All categories

3 years ago

What are electromagnetic waves?

Physics

2 answers:

dezoksy [38]3 years ago

7 0

The answer is d (electric magnetic fields)

spin [16.1K]3 years ago

6 0

Dddddddddddddddddddddd

You might be interested in

A balloon contains helium gas. Which applies to the volume of the gas in the balloon when pressure is increased at constant temp

svetlana [45]

Answer:

the volume of the gas decreases

Explanation:

As a balloon rises through the atmosphere, the air pressure around it decreases and the balloon expands.

Good luck!

8 0

3 years ago

A skater extends her arms horizontally, holding a 5-kg mass in each hand. She is rotating about a vertical axis with an angular

sp2606 [1]

Answer:

$1.98$ rev/s

Explanation:

$m$ = mass attached to each hand = 5 kg

$r_{i}$ = initial distance of masses in each hand = 1 m

$r_{f}$ = final distance of masses in each hand = 0.1 m

$I$ = moment of inertia of body = 5 kgm²

$I_{i}$ = initial total moment of inertia = $I + 2 mr_{i}^{2}$

$w_{i}$ = initial angular velocity = 1 rev/s

$I_{f}$ = final total moment of inertia = $I + 2 mr_{f}^{2}$

$w_{f}$ = final angular velocity = ?

Using conservation of angular momentum

$I_{i} w_{i} = I_{f} w_{f}$

$(I + 2 mr_{i}^{2}) w_{i} = (I + 2 mr_{f}^{2}) w_{f}$

$(5 + 2 (5) (1)^{2}) (1) = (5 + 2 (5) (0.1)^{2}) w_{f}$

$w_{f} = 2.94$ rev/s

3 0

4 years ago

Read 2 more answers

Solar energy can be changed into thermal energy without any work being done. true or false

Black_prince [1.1K]

Answer:

True

Explanation:

3 0

3 years ago

A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the s

tankabanditka [31]

Answer:

$80 m/s^2$

Explanation:

The acceleration of an object is given by:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time interval it takes for the velocity to change from u to v

For the rocket in this problem,

u = 20,000 m/s

v = 24,000 m/s

t = 55.0 - 5.0 = 50.0 s

Substituting,

$a=\frac{24000-20000}{50}=80 m/s^2$

7 0

3 years ago

A 23 kg body is moving through space in the positive direction of an x axis with a speed of 130 m/s when, due to an internal exp

babymother [125]

Answer:

a) Vx = 1088m/s

b) Vy = -162.93m/s

c) 5246745J

Explanation:

Mass of unbroken body = 23kg

Its velocity along +ve X-axis = 130m/s

Mass of first broken body, m1= 9.4kg

Its velocity along +ve X-axis = 130m/s

Nass of 2nd broken body, m2 = 6.1kg

Its velocity long-lived X - axis = -550m/s

Mass of 3rd broken body = ?

m3 = (23 - 9.4 - 6.1)kg

m3 = 7.5kg

Let velocity along the x-axis = Vx

Let the velocity along the x-axis = Vy

Applying law of conservation of momentum along x-axis

a) m1×0 + m2×(-550) + m3×(Vx) =M × 130

9.4 × 0 + 6.1× (-550) + 7.5(Vx) = 23 ×130

0 + (-5170) + 7.5Vx = 2990

2990 + 5170 = 7.5Vx

8160 = 7.5Vx

Vx = 8160/7.5

Vx = 1088m/s

b) Aplying conservation of momentum along the x-axis

(m1×130) + (m2 × 0) + (m3× Vy) = 0

(9.4 × 130) + (6.1 ×550) + 7.5Vy = 0

1222 + 0 + 7.5Vy = 0

1222 = -7.5Vy

Vy = 1222/(-7.5)

Vy = -262.93m/s

c) The energy released or change in KE is given by:

1/2[(m1v1^2) + (m2v2^2) +(m3Vx^2) ]= MV^2

Change in KE = 1/2[ 9.4× 130^2 + 6.1 × 550^2 + 7.5 × 1088^2 ] - 1/2(23 × 130^2)

Change in KE = 1/2[158860 + 1845250 + 8878080] - 1/2[388700]

Change in KE = 5441095 - 194350

Change in KE = 5246745J

4 0

3 years ago