PHYSICS HIGH SCHOOL

a crowbar having the lenght of 1.75 is used to balance a load of 500N if the distance between the fulcrum and the load is 0.5m find the effort applied to balance the load

Answers

Answer 1

Answer:

The effort applied = 200 N

Further explanation

Equilibrium :

$\tt F_1.d_1=F_2.d_2$

Total length = 1.75

The distance between the fulcrum and the load is 0.5 m ⇒ d₁=0.5 m

The distance between the fulcrum and the force applied :

$\tt 1.75-0.5=1.25~m\rightarrow d_2=1.25~m$

A load of 500N ⇒ F₁=500 N

The force applied :

$\tt 500* 0.5=F_2* 1.25\n\nF_2=(500* 0.5)/(1.25)=200~N$

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As you jump on a pogo stick where is the potential energy the greatest?

Answers

The potential energy would be greatest at the highest point of the jump; the kinetic energy equaling 0.

If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.

Answers

Answer:

$a_c=246.5 (m)/(s^2)$

Explanation:

The formula for centripetal acceleration is:

$a_c=rw^2$

Where,

$r:$ radius.

$w:$ Angular speed.

Angular speed is defined by:

$w=(\Delta\theta)/(\Delta t)$

Where,

$\theta:$ position angle.

$t:$ time.

In this case we have that the object takes 4.0 seconds to complete ten revolutions.

You have to know that 1 revolution = $2\pi rad$ , then

10 revolutions= $10.2\pi rad = 20\pi rad$

Replacing

$\Delta\theta=20\pi rad\n\Delta t=4.0s$

in the formula of Angular speed:

$w=(\Delta\theta)/(\Delta t)\n\nw=(20\pi rad)/(4.0s)$

$w=5\pi (rad)/(s)\nw=15.7(rad)/(s)$

Now we have,

$a_c=rw^2\na_c=r(15.7(rad)/(s))^2$

r=1.0m

$a_c=1.0m(15.7(rad)/(s))^2\n\na_c=1.0(246.5)(m)/(s^2) \n\na_c=246.5(m)/(s^2)$

Then the centripetal acceleration is:

$a_c=246.5 (m)/(s^2)$

a = ω²r

r = 1 m
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The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. what causes the nucleus of an isotope to be radioactive? Question 17 options: A. the net charge of the atom B. the attraction of protons to electrons C. an unstable ratio of protons and neutrons exposure to toxic chemicals D. too many electrons in its orbitals

Answers

Answer:The correct answer is option C.

Explanation:

Nuclear decay is shown by those nucleus in which there is an imbalance between the number of neutrons and protons.

If the ratio of neutrons to proton is 3:2 than it is a stable nucleus.

If the ratio of neutrons to protons is not 3:2 than the nucleus will said to be unstable nucleus and it will undergo nuclear decay in order to gain stability.

Hence, the correct answer is option C.

If a atom is raidoactive or unbalanced, Instability of a atom's nucleus may result form excess of either neutrons orprotons. Which means the answer is letter C

Which is more 3 tons or 6001 pounds

Answers

3 tonnes

The answer is 3 tonnes, because 3 tonnes equal 6613.87 pounds, which is higher than 6001.

I hope this helps! I would love it if you could help me answer my question too!

Final answer:

6001 pounds is slightly more than 3 tons. This is because, in the comparison scale, 1 ton is equal to 2000 pounds. So, 3 tons equals 6000 pounds.

Explanation:

The student is asking which is more, 3 tons or 6001 pounds. To determine this, we need to understand the relationship between tons and pounds. We know that 1 ton is equivalent to 2000 pounds. So, 3 tons would be equivalent to 3*2000 = 6000 pounds.

Hence, comparing 6001 pounds with 3 tons, or effectively 6000 pounds, 6001 pounds is slightly more than 3 tons.

Learn more about Weight comparison here:

brainly.com/question/26483814

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B. picking up a box off the floor

C. holding a tray in the cafeteria line

D. pushing a box across the floor

Answers

The following which is not an example of work is C. holding a tray in the cafeteria line because if force displaces an object it should work. I think it's clear and I am pretty sure this answer will help you.

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C. There would be twice as many extraterrestrial civilizations.
D. There would be four times as many extraterrestrial civilizations.

Answers

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