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2 years ago

Which type of wave can transmit energy through a vacuum?

Physics

2 answers:

m_a_m_a [10]2 years ago

4 0

The wave that can transmit energy through a vacuum is a electromagnetic wave

snow_lady [41]2 years ago

3 0

Answer:

Radio & Sound Waves

Explanation:

Electromagnetic Waves

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A 0.900 kg ornament is hanging by a 1.50 m wire when the ornament is suddenly hit by a 0.400 kg missile traveling horizontally a

just olya [345]

Explanation:

The given data is as follows.

Mass of the ornament ( $m_{1}$ ) = 0.9 kg

Length of the wire (l) = 1.5 m

Mass of missile ( $m_{2}$ ) = 0.4 kg

Initial speed of missile ( $u_{2}$ ) = 12 m/s

r = 1.5 m

According to the law of conservation of momentum,

$p_{i} = p_{f}$

$m_{1}u_{1} + m_{2}u_{2} = (m_{1} + m_{2})v$

Putting the given values into the above formula as follows.

$m_{1}u_{1} + m_{2}u_{2} = (m_{1} + m_{2})v$

$0.9 \times 0 + 0.4 \times 12 = (0.9 + 0.4)v$

0 + 4.8 = 1.3v

v = 3.69 m/s

Now, the centrifugal force produced is calculated as follows.

$F_{c} = (m_{1} + m_{2}) \times \frac{v^{2}}{r}$

= $(0.9 + 0.4) \times \frac{(3.69)^{2}}{1.5}$

= 11.80 N

Hence, tension in the wire is calculated as follows.

T = $F_{c} + (m_{1} + m_{2})g$

= $11.80 N + (0.9 + 0.4) \times 9.8$

= 24.54 N

Thus, we can conclude that tension in the wire immediately after the collision is 24.54 N.

4 0

2 years ago

List some reasons why growth characteristics are more useful on agar plates than on agar slants

SpyIntel [72]

Usually, in culturing of the bacteria we have a slant and then portion f it is transferred to the agar plate. The growth characteristics are more useful in the agar plates because it is where we really do the observation because bacteria in slants are still to be transferred in the agar plates.

5 0

2 years ago

Read 2 more answers

Kate is working on a project in her tech education class. She plans to assemble a fan motor. Which form of energy does the motor

grin007 [14]

The job that the fan is designed and built to do is to convert the electrical energy it uses into the kinetic (motion) energy of moving air.

I can't really guarantee that it accomplishes that with MOST of the electrical energy it uses, because I don't know how efficient your fan is. For example, if it's a really old fan, and one blade has the end broken off, and a lot of dust and mosquitoes have gotten into the motor, and it shakes and vibrates and makes a lot of noise when it's running, then it's converting a lot of the electrical energy into thermal energy (it gets hot when it runs) and some into sound energy too.

If you can live without the word "most" in the question, then we can assume that the fan is well designed and running like a top, and the answer is definitely choice-B .

4 0

2 years ago

a graph compares the weight and height of several different breeds of cat. What type of model is the graph?

pickupchik [31]

Answer: Mathematical Model

Explanation:

Took the test

3 0

2 years ago

An 8.0 m, 240 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground

sweet [91]

Answer:

5.7 m

Explanation:

AD = length of the ladder = L = 8 m

AB = distance of the center of mass of the ladder = (0.5) L = (0.5) 8 = 4 m

AC = distance of person on the ladder from the bottom end = x

W = weight of the ladder = 240 N

$F_{g}$ = weight of the person = 710 N

F = force by the wall on the ladder

N = normal force by ground on the ladder = ?

Using equilibrium of force along the vertical direction

N = $F_{g}$ + W

N = 710 + 240

N = 950 N

μ = Coefficient of static friction = 0.55

f =static frictional force on the ladder

Static frictional force is given as

f = μ N

f = (0.55) (950)

f = 522.5 N

Force equation along the horizontal direction is given as

F = f

F = 522.5 N

using equilibrium of torque about point A

F Sin50 (AD) = W Cos50 (AB) + ( $F_{g}$ Cos50 (AC))

(522.5) Sin50 (8) = (240) Cos50 (4) + (710) Cos50 (x)

x = 5.7 m

7 0

2 years ago