hjlf3 years ago

4 0

Answer:

ohhhhhhhhhhhhhhhhjhhhhhhh

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A man walks 30m to the west, then 5m to the east in 45 seconds. What was his displacement?

AleksandrR [38]

The displacement is the distance from the beginning point to the ending point. The time was just to throw you off. If he walks 30m due west, and then 5m due east, his displacement would be 30-5=25m to the west.

6 0

3 years ago

A carnot heat engine receives 600 kj of heat from a source of unknown temperature and rejects 175 kj of it to a sink at 20°c. de

oee [108]

(b) 71%

The thermal efficiency of a Carnot heat engine is given by:

$\eta = \frac{W}{Q_{in}}$

where

W is the useful work done by the engine

$Q_{in}$ is the heat in input to the machine

In this problem, we have:

$Q_{in}=600 kJ$ is the heat absorbed

$W=600 kJ-175 kJ=425 kJ$ is the work done (175 kJ is the heat released to the sink, therefore the work done is equal to the difference between the heat in input and the heat released)

So, the efficiency is

$\eta = \frac{425 kJ}{600 kJ}=0.71 = 71\%$

(a) $737^{\circ}C$

The efficiency of an engine can also be rewritten as

$\eta = 1-\frac{T_C}{T_H}$

where

$T_C$ is the absolute temperature of the cold sink

$T_H$ is the temperature of the source

In this problem, the temperature of the sink is

$T_C = 20^{\circ}C + 273=293 K$

So we can re-arrange the equation to find the temperature of the source:

$T_H = \frac{T_C}{1-\eta}=\frac{293 K}{1-0.71}=1010 K\\T_H = 1010 K - 273=737^{\circ}C$

7 0

3 years ago

Newton's third law of motion involves:

madreJ [45]

Answer:

B

Explanation:

There are a pair of forces acting on the 2 interacting objects

You're welcome <3

8 0

3 years ago

What is the best example of forces acting in the same direction?

Tanya [424]

Answer:

Two football players pushing a tackling shed

Explanation:

They're working together to push it. (I also answered this and that was the correct answer)

8 0

3 years ago

Read 2 more answers

Need quite a bit of help

Gnom [1K]

When the cart was at Table

Normal reaction (N)=mg

Now acceleration due to gravity acting on the gravity.

When the air comes out of straw it tries to take the cart upwards.
But the force is equal to that of acceleration due to gravity but in opposite direction.

Hence.

$\\ \sf\Rrightarrow F_{net}=0N$

So the cart doesn't move

3 0

3 years ago