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3 years ago

Why is it important to understand forces?

1 answer:

3 0

If people never learned forces, there would be a major gap in the world and how it works, let alone in physics...
as much as you don't wanna admit it, force is everywhere and you see it if not use it EVERY day in your life, something as simple as driving a car down the street or too school, your using force of your wheels to move your car, which is moving you

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A 15-g bullet moving at 300 m/s passes through a 2.0 cm thick sheet of foam plastic and emerges with a speed of 90 m/s. Let's as

Shkiper50 [21]

Answer:

Explanation:

a) Change in momentum, Δp = mΔv = m(v - u) = (15 * 10-3) * (90 - 300) = -3.15 kg-m2

b) Acceleration of the bullet, a = (v2 - u2) / 2s = (902 - 3002) / (2 * 0.02) = -2047500 m/s2

So, the bullet is in contact with the plastic for the time, $\bigtriangleupt = \frac{(v - u)}{a} =\frac{(90 - 300)}{(-2047500)} = 1.03 \times 10^{-4} s$

c) Average force, $F_{avg} =\frac{\bigtriangleup p}{\bigtriangleup t} =\frac{(-3.15)}{(1.03 \times 10^{-4})} = 30.6 kN$

8 0

4 years ago

a straight wire that is 0.60m long and carrying a current of 2.0a is placed at an angle with respect to a magnetic field of stre

Rashid [163]

Answer:

The angle is $\theta = 30^o$

Explanation:

From the question we are told that

The length of the wire is $l = 0.60 \ m$

The current is $I = 2.0 \ A$

The magnetic field strength is $B = 0.30 \ T$

The magnitude of the magnetic force is $F _b = 0.18 \ N$

Generally the magnetic force exerted on the wire is mathematically represented as

$F_b = I * l * B * sin \theta$

Making $\theta$ the subject

$\theta =sin^{-1} [ \frac{ F_b }{I * l * B } ]$

substituting values

$\theta =sin^{-1} [ \frac{ 0.18 }{ 2.0 * 0.6 * 0.3 } ]$

$\theta = 30^o$

8 0

3 years ago

I'll give brainliest just please help me

Ira Lisetskai [31]

For number one the answer is decrease.

for number two is move in the driction of the force

for number three is unbalanced

hope this helps have a great day :)

6 0

3 years ago

Read 2 more answers

A 46.5-kg ball has a momentum of 57.2 kg m/s. What is the ball's speed?

Serhud [2]

Answer:

1.23 m/s

Explanation:

p=mv

57.2 = 46.5v

v= 57.2/46.5

v= 1.23