All categories

3 years ago

DONT ANSWER WITH A LINK PLEASE I NEED AN ANSWER FROM SOMEONE!

Physics

2 answers:

lora16 [44]3 years ago

7 0

Answer:Forms of energy:

Kinetic energy

is the energy of motion.

Kinetic Energy (KE) depends on mass (m) and speed (v).

Kinetic Energy = mass x velocity2

KE = mv2

explanation; is just an explanation

What is the kinetic energy of a car that has a mass of 1200 kg and is moving at a speed of 20 m/s ?

KE = mv2

KE = 1200 kg * (20 m/s)2

KE = 1200 kg * 400 m2/s2

KE = 480,000 kg*m2/s2

KE = 240,000 kg m2/s2

240,000 J

How does the kinetic energy compare to the example problem above?

#3 What is the kinetic energy

of a car that has a mass of 1200 kg and is moving at a speed of 40 m/s ?

KE = mv2

KE = 1200 kg * (40 m/s)2

KE = 1200 kg * 1600 m2/s2

KE = 1,920,000 kg*m2/s2

KE = 960,000 kg m2/s2

960,000 J

rjkz [21]3 years ago

3 0

At 4 m/s?

How do the two kinetic energies compare to one another? QUADRUPLES !

#3 What is the kinetic energy of a 2,000 kg bus that is moving at 30 m/s?

Potential energy

You might be interested in

At a particular instant, a moving body has a kinetic energy of 295 J and a momentum of magnitude 25.1 kg · m/s.(a)What is the sp

motikmotik

Answer:

a) 23.51 m/s

b) 1.07 kg

Explanation:

Parameters given:

Kinetic energy, K = 295 J

Momentum, p = 25.1 kgm/s

a) The kinetic energy of a body is given as:

$K = \frac{1}{2} mv^2$

where m = mass of the body and v = speed of the body

We know that momentum is given as:

p = mv

Therefore:

K = 1/2 * pv

=> v = 2K / p

v = (2 * 295) / 25.1 = 23.51 m/s

The velocity of the body at that instant is 23.51 m/s.

b) Momentum is given as:

p = mv

=> m = p / v

m = 25.1 / 23.51 = 1.07 kg

The mass of the body at that instant is 1.07 kg

5 0

3 years ago

On a cross-country trip, a couple drives 500 mi in 10 h on the first day, 380 mi in 8.0 h on the second day, and 600 mi in 15 h

Zepler [3.9K]

We know that the average speed is simply the ratio of the total distance travelled over the total duration of the trip.

total distance = 500 mi + 380 mi + 600 mi

total distance = 1,480 mi

total time = 10 h + 8 h + 15 h

total time = 33 h

So the average speed is therefore:

average speed = 1,480 mi / 33 h

average speed = 44.85 mi / h

8 0

3 years ago

Can a physical change, change what a substance is

Elden [556K]

No the substance will remain the same substance as before.

7 0

2 years ago

What two kinds of crust are involved in a subduction zone

Anarel [89]

Answer:

Oceanic crust and continental crust

Explanation:

A subduction zone is normally between oceanic crust which is made of basalt and continental crust which is made of granite. Oceanic crust is denser than continental crust. So when oceanic crust collides with continental crusts, it subsducts underneath the continental crust since it is denser.

5 0

3 years ago

1. When you have different masses for each sphere, how does the force that the larger mass sphere exerts on the smaller mass sph

aleksandrvk [35]

1) The forces are equal (Newton's third law of motion)

2) The force between the spheres will quadruple

3) The force of gravity exerted by the notebook on you is negligible

Explanation:

In this part of the problem, we want to compare the gravitational force exerted by the larger mass sphere on the smaller mass sphere to the force exerted by the smaller mass sphere to the larger mass sphere.

We can do this by using Newton's third law of motion, which states that:

"When an object A exerts a force (called action) on an object B, then object B exerts an equal and opposite force (called reaction) on object A"

In this problem, we can identify the larger mass sphere as object A and the smaller mass sphere as object B. This law tells us that the two forces are equal in magnitude and opposite in direction: therefore, the gravitational force exerted by the larger mass sphere on the smaller mass sphere is equal to the force exerted by the smaller mass sphere to the larger mass sphere.

The magnitude of the gravitational force between the two spheres is given by

$F=G\frac{m_1 m_2}{r^2}$