PHYSICS HIGH SCHOOL

Manuel releases a pendulum bob. The drawing shows its path. After the pendulum bob is released, how does the kinetic energy change?A.
It does not change.

B.
From C to D, it increases.

C.
From C to D, it decreases.

D.
It continues to increase as it swings back and forth.
Manuel releases a pendulum bob. The drawing shows its path. - 1

Answers

Answer 1
Answer: From C to D, it increases.

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Ted wants to hang a wall clock on the wall by using a string. If the mass of the wall clock is 0.250 kilograms, what should be the tension of the string so that it can sustain the weight of the wall clock?

Answers

The clock is pulling the force towards earth's center because of gravity.
That force is equal to:
F = m*g   where g is gravitational acceleration. 

We will take that g = 9.81m/s^2

Now:
F = 0.25 * 9.81 = 2.4525 N

The string needs to sustain that force, therefore minimum Force that string has to be able to sustain is:
2.4525 N

The answer is 2.45 newtons because 1 kg = 9.8 newtons so when we use that ratio, we get around 2.45 newtons for 0.25 kg. This would be your (B) option I think.

What do you mean by average velocity​

Answers

Answer:

Here is the answer. Hope this helps you!

Explanation:

Average velocity is the sum of initial and final velocity divided by 2. I t is the same as total Displacement divided by total time. Average velocity is calculated when the body is in non-uniform motion (also when total displacement and time is not given). The formula is as follows:

u + v/2 = v_(av)

Average velocity = Average speed

during motion in a straight line. therefore, the above mentioned formula can be used for calculating average speed as well, when the direction is one and only the same, that is, during motion in a straight line. The S.I unit remains the same-

m/s.

Since velocity is vector, average VELOCITY is also vector. However, Average SPEED is scalar as speed is scalar. both can be equal only when the distance = displacement and when they are following the same direction of motion.

The velocity of a car traveling in a straight line increases from 0 meters/second to 30 meters/second in 8 seconds. What is the average acceleration of the car?

Answers

Answer : a=3.75\ m/s^2

Explanation :

Initial velocity of the car, u = 0 m/s

Final velocity of the car, v = 30 m/s          

Time taken, t = 8 s

Average acceleration of the car is defined as the change in velocity divided by time.

a=(v-u)/(t)

a=(30\ m/s-0)/(8\ s)

a=3.75\ m/s^2

Hence, this is the required solution.                                              
Average acceleration is how much the car increases (on average) per second.  So, since it increases by 30 m/s in 8 s, then dividing 30 by 8 will give you an average acceleration of 3.75 m/s^2 (remember that acceleration is ever increasing, so the unit is s^2, not just s)

Hope this helps!

A skier has an acceleration of 2.5 m/s2. How long does it take her to come to a complete stop from a speed of 18 m/s?

Answers

(Assuming acceleration is -2.5m/s2) 7.2 seconds.
a = 2.5 m/s²

since , we have to stop so v = 0 m/s ( final velocity)

u = 18 m/s

t = ?

using ,

⇒ v = u + at

⇒ 0 = 18 + 2.5t

by this we are getting t<0 , since , t cant be -ve , Check your question

In a skateboard race, the winner covered 26 meters in 3.88 seconds . What was his speed?

Answers

26meter/3.88seconds=6.70m/s

A 2000-kg car traveling at 40m/s hits a wall with a force of 40,000N and comes to a stop what was the impact time?A-0.5s
B-2s
C-400s
D-800s

Answers

Answer:

Option (B)

Explanation:

mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,

Force, F = 40,000 N, Final velocity, v = 0 m/s

Let the impact time be t.

By use of Newton's second law

F = m a

where, a be the acceleration and m be the mass.

40000 = 2000 x a

a = 20 m/s^2

Acceleration is negative because the car is stopped.

Use first equation of motion,

v = u + a x t

0 = 40 - 20 x t

t = 2 second
D- 800 s I think I did (40,000)(40)/2000 idk if this is the right answer
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