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4 years ago

Consider the following kinds of electromagnetic waves:

Physics

1 answer:

marysya [2.9K]4 years ago

7 0

Answer:

According to wavelengths in descending order: C, B, D, E and A

According to frequencies in descending order: A, E, D, B and C

According to speeds in vacuum: A =B =C =D =E

Explanation:

in the EM spectrum, radio waves have the longest wavelength while gamma rays have the shortest wavelength.

All EM waves travel with the same speed of $3*10^8m/s$ in a vacuum.

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What is the effect on the force of gravity between two objects if the mass of one object remains unchanged while the distance to

drek231 [11]

Answer:

The force of gravity after you double the mass and the distance is half of the initial force: $F_{2}=\frac{1}{2}F_{1}$

Explanation:

The initial force of gravity is:

$F_{1}=\frac{Gm_{1}m_{2}}{r^2}$

where $G$ is the universal gravitational constant, $m_{1}$ is the mass of the first object, $m_{2}$ is the mass of the second object, and $r$ is the distance between the objects.

If the mass of the second object is doubled, now we have $2m_{2}$ , and if the distance between the objects is also doubled instead of $r$ now we have $2r$ .

So the force of gravity now is:

$F_{2}=\frac{Gm_{1}(2m_{2})}{(2r)^2}\\ F_{2}=\frac{2Gm_{1}m_{2}}{4r^2} \\F_{2}=\frac{1}{2} \frac{Gm_{1}m_{2}}{r^2}$

and we know that $F_{1}=\frac{Gm_{1}m_{2}}{r^2}$

so the new force of gravity is:

$F_{2}=\frac{1}{2}F_{1}$

The force of gravity after you double the mass and the distance is half of the initial force.

3 0

3 years ago

Kyle, a 80.0 kg football player, leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the 0.

vagabundo [1.1K]

Answer:

The velocity of ball is 23.19 m/s

Explanation:

Given that,

Mass of football player = 80.0 kg

Mass of ball = 0.430 kg

Distance = 0.538

We need to calculate the time

Using equation of motion

$s = ut+\dfrac{1}{2}gt^20.538=0+\dfrac{1}{2}\times9.8\times t^2t^2=\dfrac{2\times0.538}{9.8}t=\sqrt{\dfrac{2\times0.538}{9.8}}t=0.33\ sec$

We need to calculate the velocity

Using formula of velocity

$s=v\times tv=\dfrac{s}{t}\\Put the value into the formula\\v=\dfrac{0.0409}{0.33}\\v=0.124\ m/s\\$

We need to calculate the velocity of ball

Using conservation of momentum

$m_{1}v_{1}+m_{2}v_{2}=mv$

Put the value into the formula

$80.0\times0.124+0.430\times0.124=0.430\times v\\v=\dfrac{9.97332}{0.430}\\v=23.19\ m/s$

The velocity of ball is 23.19 m/s

3 0

4 years ago

Read 2 more answers

During which segments is kinetic energy decreasing?<br> A)1,2,3<br> B) 4,5<br> C)1,3,5<br> D)2,4

Nutka1998 [239]

Answer:

Explanation:

kinetic energy is energy an object has due to its movement. for instance, if someone was riding down a hill, when the motion of the bike begins to decrease so does the kinetic energy

3 0

3 years ago

Read 2 more answers

In the figure, if Q = 52 µC q =10 µC and d = 55 cm, what is the magnitude of the electrostatic force on q?

GenaCL600 [577]

Answer:

F = 15.47 N

Explanation:

Given that,

Q = 52 µC

q = 10 µC

d = 55 cm = 0.55 m

We need to find the magnitude of the electrostatic force on q. The formula for the electrostatic force is given by :

$F=k\dfrac{q_1q_2}{d^2}\\\\F=9\times 10^9\times \dfrac{52\times 10^{-6}\times 10\times 10^{-6}}{(0.55)^2}\\\\F=15.47\ N$

So, the magnitude of the electrostatic force is 15.47 N.

4 0

3 years ago

You estimate the radius of the big wheel to be 19 m

posledela

Explanation:

first, find the circumference of the wheel by using the formula 2(pi)(r):

2(pi)(19) = 119.380521

divide by 25 secs

119.380521/25 = 4.77522083

round to the nearest tenth is 4.8, so the speed is 4.8mm/sec

7 0

4 years ago