Can someone help me number five idk if im correct

Answers

Answer 1

Answer: Gravity is the force that attracts a object to the center of the earth.

Answer 2

Answer: yes your correct. :)

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what is required to bring about a phase change 1.an increase or decrease in pressure 2.an increase or decrease in energy 3.an increase in energy only 3.a decrease in energy only

Answers

Answer: An increase or decrease in energy!

Explanation: I just took the quiz, I got it wrong with the increase or decrease of pressure. This is the right answer nowww.

A child drags a 0.398 kg toy dogacross flat ground at constant speed,
with a 4.63 N force at a 63.0° angle.
What is the force of friction on the
toy?
(Hint: You do NOT need to know the
coefficient of friction.)

Answers

The force of friction on the toy is 2.10 N and it acts opposite to the direction of its motion.

What is friction?

A force called friction prevents one solid object from rolling or sliding over another. Although frictional forces, such the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion.

Given parameters:

mass of the toy dog: M = 0.398 kg.

Applied force: F = 4.63 N.

Angle of application of force: θ = 63.0°

Hence, horizontal component of applied force = F cosθ

= 4.63 × cos63.0° N

= 2.10 N.

As the child drags a 0.398 kg toy dog across flat ground at constant speed, this component of applied force is nullified by force of friction.

Hence, the force of friction on the toy is 2.10 N and it acts opposite to the direction of its motion.

Learn more about friction here:

brainly.com/question/13000653

#SPJ2

Answer:

-2.1 N

Explanation:

A 7.00-kg bowling ball from a 2.00-m shelf. Just before hitting the floor, what will be it’s kinetic energy?

Answers

I'm not sure of the numbers sense I dont have a calculator right now. The formula is 1/2*M*V^2.

What will happen to the mass and volume of a block if their is two blocks, three, blocks or four blocks? For example, if the mass of a block is 7g and the volume is 15.625, what will that be if more blocks are added? Please help it is much apreciated!

Answers

To solve this problem, it would be helpful to know the density of 1 block Density is defined as the mass of the substance per volume. From the example given, The density of the block is (7g)/(15.625 units^3) or 0.448 g/units^3. So, if a block is added, the new mass is 7g + 7g = 14 g And the volume 14 g /(density) = 1 unit^3

Calculate the angular velocity of a clocks second hand, its minute hand, and its hour hand. State in Rad/s. What is its angular acceleration in each case?

Answers

The angular velocity of a clocks second hand, its minute hand, and its hour hand are 0.1047rad/s, 1.745 × 10⁻³rad/s and 1.454 × 10⁻⁴rad/s respectively.

Time period for second hand; $T = 60s$

Time period for minute hand; $T = 60m = 60 * 60s = 3600s$

Time period for hour hand; $T = 12hours = 12* 60 * 60s = 43200s$

Now, we use the relation between angular speed and time period:

$w = (2\pi )/(T)$

Where ω is the angular velocity and T is the time period in seconds.

For Second hand

$w = (2\pi )/(60s) = 0.1047rad/s$

For Minute hand

$w = (2\pi )/(3600s) = 1.745* 10^(-3)rad/s$

For Hour hand

$w = (2\pi )/(43200s) = 1.454* 10^(-4)rad/s$

Therefore, the angular velocity of a clocks second hand, its minute hand, and its hour hand are 0.1047rad/s, 1.745 × 10⁻³rad/s and 1.454 × 10⁻⁴rad/s respectively.

Learn more: brainly.com/question/8711708

Second hand:

1 rev per minute = (2π radians/minute) x (1 min/60sec) = π/30 rad/sec

Minute hand:

1 rev per hour = (2π radians/hour) x (1 hr/3600 sec) = π/1800 rad/sec

Hour hand:

1 rev per 12 hours = (2π rad/12 hr) x (1 hr/3600 sec) = π/21,600 rad/sec

As long as the clock is in good working order, and the hands are turning steadily at their normal rate, there is no angular acceleration.

My homework says-Explain why weight would be different on different planets by talking about gravity.

Answers

And I gather that instead of trying it on your own, you want me to do it for you.

The force of gravity between two objects always involves the product of
both of their masses.

"Weight" is the force of gravity between a planet and an object on its surface,
so it depends on both masses.

When a rock, a space probe, or an astronaut goes to a different planet, its/his
mass doesn't change, but the mass of the body they're standing on is different.
So the weight of the rock or the astronaut is different from what it is on Earth.

Gravitational forces on different planets and natural satellites are different. Let's take an example of Moon and the Earth. The gravitational force on Moon is $(1)/(6) th$ of that on Earth. And we know that -

$Weight = mass*gravitational$ $acceleration$

So, this formula clearly depicts that Weight of any object depends on mass of that object as well as on the gravitational acceleration. So, the lesser gravitational acceleration on Moon makes an object weigh lighter on Moon than on Earth. Similarly it is true for different planets also.