Which statement describes characteristics of a concave lens? A concave lens diverges light and curves inward. A concave lens diverges light and curves outward. A concave lens converges light and curves inward. A concave lens converges light and curves outward.

Answers

Answer 1

Answer:

The correct answer is

A concave lens diverges light and curves inward.

A picture of a concave lens and the ray diagram produced by it can be seen in attachment. As it can observed, the concave lens (also called diverging lens) is wider at the edges and narrow at the centre (so, it curves inward), and it can also be seen that the lens diverges the incoming light rays.

Answer 2

Answer:

A concave lens diverges light and curves inward is the statement which

describes its characteristics.

What is a Concave lens?

This type of lens is used to treat short-sightedness and has at least one of

its surface curving inward. This helps it to spread out light rays so as to

ensure proper view.

It has a high degree of diffraction and is the reason why option A was

chosen as it's the most appropriate choice.

Read more about Concave lens here brainly.com/question/3140453

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A machine does 1,500 joules of work in 30 seconds. What is the power of this machine?

Answers

the power of the machine is 50

Under what condition is the instantaneous acceleration of a moving body equal to its average acceleration over time?A. only at positive accelerations

B. only at negative accelerations

C. only at zero acceleration

D. only at constant accelerations

Answers

If the acceleration is constant (negative or positive) the instantaneous acceleration cannot be

Average acceleration: [final velocity - initial velocity ] /Δ time

Instantaneous acceleration = d V / dt =slope of the velocity vs t graph

If acceleration is increasing, the slope of the curve at one moment will be higher than the average acceleration.

If acceleration is decreasing, the slope of the curve at one moment will be lower than the average acceleration.

If acceleration is constant, the acceleration at any moment is the same, then only at constant accelerations, the instantaneuos acceleration is the same than the average acceleration.

Constant zero acceleration is a particular case of constant acceleration, so at constant zero acceleration the instantaneous accelerations is the same than the average acceleration: zero. But, it is not true that only at zero acceleration the instantaneous acceleration is equal than the average acceleration.

That is why the only true option and the answer is the option D. only at constant accelerations.

What happens to an earthquake's S-waves when they strike the core?A) They bounce off
B) They are absorbed
C) The change into P-waves
D) They change into L-waves

Answers

Answer:

B) They are absorbed

Explanation:

B is correct because S waves can only travel through solid materials. When they hit liquid materials they are absorbed in and undetectable.

Answer:

B) They are absorbed

Explanation:

When they hit the liquid core, S-waves are no longer able to be detected. While P-waves bounce off the liquid core, S-waves are absorbed at the core.

The work done by an engine equals one-fourth the energy it absorbs from a reservoir. True or False

Answers

True IF the engine is 25% efficient. False otherwise.

You have a 2.00 kg block of lead. Lead melts at 327.5°C. Cpb = 130.0 J/kg*C and ?Hj for lead is 2.04x10^4 J/kg . Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

Answers

Answer:

$1.2\cdot 10^5 J$

Explanation:

1) First of all, we need to calculate the heat needed to raise the temperature of the block of lead from the initial temperature (25.0 C) to the melting temperature (327.5 C). This heat is given by the equation

$Q_1 = m C_(pb) \Delta T$

where

m = 2.00 kg is the mass of the block

Cpb = 130.0 J/kg*C is the specific heat capacity of lead

$\Delta T=327.5 C-25.0 C=302.5 C$ is the temperature difference

Substituting,

$Q_1 = (2.00 kg) (130 J/kgC) (302.5 C)=7.87\cdot 10^4 J$

2) Now we have to calculate the amount of heat needed to completely melt the lead, which is given by:

$Q_2 = m Hj$

where

Hj = 2.04x10^4 J/kg is the latent heat of fusion of lead

Substituting,

$Q_2 = (2.00 kg)(2.04\cdot 10^4 J/kg)=4.08\cdot 10^4 J$

3) Therefore, the total heat needed is

$Q=Q_1+Q_2=7.87\cdot 10^4 J+4.08\cdot 10^4 J=1.2 \cdot 10^5 J$

Answer:

Q = 2.00kg x 130 J/kgC x 302.5C

Q = 7.87 x 10^4j

Q = 2.00kg x 2.04 x 20^4

Q= 4.08 x 10^4

Q = 7.87 x 10^4j + 4.08 x 10^4 = 1.2 x 10^5j

Explanation:

Fill in the term that completes the statement.The current that we use in our homes is
current

Answers

Answer:

Look at the picture

Explanation:

Answer:Correct ans is alternating current(AC CURRENT)

Explanation:Most houses in the U.S use alternative current for lights,fridges e.t.c that why when you turn of a switch in a room that particular rooms light goes off it doesn't affect the other rooms like what a direct current will do

Well how about direct current you Ask?

direct currents are also used in most homes examples are door alarms smoke detectors e.t.c

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