PHYSICS HIGH SCHOOL

Forces contribute to the net force on a car rolling down a ramp?Forces contribute to the net force on a car rolling down a ramp.

a. Which force supports the car’s weight?
b. Which force accelerates the car down the ramp?
c. Which force acts against the motion of the car? __

Answers

Answer 1

Answer:

Answers

1) Reaction

2) Gravitational force

3) Frictional force

Explanation

Reaction is directly opposite and equal to action(normal force). The normal force is the weight. So we can say that reaction supports the weight of the car.

Objects fall downwards due to acceleration due to gravity. The acceleration force is provided by the gravitational force. The car is accelerated downwards by the gravitational force.

Frictional force is the force that opposes relative motion between two bodies. When iar is involved, we call it viscosity. So the force that acts against the motion of the car is friction.

Answer 2

Answer: a. the normal force is the ground pushing up on the car
b. gravity accelerates the car down toward the earth
c. friction and air resistance act against the motion

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Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal. E) There is no change in the distribution of the charge in the object.
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(Coulomb's Law) can anyone tell me if there is any cases in which the electrostatic force between 2 objects is 0?

Answers

Well, just look at Coulomb's law, set it equal to zero, and then
see what it would take to make the equation true.

Electrostatic force =
(a constant number) x (charge#1) x (charge#2) / (distance between them)² = 0

There you have an equation, with some stuff on the left side that's all equal to zero.

The stuff is all in the form of one fraction. In order for the fraction to be zero,
either the numerator is zero, or else the denominator is infinite.

So ?

The force is zero if ...

-- at least one of the charges is zero, OR

-- the charges are an infinite distance apart.

If you can arrange for either of those conditions, then you'll have zero force.

Eletrostatic force between only two charges never is null. But if there are interactions with 3 or more charges is possible between two of them be null.

Suppose two clowns on skateboards are standing motionless on a smooth surface 2.0 m apart. Clown B tosses a 5.0 kg medicine ball to Clown A. After the throw the medicine ball is traveling with a speed of 10 m/s. What is the resulting velocity of Clown B after throwing the ball? *Indicate which direction is positive.

Answers

Answer:

Explanation:

By momentum conservation

Momentum of ball $m_b$ = 10 . 5 = 50 kg m/s

$m_1v_1=m_bv_b$

$70v_1= 5* 10$

$v_1 = 0,714m/s$ left

$m_2v_2=m_bv_b$

$50*10 = 50 v_b$

$v_2= 1m/s$ Right

Which of the following lists the stars in order from least density to greatest density?A. white dwarf, neutron star, main sequence star, giant
B. giant, main sequence star, white dwarf, neutron star
C. white dwarf, neutron star, giant, main sequence star
D. neutron star, white dwarf, main sequence star, giant

Answers

The following lists ofstars in order from least density to greatest density are giant, main sequencestar, white dwarf, neutron star. The answer is letter B. Aside from neutronstar being the densest star, it is also the smallest star compared to the giantstar, as its name implied.

Answer:

Explanation:

as a medium star

At which point in the life cycle of a star does nuclear fusion begin?A. Black hole
B. Main sequence
C. Nebula
D. Protostar

Answers

I would say B : main sequence is the answer . this is the answer i believe because the star will increase in size and than shine brightly and when it's done , it will get smaller turning into nebula , eventually exploding sometime around the last stage , but not the last stage of b , c, or d

i really hope that this helps you a lot.

Final answer:

The correct answer is D. Protostar.

Nuclear fusion in a star's lifecycle begins during the protostar stage. This is when the temperature and pressure of the protostar ignite nuclear fusion, transitioning into a main sequence star.

Explanation:

In the life cycle of a star, nuclear fusion begins when the star has reached the protostar stage. The initial stage in the development of a star is the nebula, which is a cloud of dust and gas. Over time, the nebula's materials collapse under gravity to form a hot core known as a protostar.

When the protostar's temperature and pressure rises, it triggers nuclear fusion and the star begins turning hydrogen into helium.

This marks the transition from a protostar to a main sequence star, which is the stage of stable nuclear fusion.

Learn more about Nuclear Fusion in Stars here:

brainly.com/question/34526270

#SPJ3

Which type of force pulls objects toward one another

Answers

Gravity ALWAYS does that, and electrostatic force does it when two objects have opposite charges.

Gravitational force, magnetic force and electric force

which element, represented by x, reacts with fluorine to produce the compound xf2?(1) aluminum (3) magnesium(2) argon (4) sodium

Answers

Accrording to me Mg should be that element because Magnesium forms divalent cations and is capable of accepting 2 anions such as Fluorine

Magnesium reacts to Fluorine to create Magnesium Flouride or MgF2

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