PHYSICS HIGH SCHOOL

What is the mass of 2.5 mol of Ca, which has a molar mass of 40 g/mol?

Answers

Answer 1
Answer:

Answer:100 g of ca

Explanation:

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What is the velocity of the dart just before the collision?

Answers

Answer: 1.38 m/s to the right.

Explanation: We can solve this problem using the principle of conservation of momentum. The momentum of an object is defined as the product of its mass and velocity, and the total momentum of a closed system is conserved, meaning that the total momentum before a collision is equal to the total momentum after the collision.Let the initial velocity of the dart be v, and let the final velocity of the dart and the block be vf. The momentum of the dart before the collision is given by p = mv, where m is the mass of the dart. The momentum of the dart and block after the collision is given by (m + M)vf, where M is the mass of the block.Using the principle of conservation of momentum, we have:p = (m + M)vfSubstituting the given values, we get:0.012 kg v = (0.012 kg + 0.2 kg) 0.78 m/sSimplifying, we get:v = (0.212 kg) (0.78 m/s) / 0.012 kgv ≈ 1.38 m/sTherefore, the velocity of the dart just before it hits the block is approximately 1.38 m/s to the right.

A 4 kg vase sits on a shelf at a height of 1.2m. How much gravitational potential energy is added tot eh base when it is lifted to a shelf of height 1.4 m?

Answers

Gravitational Potential Energy = mgh

In this case the gravitational potential energy added is that as a result of the change in height.

           = mgΔh                g ≈ 9.8m/s²

           = mg(h₂ - h₁)
 
           = 4*9.8*(1.4 - 1.2)

           = 7.84J

GPE added = 7.84J

Answer:

7.84 J

Explanation:

Krishne wants to measure the mass and volume of a thimble. Which tools should she use?

Answers

To measure the mass, you would use a balance. To measure the volume, you can use a variety of ounces, cups, pints, quarts, and gallons. Good luck!

The brightest spot where the light directly hits an object.

Answers

Answer:

The highlight

A child lifts a 5.0-newton toy to a height of 0.50 meters. How much work is done on the toy?

Answers

you can use the formula

Work = force x distance

therefore, 

W= (5.0)(.50)
W = 2.5 joules

hope this helps :)
Work done=mgh
W=force*height
W=5N*0.50mts
W=2.5joule

A cannon tilted upward at θ = 30 ∘ fires a cannonball with a speed of 94 m/s .

Answers

Answer:

i think 30

Explanation:

because the 0-30
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