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3 years ago

If a 16 N net force makes an object accelerate at 4 m/s2, what is the mass of the object?

Physics

1 answer:

12345 [234]3 years ago

4 0

Answer:

4 kg

Explanation:

Acceleration = 4 m/s^2

Force = 16 N

Force = mass * acceleration

mass = force / acceleration

mass = 16 / 4

mass = 4 kg

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A research study that produces a correlation coefficient of -0.90 indicates _

mario62 [17]

The absolute awser is b

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3 years ago

A car went 60 km in 5/6 of an hour while a second car went 54 km in 2/3h. Which car was faster? How many times faster?

Nastasia [14]

Answer:

The car that went 54 km in 2/3h was faster, 5/4 times faster than the other car

Explanation:

Average speed of a car is the ratio between the displacement $\Delta x$ and the time (t) it takes to do that displacement:

$V_{avg}=\frac{\Delta x}{t}$

So, for the first car:

$V_{avg1}=\frac{60km}{\frac{5h}{6}} =72\frac{km}{h}$ (1)

for the second car we have:

$V_{avg2}=\frac{60km}{\frac{2h}{3}} =90\frac{km}{h}$ (2)

So, the second cart is faster than the first one. To find how many times divide speed 2 by speed 1:

$\frac{90}{72}=\frac{5}{4}$

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3 years ago

Bats rely on sound localization to be able to fly during the night. on a cool 20 °c summer night, a bat produces an ultrasonic s

rjkz [21]

The unit of frequency, kHz, is also equivalent to 1/kilosecond or 1/1000 seconds. The equation relating wavelength and frequency is:

c = wavelength*frequency, where c is known as the speed of light. But since we are dealing with ultrasound, we use the speed of sound. The speed of sound is dependent on the temperature. The correlation would be:

c = 331 + 0.6T = 331 + 0.6(20°C) = 343 m/s

Therefore,

343 = wavelength * 1/1000
wavelength = 343,000 meters

4 0

4 years ago

Calculate the average velocity of a motor cycle that travels 72km/hr in 20 seconds

Gekata [30.6K]

Answer:

The average velocity of the motor cycle in m/s = 20 m/s

Explanation:

Given;

average velocity of the motor cycle, v = 72 km/h

time of motion, t = 20 s

The average velocity is already given in the question, the time in the question is irrelevant.

You can also convert the 72 km/h to m/s by dividing by 3.6 km/h

Thus, 72 km/h divided by 3.6 km/h = 72 / 3.6 = 20 m/s

Therefore, the average velocity of the motor cycle in m/s = 20 m/s

8 0

3 years ago

Find electric field at point p which is a distance l away from the both +q and -q

denis-greek [22]

Answer:

$\frac{1}{4\times(pie)\times\text{E}} \times\frac{q}{I^{2} }+\frac{1}{4\times(pie)\times\text{E}} \times\frac{-q}{I^{2} }$

Explanation:

As given point p is equidistant from both the charges

It must be in the middle of both the charges

Assuming all 3 points lie on the same line

Electric Field due a charge q at a point ,distance r away

$=\frac{1}{4\times(pie)\times\text{E}} \times\frac{q}{r^{2} }$

Where

q is the charge
r is the distance
$E$ is the permittivity of medium

Let electric field due to charge q be F1 and -q be F2

I is the distance of P from q and also from charge -q

⇒

F1 $=\frac{1}{4\times(pie)\times\text{E}} \times\frac{q}{I^{2} }$

F2 $=\frac{1}{4\times(pie)\times\text{E}} \times\frac{-q}{I^{2} }$

⇒

F1+F2= $\frac{1}{4\times(pie)\times\text{E}} \times\frac{q}{I^{2} }+\frac{1}{4\times(pie)\times\text{E}} \times\frac{-q}{I^{2} }$

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4 years ago