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tresset_1 [31]
3 years ago
13

Which of these is the best explanation for why 2 negatively charged balloons if put close repel

Physics
1 answer:
Scilla [17]3 years ago
5 0
Opposite charges attract; like charges repel :)
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A basketball has a mass of 567 g. Heading straight downward, in the direction, it hits the floor with a speed of 2 m/s and rebou
Vsevolod [243]

Answer:

\Delta p=2.27\frac{kg\cdot m}{s}

Explanation:

The momentum change is defined as:

\Delta p=p_f-p_i\\\Delta p=mv_f-mv_i\\\Delta p=m(v_f-v_i)(1)

Taking the downward motion as negative and the upward motion as positive, we have:

v_f=2\frac{m}{s}(2)\\v_i=-2\frac{m}{s}(3)

Replacing (2) and (3) in (1):

\Delta p=567*10^{-3}kg(2\frac{m}{s}-(-2\frac{m}{s}))\\\Delta p=2.27\frac{kg\cdot m}{s}

5 0
3 years ago
A car has two horns, one emitting a frequency of 199 hz and the other emitting a frequency of 203 hz. what beat frequency do the
andriy [413]
Beat frequency, fb = |f2-f1|

That is, beat frequency is the absolute difference between two frequencies. Is is as a results of destructive and constructive inferences.

Therefore, in this case:

fb = 203 - 199 = 4 Hz
3 0
3 years ago
An electromagnetic wave has a frequency of 1.0 x 10^5. What is the wavelength of the wave?
SashulF [63]

Answer:

The frequency , speed and wavelength of an electromagnetic wave are related by the formula

Speed = frequency x wavelength

frequency = speed / wavelength

substituting the values

frequency = 3 x #10 ^8# m /s / 1 x #10^15# m

= 3 x #10^-7# /s

6 0
2 years ago
Read 2 more answers
A model rocket accelerates at 15.3 m/s2 with a force of 44 N.
melamori03 [73]
To calculate the mass of the body moving, we use Newton's second law of motion which is F = ma where F is the force, m is the mass of the object and a is its acceleration.

F = ma
44 = m(15.3)
m = 2.9 kg

The mass of the rocket would be 2.9 kg.
8 0
3 years ago
Read 2 more answers
A table with mass 23.5 kg sits on the ground what is the normal force on the table?
marin [14]

Answer:

C

Explanation:

There are two forces on the table: weight and normal force.  Newton's second law:

∑F = ma

N - mg = 0

N = mg

N = (23.5 kg) (9.81 m/s²)

N = 230 N

6 0
3 years ago
Read 2 more answers
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