PHYSICS MIDDLE SCHOOL

During the course of trajectory the horizontal component of the velocity is; A) constant
B) increasing
C) decreasing
D) negative

Answers

Answer 1
Answer:

The horizontal component of the velocity remains constant in a trajectory course.

Answer: A

Explanation:

The trajectory path is formed due to the gravitational pull acting on the object thrown from some point either upward or downward.

As it is known that the velocity is divided into horizontal and vertical component, the vertical component of the velocity of the object thrown will be mainly influenced by the gravitational pull as it acting in vertical direction only.

So the vertical component of the object following a trajectory path will be changing at a rate of 9.8 m/s2 which is the acceleration due to gravity.

On the other hand, the horizontal component of the velocity will remain constant in order to maintain the law of conservation of energy.
Answer 2
Answer:

im not 100 percent sure but i think its a

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Answers

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Why is it better to search new a cliff for a fossil then near a volcano?

Answers

Its better to search for a fossil near a cliff than a volcano because, when finding a fossil near a volcano, the volcano can erupt.

Contrast the movement of charges in a series circuit and in a parallel circuit.

Answers


In a series circuit, there is only one possible path from one battery
terminal, through the circuit, to the other battery terminal.  All of the
current that leaves one side of the battery travels exactly the same
path to the other side of the battery.  There's never any point in the
circuit where the current has a choice of which way to go.

In a parallel circuit, there are different possible paths.  On its way
through the circuit, the current comes to a point where it has a
choice of going this way or that way.  What happens at that point
is that the current splits up ... part of it goes this way, and the rest
of it goes that way, and it all joins up together again somewhere
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Some people think that because they exercise everyday, they can eat whatever they want. Is this true or false? Also, does the food you enter into your body affects the way you perform when you exercise? Yes or No, and why? Please justify your answers and respond to two other classmates.

Answers

Answer: False

Explanation: This is false because, just because you exercise doesn't mean that it's going to reduce the amount of fat or sugar you just put into your body. Eating healthy and exercising is the way to go. Yes, what you eat does affect the way you perform your work out, you can have a side ache or you may throw up. You aren't even supposed to eat before working out.

Answer:

Just because you exercise everyday doesn't mean you can eat whatever you want. So that statement is false.

The food you eat can affect the way you perform when you exercise.

Explanation:

If you exercise then go home and eat a whole bag of chips what's the point of exercising. You need to have a balanced diet because whats the point of trying to lose weight just so you can gain it back or some more.

If you eat unhealthy foods that have grease,a lot of sodium, ect. It can affect the way you perform your exercises. If you..for example.. eat a lot of food with sodium (like salt) it can mess with your ovary which can cause health problem.

A squirrel (mass 0.9 kg) is running across the road at a speed 4.0 m/s. What is thesquirrel's kinetic energy?

Answers

The kinetic energy of the squirrel with a mass of 0.9 Kg running with a speed of 4 m/s is  7.5 J.

What is kinetic energy?

Kinetic energy of an object is a form of energy generated by virtue of the motion of the object. Kinetic energy is dependent on the mass and velocity of the body.

When a body starts to move its potential energy starts to convert to kinetic energy and the kinetic energy will be maximum at the highest speed. When the object slow down and pause in a position it gains potential energy again.

The kinetic energy KE = 1/2 mv²

Given mass = 0.9 Kg

velocity = 4 m/s.

KE = 1/2 0.9 Kg × 4² m/s

     = 7.5 J

Therefore, the kinetic energy of the squirrel is 7.5 J.

To find more on kinetic energy, refer here:

brainly.com/question/26472013

#SPJ2

Answer:

A). Option A

B). Option B

C). Option B

Explanation:

A weightlifter lifts a 1400 N barbell 2.5 meters. Calculate the work done during the lift

Answers

Answer: W = 3500 J

Explanation: Work is the product of the amount of force and the perpendicular distance or W = Fd.

W = Fd

   = 1400 N ( 2.5 m )

   = 3500 J

Answer:

Force = 1400N

Displacement = 2.5 m

work done = F×D

=1400×2.5

= 3500 joule
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