PHYSICS HIGH SCHOOL

A child sliding down the slide at a park is an example ofA. positive acceleration
B. negative acceleration
C. no acceleration
D. velocity

Answers

Answer 1
Answer: C, no acceleration will occur because he is an object at rest

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A bookshelf is 2m long, with supports at its end (p and q). A book weighing 10N is placed in the middle of the shelf. what are the upward forces acting on p and q. if the book is moved 50 cm from q, what are the forces at p and q now?

Answers

When the book is placed in the middle, the forces acting on p and q is 5N. When the book is moved 50 cm from q, the forces at p and q can be solved by doing a moment balance
With p as the pivot
Fq (2 m) = 10 N (0.5 m)
Fq = 2.5 N
and
Fp = 10 N - 2.5 N = 7.5 N 

Answer:

Fq = 2.5N

Fp = 7.5N

Explanation:

Hello! Let's solve this!

When the book is in the middle, the force in p (Fp) and the force in q (Fq) are equal, and half of the total force

Fp = Fq = 5N

When the book moves 0.5m from q we have a balance

Fq * 2m = 10N * 0.5m

We cleared Fq

Fq = (10N * 0.5m) / 2m

Fq = 2.5N

Fp = 10N-Fq = 10N-2.5N = 7.5N

Conclusion

Fq = 2.5N

Fp = 7.5N

An object is dropped from a height H above the ground. This free-falling object requires 1.02 s to travel the last 39 m before hitting the ground. From what height H above the ground did the object fall?

Answers

Answer:

H = 95.3 m

Explanation:

Let the height from which object fall down is H

so the total time to fall is given as

H = (1)/(2)gt^2

now it cover 39 m in last 1.02 s of its path

H - 39 = (1)/(2)g(t - 1.02)^2

so now we have

(1)/(2)gt^2 - 39 = (1)/(2)g(t - 1.02)^2

by solving above equation

t = 4.41 s

Now the total height is given as

H = (1)/(2)gt^2

H = (1)/(2)g(4.41)^2

H = 95.3 m

Kelly carried a box weighing 10 N the 200 meters from his car to his new house.  George took the box from Kelly and carried it up the 3 meter tall flight of stairs.  Who did more work?

Answers

While moving box from car to house
W = F * d * cosine (90 degree)
= 10N * 200m * 0 
= 0Nm

While lifing 3m tall flight of stairs
W=F*d*cosine(0 degree)
= 10N * 3m
= 300 Nm

George did more work

I think George did more work because George moved the box to the same direction as the force that he applied. So he is applying an upward force to the box to keep it from falling down and moving to the box up the stairs and Kelly does move the box farther than George, but he isn´t doing any work before the force he applies to the box on a different direction than movement.


Hope this helps


Tobey

5. An ion consist of 12 electrons and 11 proton. What is the charge
on the ion?

Answers

Answer:

-1

Explanation:

Electrons have a negative charge and protons have a positive charge. (+11) + (-12) = -1

Audition begins when sound waves strike the ________,causing it to vibrate. A) eardrum B) anvil C) stirrup D) cochlea

Answers

Answer: A) eardrum

Explanation: Audition refers to the sense of hearing. It is the process by which sound waves are perceived and interpreted by our brain. When sound waves enter the ear, they cause the eardrum to vibrate. These vibrations then travel further into the inner ear, leading to a chain of events that ultimately allows us to interpret and understand the sounds that we hear. Therefore, A is correct.

That's it!

When a compression wave travel through a median, which way does matter in the median move?

Answers

Matter will move upwards or outwards depending on the direction of the compression wave
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