PHYSICS HIGH SCHOOL

A particle moves in a straight line with constant speed of 4 m/s for 2 s, then with 6 m/s for 3 s. The average speed of the particle in the given time interval be v. Find [v].(where, [ ] is step integer function)

Answers

Answer 1

Answer:

Answer:

Explanation

Total time, T=2+3=5 s

Total distance, D=4×2+6×3=26 m

Thus, average speed=D/T=26/5=5.2

Thus, [x]=5

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Energy waves traveling at the speed of light are called _____.conduction particlesconvection wavesradiationatomic energy
What does the doppler effect tell astronomers about the universe
A compact disc has a radius of 6 centimeters.a. What is its circumference in meters? b. If the cd rotates 4 times per second, what is the linear speed of a point on the outer edge of the cd? Give your answer in meters per second. c. What is the linear speed of a point 3 centimeters from the center of the cd? (Assume the angular speed has not changed).

A failure of the red-sensitive nerves in the eye to respond to light properly causes A. astigmatism.
B. farsightedness.
C. chromatic aberration.
D. color blindness.

Answers

D. colour blindness

"red-sensitive" just means that the nerves are able to see red light

D. Color blindness is your correct answer

You should vary your ____________ based on the size and noise level of the venue you are speaking in.

Answers

I think, the best word to fill the blank is "voice". You should vary your voice based on the size and noise level of the venue you are speaking in. Because when you are speaking you use your voice to be heard. Also, it is the only thing you can vary depending on the size and the noise when speaking in a certain location.

Answer:

Explanation:

A pair of scientists proposes two different theories to explain the same set of observations. Which of the following best explains the value of these competing theories?Competing theories can be a source of new, testable ideas.
Competing theories are necessary to transform a theory into a law.
Competing theories generate controversy that helps popularize ideas.
Competing theories allow scientists to combine the most interesting aspects of both theories.

Answers

Answer:

Competing theories can be a source of new, testable ideas.

Explanation:

Theory is the set of knowledge that seeks to explain, with a high degree of accuracy, all-encompassing phenomena of nature, that is, it is different from the meaning of the word "theory" used in everyday life, when we say that something "is only a theory "in the sense that it is a mere speculation.

Competing theories present a much larger set of knowledge, which gives the universe a source of new and testable ideas

Competing theories can be a source of new, testable ideas.

What is the smallest value of the force F such that the 8.0 kg block will not slide down the wall? The coefficient of static friction between the block and the wall is 0.4.Select one:

a. 10N

b. 100N

c. 200N

d. 98N

Answers

The smallest value of the force that will make the block not to slide down is 10 N.

We'll begin by calculating the normal reaction. This can be obtained as follow:

Mass (m) = 8 Kg

Acceleration due to gravity (g) = 10 m/s²

Normal reaction (N) =?

N = mg

N = 8 × 10

N = 80 N

Finally, we shall determine the frictional force.

Coefficient of friction (μ) = 0.4

Normal reaction (N) = 80 N

Frictional Force (F) =?

F = μN

F = 0.4 × 80

F = 32 N

Since the frictional force is 32 N, therefore, a force lesser than the frictional force will make the blocknot to slide down.

From the options given above, only option A has a force that is lesserthan the frictional force.

Therefore, the correct answer to the question is Option A. 10 N

Learn more about frictional force:

brainly.com/question/20049999

Final answer:

The smallest value of the force that will not slide the 8.0 kg block down the wall is 31.36 N.

Explanation:

To determine the smallest value of the force such that the 8.0 kg block will not slide down the wall, we need to consider the static friction between the block and the wall. The formula for static friction is fs = μs * N, where μs is the coefficient of static friction and N is the normal force. In this case, the normal force is equal to the weight of the block, which is mg = 8.0 kg * 9.8 m/s^2 = 78.4 N. Therefore, the smallest value of the force is equal to the maximum static friction force, which can be calculated as fs = 0.4 * 78.4 N = 31.36 N. So the correct answer is 31.36 N.

Learn more about Static Friction here:

brainly.com/question/13000653

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HELP NEEDED! Determine the mechanical energy of this object: a 1-kg ball rolls on the ground at 2 m/s. A. The ball is on the ground, so the mechanical energy is zero.
B. 2 J
C. 1 J
D. 4 J

Answers

The mechanical energy of an object is the sum of its potential and kinetic energy.

Because the ball is on the ground, its potential energy is 0.
Its kinetic energy is given by:

K.E = 1/2 mv²
K.E = 1/2 x 1 x 2²
K.E = 2 J

Mechanical energy = 2 + 0
Mechanical energy = 2 J

The answer is B.

I think it's 2 J. Hope I helped :)

A fastball pitcher can throw a baseball at a speed of 40 m/s (90 mi/h). (a) Assuming the pitcher can release the ball 16.7 m from home plate so the ball is moving horizontally, how long does it take the ball to reach home plate? (b) How far does the ball drop between the pitcher’s hand and home plate?