PHYSICS HIGH SCHOOL

Calculate the potential energy of an object with a mass of 15 kg while sitting on a shelf that his 20 m high

Answers

Answer 1
Answer:

Answer:

2943J

Explanation:

Ep = mgh

given that,

m = 15kg

h= 20m

and

g = 9.81 m/s^2

Ep= 15 × 9.81 × 20

Ep= 2943J

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Water enters a baseboard radiator at 180 °F and at a flow rate of 2.0 gpm. Assuming the radiator releases heat into the room at a rate of 20,000 Btu/ hr., what is the temperature of the water leaving the radiator?
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At what stage of a reaction do atoms have the highest energy?a. reactant stage b. product stage c. transition state stage d. The stage of highest energy depends on the atom.
Two diverging light rays, originating from the same point, have an angle of 5° between them. After the rays reflect from a plane mirror, what is the angle between them? Construct one possible ray diagram that supports your answer.

What is the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s?

Answers

Kinetic energy = (1/2) (mass) (speed)²

                         = (1/2) (1.4 kg) (22.5 m/s)²

                         =    (0.7 kg)  (506.25 m²/s² )

                         =          354.375  kg-m²/s²  =  354.375 joules .

This is just the kinetic energy associated with a 1.4-kg glob of
mass sailing through space at 22.5 m/s.  In the case of a frisbee,
it's also spinning, and there's some additional kinetic energy stored
in the spin. 

Which soil horizon is located closest to the earth's crust? O horizon A horizon B horizon C horizon

Answers

The C horizon because it lays on the hard bedrock of the earths crust.
The soil horizon located closest to the surface of the earth's crust would be the O Horizon, which consists of organic deposits (hence the O) and composting plant structures.
Hope that helped =)

_______ is the idea that people should be more interested in advancing their lives on earth than in worrying about getting to heaven

Answers

The correct answer for the question that is presented is this one: "Theology." Theology is the idea that people should be more interested in advancing their lives on earth than in worrying about getting to heaven. Studying Theology requires a lot of faith from the learner.

BAlpha Centauri has an apparent magnitude of -0.27, whereas the apparent
magnitude of Alpha Crucis is 0.77. Identify which star appears brighter when observed from
Earth. Explain your answer.

Answers

Answer:

Alpha centauri will be brighter than Alpha Crucis .

Explanation:

Apparent magnitude of a star measures how bright a star is .

This scale is reverse logarithmic ie , the brighter  the  star , the lower is its magnitude . A magnitude equal to 5 scale higher represents less magnitude by a factor of 1/ 100 . In this way a difference of 1 magnitude represents a brightness ratio of 2.512 . Hence a star of brightness magnitude of 7 is less bright by a factor 2.512  than that of a star magnitude of 6 .

A window washer who does not want to change his position will want the forces acting on him to be ____________. a. balanced
b. large
c. small
d. unbalanced

Answers

Before solving this question first we have to understand Newton's  first law of motion

As per Newton's first law it is impossible to change the state of rest or uniform motion along a straight line unless and until it is compelled by some external unbalanced forces.

Everybody tends to oppose the change of state of rest due to  their inertia.A book present on a table pushes the table with its weight in vertically downward direction while table applies same amount of force on the book in vertically upward direction.The net force acting on each  body is zero.So the book will show no motion.

Actually  balanced force have no role in changing the state of rest of the body. Only unbalanced force will cause the body to move.

Hence the washer who does not want to change his position will want the force acting on him to be [balanced ].
a. balanced is the answer

A car with a mass of 1800 kilograms is traveling at a speed of 29 m/s on a horizontal flat road. Calculate the radius of its path. Which formula must be used to solve this?

Answers

Answer:

Explanation:

r = v^2 / g

where:

r is the radius of the path (in meters)

v is the speed of the car (in meters per second)

g is the acceleration due to gravity (in meters per second squared)

In this case, v = 29 m/s and g = 9.81 m/s^2. Therefore, the radius of the car's path is:

r = 29^2 / 9.81 = 82.5 meters

So the answer is 82.5
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