What type of lens is used to make objects appear smaller and clearer convex or concave?

Answers

Answer 1

Answer: The answer is Concave lenses

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A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball?
Could someone please explain isotopes, and what they do/are? If not thats fine, thank you
A place kicker must kick a football from a point 36.0 m from the uprights. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with an initial speed of 20 m/s at an angle of 53° to the horizontal. By how much does the ball clear or fall short of clearing the crossbar?
Explain why plastic comb rubbed with wool attracts pieces of paper
You use a 1200-watt hair dryer for 10 minutes each day. a. How many minutes do you use the hair dryer in a month? (Assume there are 30 days in the month.) b. How many hours do you use the hair dryer in a month? c. What is the power of the hair dryer in kilowatts? d. How many kilowatt-hours of electricity does the hair dryer use in a month? e. If your town charges $0.15/kWh, what is the cost to use the hair dryer for a month?

Fluid pressure ____________ as depth ____________.a. decreases, increases
c. increases, increases
b. decreases, decreases
d. both b and c are correct

Answers

c. The deeper you go below the fluid's surface the more matter is pressing downward on that point, so the greater the pressure.

Which of the following materials allows charges to flow easily?A. wood
B. an electrical conductor
C. glass
D. an electrical insulator

Answers

Answer: Option (B) is the correct answer.

Explanation:

A conductor which allows the quick or easy movement of charges through it is known an electrical conductor.

For example, copper is a good conductor of heat and electricity.

Whereas wood is a non-conductive substance as it does not allow the movement of charges through it. Thus, wood is a non-conductive in nature.

Glass is a poor conductor of electricity as it inhibits the flow of free movement of electrons through it.

Insulators are the substances or material in which there is also no movement of electric charges or very little movement of electric charges.

Thus, we can conclude that out of the given options, an electrical conductor allows charges to flow easily.

the correct answer is b

A turntable is designed to acquire an angular velocity of 32.4 rev/s in 0.5 s, starting from rest.Find the average angular acceleration of the turntable during the 0.5 s period.
Answer in units of rad/s2

Answers

Well, the acceleration is the difference of speeds divided by the time period. $(32.4)/(0.5)=64.8rev/s^2$ .
One rev/s is $2\pi rad/s^2$ , so our final result is $64.8*2\pi=407.15rad/s^2$ .

Answer:

not sure lol

Explanation:

ummmmmm look it up on peersanswer.com

At what phase or phases could water exist at 4.579mm pressure and 0.0098°C?A) solid phase
B) liquid phase
C) solid, liquid and gas phases
D) no phases are present at this point

Answers

The correct answer is A. The water at this conditions is in the solid phase. This can be verified by using a phase diagram. A phase diagram is a figure which shows the phases of a certain substance at a specific temperature and pressure.

Answer:

The answer is C) solid, liquid and gas phases

Explanation:

This point is called the triple point bc solid, liquid, and gas phases can exist together.

hope this helps :)

A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and freuency of 2.55 Hz.(a) what's the maximum speed of the needle ?
(b) what's the maximum acceleration of the needle ?

Answers

Answer:

The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

Explanation:

Given that,

Frequency = 2.5 Hz

Amplitude = 1.27 cm

(a). We need to calculate the time

The frequency is the reciprocal of the time.

The time taken from highest point to lowest point

(b). We need to calculate the time

The time taken in one cycle = 0.4 sec

The distance covered in one sec= 4 times x amplitude

We need to calculate the speed

Using formula of speed

We need to calculate the time

Hence, The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

If there is no difference in the dry and wet bulb, you can assume that the relative humidity is __________.a. 100%
b. 75%
c. 50%
d. 0% E. It cannot be determined.

Answers

If there is no difference in the dry and wet bulb temperatures,
you can assume that the relative humidity is 100% . . . since
no water was able to evaporate from the wet bulb.

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The length of some fish are modeled by a von Bertalanffy growth function. For Pacific halibut, this function has the form L(t) = 200(1 – 0.956e–0.18t ) where L(t) is the length (in centimeters) of a fish t years old.(a) Find the rate of change of the length as a function of time

The work done in lifting an apple one meternear Earth’s surface is approximately(1) 1 J (3) 100 J(2) 0.01 J (4) 1000 J

The horsepower (hp) that a shaft can safely transmit varies jointly with its speed, in revolutions per minute (rpm), and the cube of the diameter. If the shaft of a certain material 3 inches in diameter can transmit 46 hp at 100 rpm, what must the diameter be in order to transmit 74 hp at 175 rpm?

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