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3 years ago

Electromagnetic waves differ from other types of waves because they are (2 points)

Physics

1 answer:

saveliy_v [14]3 years ago

7 0

Answer:

b. able to travel through a vacuum.

Explanation:

The most distinguishing factor of an electromagnetic waves is that they are able to travel through a vacuum.

These waves do not require materials in a medium for propagation.

Electromagnetic waves are formed by the propagation of the electric and magnetic fields.
They vibrate at an angle of 90° .
They are unlike like mechanical waves that requires that requires materials in medium for their propagation.

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A motorcycle is following a car that is traveling at constant speed on a straight highway. Initially, the car and the motorcycle

aalyn [17]

Answer:

4.56 s

Explanation:

Let t (seconds) be the time it takes from the moment when the motorcycle starts to accelerate until it catches up with the car. Since prior to this they are traveling at constant speed, they would have maintained a distance of 52 m before accelerating.

The distance traveled by the car, with respect the motorcycle position when it start accelerating is

$s_c = s_0 + v_ct = 52 + 19t$

The distance traveled by the motorcycle after accelerating, with respect the motorcycle position when it start accelerating is

$s_m = v_mt + at^2/2 = 19t + 5t^2/2$

When the motorcycle catches up to the car, their position are at the same

$s_c = s_m$

$52 + 19t = 19t + 5t^2/2$

$52 = 5t^2/2$

$t^2 = 20.8$

$t = \sqrt{20.8} = 4.56 s$

5 0

3 years ago

Scientists discovered that the level of deuterium in comets forming in the Kuiper Belt is nearly identical to the level found in

malfutka [58]

Options:

The impact of Earth’s gravity on the decay rate of deuterium is the same as the impact of microgravity.
Most of the water that forms the oceans of Earth arrived by way of impacts with Kuiper Belt comets.
Most comets formed from deuterium-based water that was stripped away from early Earth by solar radiation.

Answer:

Most of the water that forms the oceans of Earth arrived by way of impacts with Kuiper Belt comets.

Explanation:

Note, a comet is a celestial body made of ice which releases gases when it orbits close to the Sun. Deuterium is a type of element which can be found in comets and in our oceans on earth. Deuterium is considered an isotope of hydrogen.

Hence, because of the similarities between the Deuterium and Hydrogen, some scientists promote the theory that most of the water that forms on oceans of the earth likely arrived by the impact with Kuiper Belt comets.

3 0

3 years ago

If mass is conserved during a nuclear reaction, then _____.

aleksley [76]

Then, the reaction does not have any kinetic energy

7 0

4 years ago

On a frictionless horizontal surface, a 1.50 kg mass traveling at 3.50 m/s collides with and sticks to a 3.00 kg mass that is in

My name is Ann [436]

Answer:

√ $\frac{3}{5} m$

Explanation:

Hope it helps!.

4 0

3 years ago

A student drops a 0.4kg ball from a height a of 49m above the ground. Neglect drag. Answer each of the following questions about

Elan Coil [88]

• The only force acting on the ball, and thus the net force, is due to its own weight, with magnitude

w = m g = (0.4 kg) (9.8 m/s²) ≈ 3.9 N

pointing downward.

• The ball is in free fall, so its acceleration is g = 9.8 m/s² (also pointing downward).

• The ball is dropped from a height of 49 m, so its height y at time t is

y = 49 m - 1/2 g t ²

Set y = 0 and solve for t :

0 = 49 m - 1/2 g t ²

t ² = (98 m) / g

t = √((98 m) / g) = √(10) s ≈ 3.2 s

• The ball's velocity v at time t is

v = - g t

so that at the time found previously, the ball will have attained a velocity of

v = - g (3.2 s) ≈ -31 m/s

and thus a speed of about 31 m/s.

4 0

3 years ago