3 years ago

In all chemical reactions, and __ must be conserved. energy, matter atoms, heat enthalpy, energy

Physics

1 answer:

Aleksandr-060686 [28]3 years ago

6 0

Energy and matter atoms is the correct answers. Mass or matter can not be created nor destroyed.

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A 10.-newton force is required to hold a stretched spring 0.20 meter from its rest position. What is the potential energy stored

tester [92]

Data:
Ep = ? (Joule)
if: F = k.x → F = 10 N
x (displacement) = 0.20 m

Formula:
$Ep = \frac{F*x}{2}$

Solving:
$Ep = \frac{F*x}{2}$
$Ep = \frac{10*0.20}{2}$
$Ep = \frac{2}{2}$
$\boxed{\boxed{Ep = 1\:Joule}}\end{array}}\qquad\quad\checkmark$

4 0

3 years ago

A 4 kg bowling ball rolls at a speed of 5 m/s on the roof of a building that is 30 meters tall. What is its kinetic energy?

klasskru [66]

ans: B

Kinetic energy = $\frac{1}{2} mv^{2}$

= $\frac{1}{2} (4)(5^{2} )$

= 50J

ps. the height will only affect its potential energy, not kinetic.

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2 years ago

A 20-cm-long spring is attached to a wall. When pulled horizontally with a force of 100 N, the spring stretches to a length of 2

Delvig [45]

Answer:

the length of stretched spring in cm is 22

Explanation:

given information:

spring length, x1 = 20 cm = 0.2 m

force, F = 100 N

the length of spring streches, x2 = 22 cm = 0.22 m

According to Hooke's law

F = - kΔx

k = F/*=(x2-x1)

= 100/(0.22 - 0.20)

= 5000 N/m

if the spring is now suspended from a hook and a 10.2-kg block is attached to the bottom end

m = 10.2 kg

W = m g

= 10.2 x 9.8

= 99.96 N

F = - k Δx

Δx = F / k

= 99.96 / 5000

= 0.02

Δx = x2- x1

x2 = Δx + x1

= 0.20 + 0.02

= 0.22 m

= 22 cm

7 0

2 years ago

If a rocket travels 35,200 miles in 2 hours, what is its speed?

Brrunno [24]

Answer:

Given:

Distance = 35200 miles, time = 2 hr.

So we know = 35200/ 2, = 17600 miles / hr.

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2 years ago

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Which of the following statements about matter is true? Mass and matter are always the same. Matter is made up of atoms and has

Zepler [3.9K]

The correct answer is Matter is made up of atoms and has mass.

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2 years ago

In all chemical reactions, __________ and ____________ must be conserved. energy, matter atoms, heat enthalpy, energy

In all chemical reactions, and __ must be conserved. energy, matter atoms, heat enthalpy, energy