PHYSICS HIGH SCHOOL

22. The mechanical efficiency of any machine is always ____________________ than 100 percent.23. When a pole vaulter flexes the pole, the pole vaulter increases the pole’s ____________________ potential energy.

24. Wind turbines convert ____________________ energy into electrical energy.

Answers

Answer 1
Answer: 22. less
23. elastic
24. wind
hope it helps
Answer 2
Answer:

Explanation :22  The mechanical efficiency of any machine is always less than 100 percent.

23. When a pole vaulter flexes the pole, the pole vaulter increases the pole’s elastic potential energy.

24.  Wind turbines convert wind energy into electrical energy.

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Imagine that you are working as a roller coaster designer. You want to build a record breaking coaster that goes 70.0 m/s at the bottom of the first hill. You estimate that the efficiency of the tracks and cars you are using 90.0%. How high must the first hill be?
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Which "sphere" does an astronomer most directly study?a. biosphere
b. exosphere
c. geosphere
d. cryosphere E. atmosphere F. hydrosphere

Answers

I would choose B. exosphere. Astronomers study outer space, planets and ect.

Answer:

exosphere

Explanation:

exosphere is space

astronomy is space

5.25 calories are absorbed by an iron nail. How many joules is this?

Answers

1 kilo-calorie= 4184 joules
0.001 kilo-calorie= 1 calorie

therefore 5.25 calorie=21.966 joules

Answer : 5.25 Calories is equivalent to 21.966 Joules.

Explanation :

The capacity to do any work is called its energy. Its SI unit is joules. Another unit of energy is joules.

The relation between the calorie and the joule is :

1\ calorie=4.184\ J

To convert 5.25 calories to joules we have to use unitary method i.e.

5.25\ calories=5.25* 4.184\ J

So, 5.25 C = 21.966 Joules.

Hence, this is the required solution.                     

The small particles that produce a streak of light upon entering earth’s atmosphere are called

Answers

They are called meteors... i just took the test

Explanation:

When a meteoroid enters the earth's atmosphere at high speed, a streak of light called meteor is observed. This light effect is produced by the ionization of air molecules in the upper atmosphere (at altitudes from 76 to 100 km). Most of these are the size of a grain of sand.

What is the force required to produce an acceleration of 46.4

Answers

That depends on the mass of the object, and the unit of the '46.4' .

If the '46.4' is ' meters per second² ' , then the force required is

       (mass of the object in kilograms) x (46.4)    newtons .

An emergency relief plane is dropping a care package from a plane to a group of medical personnel working for a relief agency in an African village. The package is designed to land in a small lake, inflate an attached raft upon impact, and finally resurface with the raft side down. The plane will be moving horizontally with a ground speed of 59.1 m/s. The package will be dropped a horizontal distance of 521 m from the intended target location. At what altitude above the pond must the plane be flying in order to successfully accomplish this feat?

Answers

Answer:

The altitude of the plane is 379.5 m.

Explanation:

Initial horizontal velocity, u = 59.1 m/s

Horizontal distance, d = 521 m

let the time taken by the packet to cover the distance is t.

Horizontal distance = horizontal velocity x time

521 = 59.1 x t

t = 8.8 s

let the vertical height is h .

Use second equation of motion in vertical direction.

h = u t + 0.5 gt^2\n\nh = 0 + 4.9 * 8.8*8.8\n\nh= 379.5 m

Final answer:

The plane must be flying at an altitude of approximately 194.89 m above the pond.

Explanation:

To successfully drop the care package in the small lake, the plane must be flying at a certain altitude above the pond. We can use the horizontal distance and the ground speed of the plane to calculate the time it takes for the package to reach the target location. Then, using the time and the equation for free fall, we can find the altitude above the pond.

First, we calculate the time it takes for the package to reach the target location:

  1. Horizontal distance = 521 m
  2. Ground speed = 59.1 m/s
  3. Time = Horizontal distance / Ground speed = 521 m / 59.1 m/s = 8.81 s

Next, we use the equation for free fall to find the altitude above the pond:

  1. Acceleration due to gravity, g = 9.8 m/s^2 (assuming no air resistance)
  2. Time for free fall, t = 8.81 s
  3. Altitude above the pond = 0.5 * g * t^2 = 0.5 * 9.8 m/s^2 * (8.81 s)^2 = 194.89 m

Therefore, the plane must be flying at an altitude of approximately 194.89 m above the pond in order to successfully accomplish this feat.

Learn more about altitude above the pond here:

brainly.com/question/18722834

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If the pitch of the sound coming out from a speaker increases, which is true about the sound wave?

Answers

If the pitch of a sound increases, then we know that its frequency
has increased, and its wavelength has decreased.

Answer:

B

Explanation:

Because If the pitch of a sound increases, then we know that its frequency  

has increased, and its wavelength has decreased.
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