Ask question

Ask question

All categories

3 years ago

15

How shadows are formed?

1 answer:

Y_Kistochka [10]3 years ago

4 0

Answer:

Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow.

Explanation:

Hope it is helpful.....

You might be interested in

An electron has a velocity of 1.50 km/s (in the positive x direction) and an acceleration of 2.00 ✕ 1012 m/s2 (in the positive z

olga nikolaevna [1]

Answer:

see explanation

Explanation:

Given that,

velocity of 1.50 km/s = 1.50 × 10³m/s

acceleration of 2.00 ✕ 1012 m/s2

electric field has a magnitude of strength of 18.0 N/C

$\bar F= q[\bar E + \bar V \times \bar B]\\\\\bar F = [\bar E + \bar V \times ( B_x \hat i +B_y \hat j +B_z \hat z )]\\\\\\m \bar a = [\bar E + \bar V \times ( B_x \hat i +B_y \hat j +B_z \hat z )]$

$9.1 \times 10^-^3^1 \times 2\times 10^1^2 \hat k=-1.6\times10^-^1^9 \hat k [18\hat k+ 1.5\times 10^3 \hat i \times (B_x \hat i +B_y \hat j +B_z \hat k)]$ $42.2 \times 10^-^1^9 \hat k = -2.4 \times 10^1^6B_y \hat k + 2.4 \times 10 ^1^6 \hat j B_z\\$

$B_x = undetermined$

$B_y = \frac{42.2 \times 10^-^1^9}{-2.4 \times 10^-^1^6} \\\\= - 0.0176 T$

$B_z = 0T$

8 0

4 years ago

For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?

Thepotemich [5.8K]

The sum of all forces on an object is called the "net" force on it.

For an object at rest, we call that sum of forces "zero".

8 0

3 years ago

Read 2 more answers

I need help with question 8 and 9

Wewaii [24]

8) The height of the shelf is 2.04 m

9) The gravitational potential energy is 100 J

Explanation:

8)

The gravitational potential energy of an object is given by:

$PE=mgh$

where

m is the mass of the object

g is the acceleration of gravity

h is the heigth of the object, relative to the ground

For the object in this problem, we have

m = 10 kg

$g=9.8 m/s^2$

And we know that

PE = 200 J

Therefore we can re-arrange the formula to solve for h, the heigth of the object:

$h=\frac{PE}{mg}=\frac{200}{(10)(9.8)}=2.04 m$

9)

As before, the gravitational potential energy of the object is given by:

$PE=mgh$

where in this case, we have:

m = 10 kg is the mass of the object

h = 2.04 m is the height of the object from the ground

While in this case, the acceleration of gravity on this planet is

$g=4.9 m/s^2$

Substituting,

$PE=(10)(4.9)(2.04)=100 J$

Learn more about potential energy:

brainly.com/question/1198647

brainly.com/question/10770261

#LearnwithBrainly

7 0

4 years ago

A 230 g air-track glider is attached to a spring. The glider is pushed in 8.2 cm and released. A student with a stopwatch finds

Natasha_Volkova [10]

Answer:

4.3 N/m

Explanation:

m = 230 g = 0.230 kg, x = 8.2 cm

in 13 oscillations, time taken = 19 s

In 1 oscillation, time taken = 19 / 13 = 1.46 s

By the use of formula of time period , Let k be the spring constant.

$T = 2\pi \sqrt{\frac{m}{k}}$

$1.46 = 2\pi \sqrt{\frac{0.230}{k}}$

0.054 = 0.230 / k

k = 4.26 N/m

k = 4.3 N/m

8 0

3 years ago

Which of the following contains the most thermal energy?

Evgesh-ka [11]

<span>c. a hot tub full of hot water</span>

5 0

4 years ago