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dolphi86 [110]
4 years ago
14

Jeffrey is on his skateboard and starts skating down a ramp. Ten seconds later he is travelling at

Chemistry
1 answer:
AfilCa [17]4 years ago
7 0

Answer: 2m/s^2

Explanation:

Velocity of skateboard = 20.0 m/s.

Time taken = Ten seconds (10 s)

Acceleration ​= ?

Recall that acceleration is the change in velocity of a body per unit time.

i.e Acceleration = (velocity / Time)

Acceleration = 20.0m/s ➗ 10 s

Acceleration = 2m/s^2

Thus, Jeffrey acceleration was 2m/s^2

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Can someone please help with chemistry? Lead has a density of 10.5 g/cm^3. What is the diameter of a lead ball that has a mass o
adelina 88 [10]
Density = Mass / Volume

10.5 = 500 / x

10.5x = 500

x = 50 cm^3 (1 sig fig) volume of the sphere

Volume of a sphere = 4/3 pi r^2

pi = 3.14 r = radius

50 = 4/3 pi r^3

50•3/4 = pi r^3

37.5 = pi r^3

37.5/pi = r^3

11.9 = r^3

cube root(11.9) = r

2.3 = r

Diameter = 2•radius

Diameter = 2 • 2.3

Diameter = 5 cm (1 sig fig) diameter



3 0
3 years ago
Brandon is trying to remember how the physical and chemical properties of metals, nonmetals, and metalloids compare. He wrote so
g100num [7]

Answer:

The correct ones are:

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7 0
3 years ago
Occurs when energy is added or removed
stepan [7]

Answer:

melting

Explanation:

one change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.

5 0
3 years ago
Which of the following is teue of solids? A. They have less kinetic energy than liquids, gases, and plasmas. B.They have slightl
Oksi-84 [34.3K]
The correct answer is A because particles in solids are packed more compactly than those in liquids, gases, and plasmas, due to the decreased kinetic engergy

Hope this helps
8 0
3 years ago
What produces the magnetic force of an electromagnet?
bagirrra123 [75]

Answer:

movement of charged particles through the wire .

Explanation:

When electricity is passed through the wire of electromagnet , moving electrons of the wire produces magnetic field . This magnetic field in increased due to high permeability of soft iron of the electromagnet . It is this magnetic field which creates magnetic force .

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