1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kazeer [188]
3 years ago
7

what is the kinetic energy of an object that has mass of 30 kilograms and move with a velocity of 20 m/s

Physics
1 answer:
kotegsom [21]3 years ago
7 0
Kinetic Energy = 1/2 * m * v² 1/2 * 30 * 20² 1/2 * 30 * 400 12000/2 6000 J.
You might be interested in
The Sears Tower is nearly 400 m high. How long would it take a steel ball to reach the ground if dropped on the top? What will b
kipiarov [429]

Answers:

a) 9.035 s

b) -88.543 m/s

Explanation:

The described situation is related to vertical motion (especifically free fall) and the equations that will be useful are:

y=y_{o}+V_{o}t+\frac{1}{2}gt^{2} (1)  

V=V_{o}+gt (2)  

Where:  

y=0 is the final height of the steel ball

y_{o}=400 m is the initial height of the steel ball

V_{o}=0 is the initial velocity of the steel ball (it was dropped)

V is the final velocity of the steel ball

t is the time it takes to the steel ball to reach the ground

g=-9.8 m/s^{2} is the acceleration due to gravity

<u>Knowing this, let's begin with the answers:</u>

<h2>a) Time it takes the steel ball to reach the ground</h2>

We will use equation (1) with the conditions listed above:

0=y_{o}+\frac{1}{2}gt^{2} (3)  

Isolating t:

t=\sqrt{\frac{-2y_{o}}{g}} (4)  

t=\sqrt{\frac{-2(400 m)}{-9.8 m/s^{2}}} (5)  

t=9.035 s (6)  

<h2>b) Final velocity of the steel ball</h2>

We will use equation (2) with the conditions explained above and the calculaated time:

V=gt (7)  

V=(-9.8 m/s^{2})(9.035 s) (8)  

V=-88.543 m/s (9)  The negative sign indicates the direction of the velocity is downwards

3 0
3 years ago
El tren Lima la Orolla va a una velocidad de 10 km/h y de pronto aplica el freno por un derrumbe en la via. Si demora 18 segundo
Naya [18.7K]

Answer:

Distancia = 50.04 metros

Explanation:

Dados los siguientes datos;

Velocidad = 10 km/h

Tiempo = 18 segundos

Para encontrar la distancia;

Conversión:

10 km/h = 10 * 1000/3600 = 2.78 m/s

Distancia = velocidad * tiempo

Distancia = 2.78 * 18

Distancia = 50.04 metros

Por lo tanto, el tren viajaría 50.04 metros antes de detenerse por completo.

7 0
3 years ago
The stones are launched from the top of a tall building. One stone is thrown in a direction 15.0 ∘ above the horizontal with a s
const2013 [10]

Answer:

Maximum horizontal distance covered by both the stones will be same because the speed at which both the stones are thrown is same.

However, stone that is thrown upward will spend more time in the air as compared to the stone that is thrown downward because of the projectile and vertical component of the velocity.

5 0
4 years ago
Intermolecular forces hold
blagie [28]
I believe Intermolecular forces hold, <span>molecules, ions, and atoms? But I would see if that doesn't sound familiar check it with a site or something?</span>
3 0
3 years ago
PLEASE HELP!!!!!
Arte-miy333 [17]

Answer:

it states that energy can either be gained or lost but it only changes its form.

Explanation:

for example:as a ball is still on the table it posses a potential energy of 100j and a k.e of 0j,as it falls it gains k.e so the midpoint the p.e is equal to the k.e (50j equally) as it approches the ground it completely gains k.e (100j) and the p.e is 0j.

total energy is 100j so it has been converted from p.e to k.e.

hope u have understood.

5 0
3 years ago
Other questions:
  • List out the methods that you can use to separate solid-solid mixtures
    13·1 answer
  • A space shuttle travels in orbit at 21,000 km/hr. how far will it travel in 5 hr
    11·1 answer
  • Which is a component of pseudoscience, but not science?
    10·1 answer
  • a block is 2cm wide, 5.4cm deep, and 3.1cm long. the density of the block is 8.5g/cm. what is the mass of the blocks?
    8·1 answer
  • A computer is purchased for $2816 and depreciates at a constant rate to $0 in 8 years. Find a formula for the value, V , of the
    13·1 answer
  • Mercury’s natural state is where the atoms are close to each other but are still free to pass by each other in witch states coul
    7·2 answers
  • Which of the following statements accurately describes work being done.
    11·2 answers
  • Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then
    6·1 answer
  • Please hurry
    7·1 answer
  • What is the acceleration of the car at segment C?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!