A. Ears
B. Air
C. Water
D. Rocks

Answer:

a) The work done in raising the block up to 2.0 m is 137.2 joules

b) The power exerted by the string in pulling the box up the ramp is 68.6 watts

Explanation:

The question examines the relationship between work energy and power

The parameters of the pulled box are;

The mass of the box, m = 7.0 kg

The height to which the box is pulled, h = 2.0 m

The velocity at which the box is moving at the 2.0 m height = 6.0 m/s

The time if takes the box to reach the height of 2.0 m = 2.0 seconds

The acceleration due to gravity, 'g' is taken as approximately 9.8 m/s²

a) The work done in raising the block up to 2.0 m = The potential energy gained by the block

The potential energy gained by the block, P.E. = m·g·h

Therefore, we have;

The work done in raising the block up to 2.0 m = P.E. = m·g·h

By substituting the given values, we get;

The work done in raising the block up to 2.0 m = 7.0 kg × 9.8 m/s² × 2.0 m =  137.2 joules

b) Power = The rate of doing work

∴ Power, P = Work done/(Time takes for the work)

The work done in raising the block up to 2.0 m = 137.2 joules

The time if takes the box to reach the height of 2.0 m = 2.0 seconds

∴ The power exerted by the string in pulling the box up the ramp, 'P' is given as follows;

P = 137.2 joules/(2.0 seconds) = 68.6 watts

The power exerted by the string in pulling the box up the ramp, P = 68.6 watts.

Answer:

True

Explanation:

Answer:

In Newtonian mechanics, the gravitational energy possessed by a mass, because of the gravitational field produced by a second mass.

Explanation:

Answer: When objects fall to the ground, gravity causes them to accelerate.

Explanation: Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.

Answer:

thermal

Explanation:

Answer:

Atomic energy is produced from changes within the nucleus of an atom.

Answer:

nucleus

Explanation:

The answer is yes

They are isotopes.

Answer:

Name the 6 simple machines

1.Lever

2.Pulley

3.Screw

4.Axle

5.Wedge

6.Inclined plane

What is a joule and how is it abbreviated?

Abbreviation=J

A measurement of energy and work.

What is an input force?

Input force is the amount of effort used to push down on a road or pull on a rope in order to move the weight.

What is an output force?

output force is the force exerted on an object by a simple machine.

Answer:CADB

Explanation:

Answer:

Measles and Whooping Cough

Explanation:

I really hope so

Answer:

Hey

Explanation:

My bestfriend is the best ever person in my life.

Answer:

Best friend is that person which we share our feeling.

Answer:

D) Carbon Dioxide

Explanation:

I hope this is right!

Answer:

d

Explanation:

Answer:

It would be summer for someone living near location 3 on the Earth.

Explanation:

Answer:

A kangaroo hops 60 m to the east in 5 s. What is the kangaroo's average velocity? ... The kangaroo stops at a lake for a drink of water and then starts hopping again to the south. Each second, the kangaroo's velocity increases 2.5 m/s.

Answer:

Gravity

Explanation:

Gravity is a force that acts upon every single object on Earth.

Answer:

c

Explanation:

tbh I think it is c because of what the explanation says so

Answer:

D

Explanation:

because i got it right when guessing its d

Answer:

0.5 0c

Explanation:

yes yes yes yes

Answer:

D

Explanation: That is the lowest point in a cycle

Answer:

I just had a question the same as this.

The answer is: Points (B) & (F)!

Hope it helps! :D

Answer:

All music in the world, is form only two notes and those notes are described below in detailed explanation.

Explanation:

In the chromatic scale, there are basically seven central musical notes, designated A, B, C, D, E, F, and G. They individual express a separate pitch or frequency. For illustration, the "central" A note has a pitch of 450 Hz, and the "common" B note has a pitch of 495 Hz.

Varieties Of Musical Notes You Require To Understand

Semibreve (Whole Note)

Minim (Half Note)

Crotchet (Quarter Note)

All music, listened to in the world, is from only twelve (12) notes.

A music can be defined as the systematic combination of an instrumental sound and human vocals, in order to produce harmonious tunes or sounds.

A note can be defined as a symbol which is used to denote a musical sound with respect to its pitch and duration.

Basically, all the music that are available and listened to in the world are typically produced from only twelve (12) notes.

This ultimately implies that, any musical piece that you may have come across in this world comprises only twelve (12) notes and these include:

Read more: https://brainly.com/question/20245998

Answer:

north only

Explanation:

Answer:

1) It expresses the rate (top speed) at which it can move with time.

2) P = 20 W

3) h = 18 km

Explanation:

1) Power is the rate of transfer of energy.

⇒ Power = [tex]\frac{Energy(or workdone)}{Time}[/tex]

i.e P = [tex]\frac{E}{t}[/tex]

Thus a car's engine power is 44000W implies that the engine of the car can propel the car at this rate. This expresses the rate (top speed) at which it can move with time.

2) m = 400g = 0.4 kg

    t = 20 s

h = 100m

g = 10 m/[tex]s^{2}[/tex]

P = [tex]\frac{mgh}{t}[/tex]

  = [tex]\frac{0.4*10*100}{20}[/tex]

  = [tex]\frac{400}{20}[/tex]

P = 20 W

3) u = 600 m/s

   g = 10 m/[tex]s^{2}[/tex]

From the third equation of free fall,

[tex]V^{2}[/tex] = [tex]U^{2}[/tex] - 2gh

V is the final velocity, U is the initial velocity, h is the height.

0 = [tex](600)^{2}[/tex] - 2 x 10 x h

0 = 360000 - 20h

20h = 360000

h = [tex]\frac{360000}{20}[/tex]

  = 18000

h = 18 km

The maximum height of the bullet would be 18 km.

Answer:

the size of a pea

Explanation:

Answer:

  F = 4361.7 N

Explanation:

In this exercise the force of the string is asked, to solve it we use Newton's second law

          F - W = m a

force is the tension of the rope

the centripetal acceleration is

        a = v² / r

the angular and linear speed are related

        v = w r

let's substitute

          F - mg = m w² r

          F = m (g + w² r)

let's reduce the magnitudes to the SI system

       w = 2.0 rot / s (2π rad / 1 rev) = 4π  rad / s

let's calculate

       F = 10 (9.8 + (4π)² 2.7)

       F = 4361.7 N

Answer:

Students should realize that each atom in a group has the same number of electrons in its outermost energy level. For instance, hydrogen, lithium, sodium, and potassium all have 1 electron on their outer energy level. Let students know that these electrons in the outermost energy level are called valence electrons.

Answer:

frequency = 0.5 Hz and speed = 2 m/s

Explanation:

Given that,

The period of a wave, T = 2 s

Wavelength, [tex]\lambda=4\ m[/tex]

If f be the frequency. So,

f = 1/T

[tex]f=\dfrac{1}{2}\\\\f=0.5\ Hz[/tex]

Speed of a wave is given by :

[tex]v=f\lambda\\\\v=0.5\times 4\\\\v=2\ m/s[/tex]

So, the frequency of the wave is 0.5 Hz and speed is 2 m/s.

Answer:

the acceleration of the race car is 2 m/s²

Explanation:

Given;

initial velocity of the race car, u = 44 m/s

final velocity of the race car, v = 66 m/s

time of motion of the race car, t = 11 s

The acceleration of the race car is  calculated as;

[tex]a = \frac{v-u}{t} \\\\a = \frac{66-44}{11} \\\\a = 2 \ m/s^2[/tex]

Therefore, the acceleration of the race car is 2 m/s²