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3 years ago

What is the definition magnetism

Physics

2 answers:

faust18 [17]3 years ago

7 0

Magnetism is a physical phenomenon produced by the motion of electric charge.

stiv31 [10]3 years ago

5 0

<span>a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.</span>

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What is the power of 10 when 157,821 is written in scientific notation?

vlabodo [156]

Answer:

The power of 10 in the given value is 5.

Explanation:

scientific notation is expressed in the decimal form. That means always written in the power of 10 form. The decimal place is put after 1 digit.

3 0

4 years ago

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A car traveling at 60 mph has how much more energy than a car going at 20 mph? How many times does the kinetic energy of a car i

irinina [24]

K.E. increases by 9 times

Explanation:

The kinetic energy of a car is given by:

$KE=\frac{1}{2}mv^2$

where

m is the mass of the car

v is its speed

From this definition, we see that the kinetic energy depends on the square of the velocity. Assuming that both cars have same mass, m, the kinetic energy of the first car is:

$K_1 = \frac{1}{2}m(60)^2$

while the kinetic energy of the second car is

$K_2 = \frac{1}{2}m(20)^2$

if we calculate the ratio, we get

$\frac{K_1}{K_2}=\frac{(60)^2}{(20)^2}=3^2 =9$

5 0

3 years ago

Read 2 more answers

Why do alpha particles and nuclei repel each other rather than attract eachother

Vesnalui [34]

Both have positive charge. In fact, an alpha particle IS a nucleus of a Helium atom.

5 0

3 years ago

Give an example of a situation in which you would describe an object's position in one dimension two dimensions three dimension

murzikaleks [220]

One dimension:
I'm waiting patiently for the elevator. What floor is it on now ?

Two dimensions:
What's the address of your house ?
Where do you want this picture hung on your bedroom wall ?
Where is the Maersk Skokie supertanker located today ?
Where are your rooks and pawns on the chessboard ?

Three dimensions:
I'm waiting at the airport for my brother to arrive.
He's on Flight AC3715.
Where is the flight located right now ?

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3 years ago

A tennis ball traveling horizontally at a speed of 40 m/s hits a wall and rebounds in the opposite direction. The time Interval

liubo4ka [24]

Answer

given,

initial velocity of the ball, u = 40 m/s

final velocity of the ball, v= -40 m/s

time of contact = 0.013 s

mass of the ball = 0.059 Kg

a) initial momentum

P₁ = m u = 0.059 x 40 = 2.36 kg.m/s

final momentum

P₂ = m v = 0.059 x (-40) = -2.36 kg.m/s

b) change in momentum

Δ P = P₂- P₁

Δ P = -2.36 - 2.36

Δ P = -4.72 kg.m/s

c) Average force

average force exerted by the ball is equal to change in momentum per unit time.

$F =\dfrac{\Delta P}{t}$

$F =\dfrac{-4.72}{0.013}$

F = -363 N

3 0

4 years ago