A SI unit used to measure force, equal to less than one-quarter of a pound, is the what

Answers

Answer 1

Answer:
The SI unit of force is the Newton.

1 newton is the force that accelerates a 1 kilogram mass
at the rate of 1 meter per second².

1 pound of force is equivalent to roughly 4.448 newtons.

(1 newton is equivalent to roughly 0.225 pounds of force.)

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Because the moon rotates once for each revolution around Earth,a. you see some phases more than others. b. a different side of the moon faces Earth each day.c. you never see the far side of the moon from Earth.d. the far side of the moon is visible only during the full moon phase.
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Can someone help me on 2 science question,this is what they say
1. A teacher challenges.students to study moon phases to determine if what they have learned from the textbook is accurate. How might a student investigate claims made in a textbook that moo. phases occur in a 28-day cycle?
A. observe the phase of the moon each night until a full moon can be seen.
B. Compare the textbook phases to the actual moon phases seen in the night sky each night in 28 days periods over a three month time frame.
C. Compare diagrams of moon phases from the textbook to diagrams of moon phases on-line
D. Observe the moon phases seen in the night sky as often as possible over a six month period.

2. What causes the apperance of the moon change overtime?
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D. The distance of the moon to the sun

thank you

Answers

1. I think you should compare diagrams of moon phases from the textbook to diagrams of moon phases online. Because if you pick D it will take to long and C will help you out whith 3 different things to look at.

2. The moon changes in appearances from the perspective of people on earth because it's revolving around the planet and the earth is revolving around the sun, so A. Hoped this helped.

The specific heat capacity of a substance is the amount of energy associated with doing which of the following to 1kg of the substance?

Answers

Answer:

Raising its temperature by $1^(\circ)C$

Explanation:

The specific heat capacity of a substance is defined as the amount of energy needed to raise the temperature of 1 kg of a substance by $1^(\circ)C$ .

The specific heat capacity of a substance essentially tells us how much energy is needed to heat the substance: the larger it is, the more energy is needed. The amount of energy needed to increase the temperature of a substance is given by

$Q=mC_s \DeltaT$

where

m is the mass of the substance

Cs is the specific heat capacity

$\Delta T$ is the temperature variation of the substance

Answer:

Raising its temperature by 1 C

Explanation:

A P E X

What is friction and explain

Answers

Friction is the force you get when you (for example) Rub something with another, it's a force that may generate heat and even some resistance. Another example is rubbing your hands together, they get hot, therefore friction is working, without friction you wouldn't be able to stop moving.

Friction is the resistance of mass when on another object.
If we avoid friction, we move faster.
But, in some cases, friction is also good. It is used in car brakes, when something rubs on the wheels to make the wheels stop rolling, or rotating.
Ice skates may be another thing. They provide a little friction on the blades, to be able to stop and to be able to move.

What net is required to push a sofa with a mass of 59 kilograms so that it accelerates at 9.75 meters/second^2 (assume a flat,frictionless surface.)

Answers

Newton's 2nd Law of Motion: Force = (mass) · (acceleration)

Do I need to go any further ?

I get 575.25 Newtons .

Oh ! Look at that ! Right there at the top, it says "Using Newton's Second Law". This might have suggested to you that maybe you could solve the problem by using Newton's Second Law.

A sample of compressed methane has a volume of 648 mL at a pressure of 503 kPa. To what pressure would themethane have to be compressed in order to have a volume of 216 mL?

Answers

In order to have a volume of 216 ml, the methane have to be compressed at a pressure of 1509 kPa.

Explanation:

This problem is solved by using Boyle's law which states that at constant temperature pressure of a gas is inversely proportional to its volume. It describes how the pressure of a gas increases with a decrease in the volume of a container. The formula is given as,

P1 V1 = P2 V2

where P1 and V1 are first pressure and volume,

P2 and V2 are second pressure and volume.

Given P1 = 503 kPa, V1 = 648 ml, and V2 = 216 ml

P2 = (P1 $*$ V1 ) / V2 = (503 $*$ 648) / 216

P2 = 1509 kPa.

How do whales bats and dolphins use echolocation?A To scare away predators
B To attract mates
C To orient them selves and find food
D To tell animals of there species where they are

Answers

C is your answer ithink

I think ur answer is c

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