PHYSICS HIGH SCHOOL

Centripetal acceleration occurs because an object isSelect one:
a. slowing down.
b. changing direction.
c. speeding up.
d. none of these choices.

Answers

Answer 1
Answer:

Answer:

changing direction

............

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The Articles of Confederation established a strong national government.
a. True
b. False

Answers

It is false that the Articles ofConfederation established a strong national government. Because it wasestablished after the war. Federalists agree tothe constitution and believe that a strong central government is needed for thepreservation of the union. They focused and criticized the flaws of Articles ofConfederation and view their rivals as having no solutions. The leaders in thisgovernment are strong and well organized. Anti-Federalists on the other hand,agree to the weak federal government and fully supported the bill of rights;they further argued that the constitution being proposed by the federalistscontain no protection of the rights of the individual. They are skeptical onthe constitution as it is being influenced by the colonialism. 

Answer:

false

Explanation:

To test the quality of a tennis ball, you drop it onto a floor from a height of 4.00m . It rebounds to a height of 2.00 m. If the ball is in contact with the floor for 12.0ms,(a) What is the magnitude of its average acceleration during the contact?
(b) is the acceleration up or down?

Answers

A. dont know
B. Up not down

When the temperature of an object increases, what happens to the kinetic energy of the particles in the object? A.It is conserved.


B.It equals zero.


C.It increases.


D.It decreases.

Answers

When the average kinetic energy of the particles in the object increases, we sense and measure that change as an increase in the object's temperature.

Restate newton's third law of motion

Answers

Newton's third law states that, for every action there is an equal and opposite reaction.

Mathematically, Fa = -Fr

Hope this helps!

Can someone help please ​

Answers

Hi there!

We know that:

Potential energy = mgh, where:

m = mass

g = acceleration due to gravity

h = height

We know that ΔPE = mgΔh = 1.47 kJ, so:

1.47kJ = mgΔh

Remember to convert kJ to J for simplicity: (1 kJ = 1000J)

1470J = mgΔh

Rearrange to solve for Δh:

1470/mg = Δh

1470/(60 · 9.8) = 2.5m

Calculate the average power required to lift a 490 Newton object of vertical distance of 2 m in 10 seconds

Answers

             Power  =  (work done) / (time to do the work)

             Work  =  (force) x (distance)

If you want to lift a 490N object, you'll need (at least) 490N of force.
So, when you lift it 2 meters vertically, the work you do is

             Work  =  (490 N) x (2 m)  =  980 joules
and
             Power = (980 joules) / (10 sec)  =  98 watts .  
                 
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