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Norma-Jean [14]

3 years ago

15

Someone pushes on a rock and measures the net force acting on it is 147 N and acceleration to be 7.5m/s2.What is the weight of t

he rock?

1 answer:

kogti [31]3 years ago

7 0

Some1 pushes u and then u defend your self

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Name three characteristics of scientists that are important to their work but are also found in nonscientists.

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The three characteristics of a good scientist are his curiosity, creativity and problem-solving skills.

Explanation:

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2 years ago

An undiscovered planet, many light-years from Earth, has one moon, which has a nearly circular periodic orbit. If the distance f

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3 years ago

An atom with 9 protons, 11 electrons, and 10 neutrons has a net charge of

LiRa [457]

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3 years ago

A phone cord is 4.67 m long. The cord has a mass of 0.192 kg. A transverse wave pulse is produced by plucking one end of the tau

Olegator [25]

Answer:

91.017N

Explanation:

Parameters

L=4.67m, m=0.192kg, t = 0.794s, The pulse makes four trips down and back along the cord, we have 4 +4 =8 trips( to and fro)

so N= no of trips = 8, From Wave speed(V) = N *L/t , we have :

V= 8*4.67/0.794 = 47.0529 m/s.

We compute the cords mass per length, Let it be P

P = M/L = 0.192/4.67 = 0.04111 kg/m

From T = P * V^2 where T = Tension, we have

T = 0.04111 * (47.0529)^2

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The tension in the cord is 91.017N

3 0

3 years ago

NEED HELP ASAP!! Will give Brainliest.

olga2289 [7]

a. 25 joules of work is done by the object.

Explanation:

According to the work-energy theorem, the work done ON an object is equal to the change in kinetic energy of the object, therefore:

$W=K_f -K_i= \frac{1}{2}mv^2-\frac{1}{2}mu^2$

where

$K_f = \frac{1}{2}mv^2$ is the final kinetic energy of the car, with

m = 2 kg being the mass of the car

v = 0 is the final speed of the car (brought to rest)

$K_i = \frac{1}{2}mu^2$ is the initial kinetic energy of the car, with

u = 5 m/s being the initial speed of the car

Substituting numbers, we find:

$W=\frac{1}{2}(2)(0)^2 - \frac{1}{2}(2)(5)^2=-25 J$

The negative sign means that the work done ON the car is negative: this means therefore that the work has been actually done BY the car. In fact, the car has lost its kinetic energy: this means that it has done work on the surrounding, converting its kinetic energy into other forms of energy.

Learn more about work and kinetic energy:

brainly.com/question/6763771

brainly.com/question/6443626

brainly.com/question/6536722

#LearnwithBrainly

5 0

3 years ago