An elevator is used to either raise or lower sacks of potatoes. In the diagram, a sack of potatoes of mass 10 kg is resting on a scale that is resting on the floor of an accelerating elevator. The scale reads 12 kg. What is the acceleration of the elevator?

Answers

Answer 1

Answer: Technically, if your question refers us to a diagram, then you owe us a peek at the
diagram. But there may be enough info in the description to solve this one blind.

Newton's second law of motion: F = M A
"The force on an object is the product of the object's mass and its acceleration."

Divide each side by 'A': A = F / M
"The rate at which an object accelerates is its mass divided by the force on it."
Hold that thought for a moment, while we go off on a tangent:
================================
Everybody talks about "kg" as if it were a force, and this question shows why
that's a terrible thing to do. In this question, "kg" is used BOTH as a mass AND
as a force. I can't think of a better way to confuse students who are just now
working with this stuff for the first time. The question is badly written, although,
in the real world, scales do read in 'kg'.
"Kg" is a mass. It is not a force.

I think that rather than try to teach more physics to get out of this hole,
the best way to go at it is like this:

If the scale were sitting still, on the ground, or rising at a steady rate and
not accelerating, then the only force on the 10 kg mass would be the force
of gravity, and the scale would read '10 kg'. But in the upward-accelerating
elevator, the scale reads 20% more, telling us that 20% more than the force
of gravity is acting on the mass. That extra 20% of upward force is provided
by the upward acceleration, which must be 20% of the acceleration of gravity.
The acceleration of gravity is 9.8 meters per second² .
The elevator is accelerating (0.2 x 9.8) = 1.96 meters per second².

.

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A 2,100 kg car is lifted by a pulley. If the cable breaks at 4.50 m, what is the velocity of the car when it hits the ground

Answers

The problem involves the conversion of potential energy to kinetic energy as the object falls from rest. Energy is conserved, so the equation used is:

PEi + KEi = PEf + KEf

Since the object is falling from rest, the initial kinetic energy is zero. Also, since the object hits the ground at its final position, the final potential energy is zero. This leaves:

PEi = KEf
mgh = 1/2 mv^2

*cancel out mass on both sides of the equation

gh = 0.5v^2
v = sqrt(2gh) = sqrt(2*9.81*4.5) = 9.40 m/s --> final ans.

Electromagnetic waves can travel through empty space true or false

Answers

False. Heat radiation from the sun cannot reach Earth, we cannot receive TV or GPS signals from satellites, and we cannot detect the light from distant stars.
Oh, wait . . .

2 QUESTIONS HELP PLZ...:/Which of the following is not part of the structure of a comet?

A. Coma
B. Head
C. Dust tail
D. Nucleus

How far can light travel in one year?

A. 300,000 km
B. 30 million km
C. 10 trillion km
D. 100 billion km

THANKS IF ANYONE CAN HELP =)

Answers

The first one is: head
Second one is: 10 trillion km

When two or more forces act together on an object what do they combine to form

Answers

Without knowing anything about their magnitudes or directions, the only thing you can always say about thier combination is that it's the "net force" on the object.

List 3 examples behaviors of solid and the 3nwrgy associated with them

Answers

Answer:

retains a fixed volume and shape

rigid - particles locked into place

not easily compressible

little free space between particles

does not flow easily

rigid - particles cannot move/slide past one another

Explanation:

Sure! Here are three examples of behaviors of solids and their associated energies:

1. Behavior: Solids have a definite shape and volume.
Energy: Solids possess potential energy due to the arrangement of their particles.

2. Behavior: Solids are rigid and maintain their shape when subjected to external forces.
Energy: Solids exhibit elastic potential energy when deformed and can store mechanical energy.

3. Behavior: Solids have a fixed melting point at which they transition to a liquid state.
Energy: Solids require thermal energy (heat) to overcome intermolecular forces and transition to a liquid state.

The expiration date on a product refers to the last date a product should be __________.

Answers

It refers to the date where a product should no longer be eaten and isn't fresh enough

The expiration date on a product refers to the last date a product should be used

or should be costumed by

I hope that's help !

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