PHYSICS HIGH SCHOOL

If two swimmers compete in a race, does the faster swimmer develop more power?

Answers

Answer 1
Answer: Power is equal to energy per unit time. In this case, power is proportional to energy while is inversely proportional to time,on the other hand. Given the two swimmers exerts same amount of energy but the faster swimmer just does things in faster time, then the faster swimmer should develop more power from shorter time

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A lake several streams and rivers that take water away from it.  Does the lake contain freshwater or saltwater?

Answers

It contains fresh water.

What is the energy of work done lifting 2kg mass rocket to a height of 130 m

Answers

Work done to lift the mass is given by

W = mgH

here we know that

m = mass = 2 kg

g = acceleration due to gravity = 9.8

H = height = 130 m

now using the above equation we can write

U = 2* 9.8 * 130

U = 2548 J

so the energy required to do the work is 2548 J
work done = force × distance travelled in the direction of the force
Force= 2(9.81) = 19.62N
WD= 19.62×130= 2550.6Nm

The earth system concept emphasizes which of the following? Question 2 options: how everything on the earth is interconnected how you can study each system in isolation the concept that the earth is round how the earth's systems came about

Answers

The earth system concept emphasizes on how everything on the earth is interconnected. Earth system in terms of four central components known as the subsystems – the hydrosphere,geosphere, atmosphere and biosphere. I hope the answer helps. Thanks! 

Which rocky planet has the strongest magnetosphere?A) Mars
B) Earth
C) Mercury
D) Venus

Answers

earth it has the strongest magnetosphere

An object-spring system undergoes simple harmonic motion. if the mass of the object is doubled, what will happen to the period of the motion?

Answers

The period of simple harmonic motion remains unchanged when the mass of the object is doubled.

What is simple harmonic motion?

Simple harmonic motion (SHM) is a type of periodic motion where an object oscillates back and forth around a fixed point in a regular and repeated manner. It is a special case of periodic motion, characterized by a restoring force that is proportional to the displacement from the equilibrium position. The classic example of SHM is a mass-spring system, where a mass is attached to a spring and is subjected to a restoring force proportional to the displacement from its rest position.

In SHM, the motion is always sinusoidal and the period of the motion is constant, which means that the time for one complete cycle of the motion remains the same. This type of motion is important in a variety of physical systems, including the vibration of mechanical systems, the oscillations of electrical circuits, and the motion of particles in a gravitational field.

Learn more about simple harmonic motion, here:

brainly.com/question/28208332

#SPJ6
T ⇒ √2T

T = 2π √(m/k)

T period
m mass
k spring constant

In a practical machine, the power output is _______ the power input. A. larger than
B. multiplied by
C. equal to
D. smaller than

Answers

The correct answer for the question that is being presented above is this one: "D. smaller than." In a practical machine, the power output is smaller than the power input. The power output is smaller than the power input as most of the energy usually has been converted to heat in the process.

Smaller than is the correct answer
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