Ted wants to hang a wall clock on the wall by using a string. If the mass of the wall clock is 0.250 kilograms, what should be the tension of the string so that it can sustain the weight of the wall clock?

Answers

Answer 1

Answer: The clock is pulling the force towards earth's center because of gravity.
That force is equal to:
F = m*g where g is gravitational acceleration.

We will take that g = 9.81m/s^2

Now:
F = 0.25 * 9.81 = 2.4525 N

The string needs to sustain that force, therefore minimum Force that string has to be able to sustain is:
2.4525 N

Answer 2

Answer:

The answer is 2.45 newtons because 1 kg = 9.8 newtons so when we use that ratio, we get around 2.45 newtons for 0.25 kg. This would be your (B) option I think.

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Nearly all physics problems will use the unit m/s^2 for acceleration. Explain why the seconds are squared. Why isn't the unit given as m/s, as it is for speed

Answers

Because acceleration is not speed, and speed is not acceleration.
I'm sure you would not ask "Why isn't temperature given in acres,
as it is for area ?" Speed and acceleration are different things, so
it's only natural that they have different units.

The magnitude (size) part of acceleration is:

   (how much speed changes) per second.

Are you speeding up ?
Are you traveling (2 meters per second) faster every second ?
Then your acceleration is

   (2 meters per second) per second .

When you write that phrase as an algebraic expression, it's

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and when you simplify that fraction, you get    2 m/sec² .

Potential energy is the energy

Answers

....possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors

Answer:

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Explanation:

Potential energy is the energy stored in a body due to the body’s positioning or state.

Which type of star has the widest range in brightness and surface temperature?a. giant
b. white dwarf
c. neutron
d. main sequence

Answers

Answer:

the best answer is Giant.

Explanation:

I believe It's...

d. main sequence

Signs marking __________ may indicate requirements associated with them and the hours when those requirements apply.

Answers

HOV lanes.

What is HOV lanes?

High-Occupancy Vehicle (HOV) lane is a lane that is designated for use by certain types of vehicles with a specified number of occupants.

It can offer travel-time savings to those who choose to carpool or take transit.

HOV lanes can move a greater number of people than a general traffic lane, and encourage carpooling and transit use by providing travel-time savings and a more reliable trip time.

HOV lanes are open 24 hours a day, seven days a week.

Here,

Signs marking HOV lanes may indicate requirements associated with them and the hours when those requirements apply.

Learn more about HOV lanes here:

brainly.com/question/14333805

#SPJ2

B. HOV lanes (not gore areas or toll booths, if those are the two other choices)

How much work is done by a crane that lowers 1000N of material a distance of 150

Answers

The crane does NO work.

Work = (force) x (distance)

= (1,000 N) x (150 meters ?) = 150,000 joules

But the work is in the direction of the force, and it isn't the crane
pushing the material down. It's gravity.

Gravity is doing the work.

If the material was being lowered by a cable wrapped around the shaft
of an electric generator, then you could use the work done by gravity to
generate some electrical energy, and then sell the energy.

Or, if the "material" happened to be water, you could let gravity lower it
through a turbine or a water wheel, and use the work done by gravity to
grind wheat.

Yes, the crane may be raising a sweat, working against gravity. The
purpose is only to prevent gravityfrom doing the work too fast.

Since workdone isForce times distanceGiven force-1000nDistance-150Wd-1000 times 150Wd-150000n.

The phase change in which a substance changes from a gas directly to a solid isA. condensation.
B. vaporization.
C. deposition.
D. sublimation.

Answers

Condensation is the change ofthe substance from liquid to solid phase. Example of this is the formation ofice. Vaporization is the change of substance from liquid to gas phase. Example ofthis is the boiling of water. Deposition is the change of a substance from gasto solid phase. Example of this is the formation of ice on a winter day. Sublimationis the change of a substance from solid to gas phase. Example of this is dryice. The answer is letter C.

Answer: Properties and States of Matter Practice

1. Which of the following are pure substances? Compounds

2. A substance that cannot be broken into similar substances is called a(n)... Element

3. When a physical change in a sample occurs, which of the following does NOT change? Composition

4. Which of the following will cause a decrease in gas pressure in a closed container? Lowering the temperature

5. The heat of fusion for water is the amount of energy needed for water to... Melt

6. The phase change in which a substance changes from a gas directly to a solid is... Deposition

7. Which of the following phase changes is an exothermic change? sublimation

8. Which of the following has the highest viscosity? Corn Syrup

9. In which of the substances in the figure below are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions? It is the one where the particles are more apart.

Explanation:

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