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madam [21]
3 years ago
11

Electromagnetic waves can transfer energy without a(n)____________.

Physics
1 answer:
liubo4ka [24]3 years ago
4 0

Answer:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Explanation:

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Three events are observed at a baseball game: I. A baseball is thrown by a pitcher. It starts from rest and is traveling at 38 m
SashulF [63]

Answer:

III. A baseball is traveling at 38 m/s when it hits a wall and bounces away from the wall at -38 m/s

Explanation:

The change in momentum of the baseball is a function of its change in velocity. And can be shown mathematically as;

∆p = m (∆v)

Where ∆p change in momentum

m mass of baseball

∆v change in velocity

Which implies that the higher the change in velocity of the baseball the higher the change in momentum.

I) ∆v = 38 - 0 = 38m/s

II) ∆v = 0 - 38 = -38m/s

III) ∆v = -38-38 = -76m/s

Therefore the third event have the highest change in velocity and thus have the highest change in momentum.

8 0
4 years ago
Please help me thank youuuu !!!!
True [87]

Answer:

D. Left

Explanation:

The question is worded weirdly, but based on the fact that heat transfers from hot to cold and the temperature on the right is warmer than the temperature on the left, I would say that the heat is flowing from the box on the right to the box on the left.

I hope this makes sense and was helpful! ☺

5 0
3 years ago
Read 2 more answers
What is the potential energy at Z
Over [174]

Answer:

It would be 2,500

Explanation:

The KE is 7,500 so the PE would be 2,500

7 0
3 years ago
In a lab, the mass of object A is 2.5 kg. Object A weighs:
kondor19780726 [428]
Weight of object = mass x acceleration due to gravity
                             =  2.5 x 9.8
                             =   24.5N

Hence option B is correct.
Hope this helps!!
5 0
4 years ago
Read 2 more answers
A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, wha
Paha777 [63]

Answer:

3.At equilibrium, its instantaneous velocity is at maximum

Explanation:

The motion of a mass on the end of a spring is a simple harmonic motion. In a simple harmonic motion, the total mechanical energy of the system is constant, and it is sum of the elastic potential energy (U) and the kinetic energy of the mass (K):

E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2 = const.

where

k is the spring constant

x is the displacement of the spring from equilibrium

m is the mass

v is the speed

As we see from the formula, since the total energy E is constant, when the displacement (x) increases, the speed (v) increases, and viceversa. Therefore, when the mass is at its equilibrium position (which corresponds to x=0), the velocity of the mass will be maximum.

7 0
3 years ago
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