PHYSICS HIGH SCHOOL

A skateboarder skates down a ramp for 3 seconds. If his initial velocity was 0.8 m/s and · his final velocity was 7 m/s, what was his acceleration?

Answers

Answer 1

Answer:

Answer:

The acceleration of the skateboarder is 2.067 m/s²

Explanation:

Given;

initial velocity of the skateboarder, u = 0.8 m/s

final velocity of the skateboarder, v = 7 m/s

time of motion, t = 3 s

The acceleration of the skateboarder is given as;

$a = (v-u)/(t)\n\na = (7-0.8)/(3)\n\na = 2.067 \ m/s^2$

Therefore, the acceleration of the skateboarder is 2.067 m/s²

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Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the _______________ that drives the nail into the wood.

Which force is always pulling but never pushes and is directly influenced by mass

Answers

Answer: I know when it comes to magnetic objects the magnet always pulls not push.

Answer:

i believe it is gravity

Explanation:

the gravitational force is a force that attracts any two objects with mass. it pulls things together does not pushes them.

Name human body organs where magnetism is significant

Answers

It has been hypothesized, and some studies have supported the conjecture,
that certain species of insects and birds are able to sense the direction of external
magnetic fields.

I don't think there is any such notion where human beings are concerned.

Which statement best compares the accelerations of two objects in free fall? A) The heavier object has a greater acceleration.
B) The object that has the greater surface area has the lower acceleration
C) The object that has the smaller mass has the greater acceleration
D) The objects have the same acceleration

Answers

Answer: option D). The objects have the same acceleration.

The acceleration of both objects is g (acceleration of gravity).

In freefall the only force acting is the attraction of the earth (gravity). There is not air resistance.The acceleration is not dependent either of the mass or the surface area of the object.

The answer is: D) The objects have the same acceleration.

A ball is dropped from a height of 16 feet. Each time it drops h feet, it rebounds 0.81h feet. Find the total distance traveled by the ball.

Answers

The first drop makes the ball travel 16 m.
Then the maximum height decreases to 16 x 0.81
And the distance traveled is twice the distance traveled.
If we make a pattern, this forms a geometric progression in which the common ratio is 0.81 and the first term is 16.
The sum of this series: a / (1 - r)
= 16 ( 1 - 0.81)
= 84 feet
This is the upward height, and the ball returns every time so:
Total distance = 84 x 2
= 168 feet

Question 1.1. Using correct biomechanics helps maximize sport performance. True
False

Question 2.2. The "Fosbury Flop" is named because his idea didn't work.
True
False

Question 3.3. Using correct biomechanics will actually decrease your chances of injury.
True
False

Answers

Question 1.1.True Question 2.2.False
Question 3.3.True
Hope this helps you!!! =')

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):Endothermic
B2+C2-->2BC
A+BC-->AB+C

Exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answers

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):
Endothermic
B2+C2-->2BC
A2+C2-->2AC
A2+B2-->2AB

Exothermic
AB+C-->AC+B
A+BC-->AB+C

Answer:

The correct answer is

Endothermic:

AB+C-->AC+B

A2+C2-->2AC

B2+C2-->2BC

Exothermic:

A+BC-->AB+C

A2+B2-->2AB

Explanation:

Trust Me

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