All categories

4 years ago

Which best describes what happens to sunlight after passing through the keyhole of a door

1 answer:

7 0

Given the answers I would say B, Is your best choice because when the light goes through a hole it spreads out, because most light rays (<) outward.

You might be interested in

Two particles with the same charge will repel each other. True or false

FinnZ [79.3K]

True. Think of a magnet and how they only connect to the opposite charges.

7 0

4 years ago

A car movingin a straight line starts at x = 0 at t = 0. It passes the point x = 25.0 m with a speed of 11.0 m????s at t = 3.00s

makvit [3.9K]

Answer:

Part a)

at t = 3.00 s

$v = 8.33 m/s$

at t = 20.0 s

$v = 19.25 m/s$

Part b)

at t = 3.00 s

$a = 3.67 m/s^2$

at t = 20.0 s

$a = 2.25 m/s^2$

Explanation:

The car starts at x = 0

Part a)

Now at t = 3.00 s

the position of the car is given as x = 25 m and its speed is given as v = 11 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{25 - 0}{3}$

$v = 8.33 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{11 - 0}{3}$

$a = 3.67 m/s^2$

Part b)

Now at t = 20.0 s

the position of the car is given as x = 385 m and its speed is given as v = 45 m/s

Now for average velocity we have

$v = \frac{displacement}{time}$

$v = \frac{385 - 0}{20}$

$v = 19.25 m/s$

Now for average acceleration we have

$a = \frac{v - 0}{t}$

$a = \frac{45 - 0}{20}$

$a = 2.25 m/s^2$

4 0

3 years ago

Why do you think compound machines are sometimes called complex machines

Maksim231197 [3]

Answer:

i think maybe because it has more than 6 or 5 parts.

3 0

4 years ago

The medium seismic waves travel through is

Natalija [7]

Answer:

rocks and other materials inside the Earth. 5.

Explanation:

5 0

3 years ago

Read 2 more answers

Consider a heat engine that inputs 10 kJ of heat and outputs 5 kJ of work. What are the signs on the total heat transfer and tot

Oksi-84 [34.3K]

Answer:

Total heat transfer is positive

Total work transfer is positive

Explanation:

The first law of thermodynamics states that when a system interacts with its surrounding, the amount of energy gained by the system must be equal to the amount of energy lost by the surrounding. In a closed system, exchange of energy with the surrounding can be done through heat and work transfer.

Heat transfer to a system is positive and that transferred from the system is negative.

Also, work done by a system is positive while the work done on the system is negative.

Therefore, from the question, since the heat engine inputs 10kJ of heat, then heat is being transferred to the system. Hence, the sign of the total heat transfer is positive (+ve)

Also, since the heat engine outputs 5kJ of work, it implies that work is being done by the system. Hence the sign of the total work transfer is also positive (+ve).

5 0

3 years ago