PHYSICS MIDDLE SCHOOL

The SI units for measuring the velocity of the car: The SI units for measuring the acceleration of the car: The SI units for measuring force: The SI units for measuring mass:

Answers

Answer 1

Answer:

Answer:

The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.

Explanation:

SI unit is the international system units.

We need to define the SI unit of velocity, acceleration, force and mass of the car

The SI unit of velocity is

$v = m/s$

The SI unit of acceleration is

$a = m/s^2$

The SI unit of force is

$F = N=kg-m/s^2$

The SI unit of mass is

$m =kg$

Hence, The SI unit of velocity, acceleration, force and mass of the car are m/s, m/s², kg-m/s² and kg.

Answer 2

Answer:

Velocity ... m/s (meters per second) and angle

Acceleration ... m/s^2 and angle

Force ... Newton (kg-m/s^2) and angle

Mass ... kilogram

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I'm giving out a lot of points for whoever helps me and answers correctly! 3 questions to answer! Please answer them ALL!!! :D1 - Which of these is a good example of Newton's First Law of inertia?

A) A ball sits motionless on the ground
B) A ball gathers speed as it rolls downhill
C) A ball accelerates as it falls out of a classroom window
D) A ball returns to your hand after you throw it up in the air

2 - The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?

A) The moon pulls more on the shuttle
B) The earth pulls more on the shuttle
C) Both are equal due to equal distances
D) Both are equal due to the mass of the shuttle

3 - In which situation is the acceleration of the car negative?

A) The velocity of the car was 75/h over 4 hours
B) The velocity of the car reduced from 50 km/h to 35 km/h over one minute
C) The velocity of a car increased from 40 km/h to 75 km/h over 15 minutes
D) The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h

Answers

1. A) A ball sits motionless on the ground

Newton's First Law of inertia states that:

"When the forces acting on an object are balanced, the object stays at rest (if it was at rest) or continues its motion with constant velocity (if it was in motion)"

Among the options given, we see that the option

A) A ball sits motionless on the ground

is an example of this law: in fact, the ball sits at rest on the ground, the forces acting on it are balanced, so the ball stays at rest.

2. B) The earth pulls more on the shuttle

The gravitational attraction exerted by a planet on the shuttle is given by

$F=G(Mm)/(r^2)$

where

G is the gravitational constant

M is the mass of the planet

m is the mass of the shuttle

r is the distance between the shuttle and the planet

In this problem, we are comparing the gravitational pulls exerted by the Earth and the Moon on the shuttle. The distance, r, is the same (because the shuttle is half-way), the mass of the shuttle m is the same, and G is the same. However, the mass of the Earth is greater than the mass of the Moon, so in the formula M is greater for the Earth: therefore, the Earth pulls more on the shuttle.

3. B) The velocity of the car reduced from 50 km/h to 35 km/h over one minute

The acceleration of the car is defined as the ratio between the change in velocity and the time taken:

$a=(v_f-v_i)/(\Delta t)$

where vf is the final velocity, vi is the initial velocity, and $\Delta t$ is the time taken.

In order to have a negative acceleration, the numerator must be negative: this means that the initial velocity, vi, must be greater than the final velocity, vf, and this situation occurs in option B), since the initial velocity is 50 km/h while the final velocity is 35 km/h.

1-a 2-b 3-b

srry had to write more, i go to this school

4 newtons, 4 amps, 4 joules, 4 watts, 4 ohms, 4 volts
what does I=

Answers

Answer:

I $= 4$ amperes

Explanation:

Newton is the unit of force. Hence 4 newton is not the current “I”

Joules is the unit of energy and hence it do not signify current I

Watt is the unit of power i.e the rate of transfer of energy.

Ohm is the unit of resistance produces thereby obstructing the flow of current

And Volts is the unit of voltage or potential difference between two ends of an electric circuit. Thus, it is also does not signifies current.

Thus, I $= 4$ amperes

Imagine you have a terrible cold. You have 2 Alka-Seltzer tablets and a glass of water. What could you do to increase the rate of the chemical reaction and get the medicine into your body as soon as possible?

Answers

possibly use warm water and stir

If the power rating on a motor is 10W and 500J of energy is used to move a 20N object, how long is the motor used for?

Answers

The power rating on the motor is the maximum power it's ABLE to deliver. It can run with LESS power output than the rating, but if you try to run it with MORE than it's rated, the motor will overheat and eventually burn out.

" 10 watts " means " 10 Joules of enrgy per second ".

If the motor is operated at its full maximum rated capacity, then

(500 joules) / (10 joules/sec) = 50 seconds

Which statement is false?O Preparations for future situations are helpful to avoid pressured situations.
Once you reach adulthood, you will not experience peer pressure.
Peer pressure is often thought of in negative terms even though it can be positive.

Answers

Answer:

Once you reach adulthood, you will not experience peer pressure.

Explanation:

We tend to believe that self-control comes from within, but many of our attitudes depend as much on friends and family as on ourselves. That's because at any stage of our life (even the adult stage) our friends and our family have the power to influence us, sometimes that influence is good and sometimes bad, it's up to us to reason about them.

The people around us have the power to make us fat, consume more alcohol, worry less about the environment and expose ourselves to the sun without proper protection, among many other things.

It is not simply about peer pressure, where you deliberately act in a certain way to suit the group. It is, in fact, largely an unconscious attitude. Without your awareness, your brain is constantly picking up cues from people around you to dictate your behavior. And the consequences can be serious.

Answer:

its B :)

Explanation:

What substance does rock behave like when it is exposed to extreme temperature and pressure?

Answers

the rock morphs into a different rock depending on what type of rock you are talking about

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