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3 years ago

1.A wagon with a mass of 20 kg is accelerating at 0.5 m/s2. What is the force on it?

Physics

1 answer:

erik [133]3 years ago

3 0

1). Force = (mass) x (acceleration)

Force = (20 kg) x (0.5 m/s )

Force = 10 Newtons

2). Force = (mass) x (acceleration)

In this case, the acceleration is the acceleration of gravity.

1 N = (mass) x (9.8 m/s )

Mass = (1 N) / (9.8 m/s )

Mass = 0.1 kg

3). Force = (mass) x (acceleration)

This formula is important. Memorize it !

You saw here that the same formula answered both of your questions.

It'll answer a lot more Physics questions that you haven't seen yet.

If you're taking a Physics class, there will DEFINITELY be at least one question on the final exam that will test you to see whether you know this formula and how to use it. Maybe more than one.

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Two obiect accumulated a charge of

tamaranim1 [39]

Answer:

A. 181.24 N

Explanation:

The magnitude of hte electrostatic force between two charged objects is given by the equation

$F=k\frac{q_1 q_2}{r^2}$

where

k is the Coulomb's constant

q1, q2 are the magnitudes of the two charges

r is the separation between the charges

In this problem, we have:

$q_1=4.5\mu C=4.5\cdot 10^{-6}C$ is the magnitude of the 1st charge

$q_2=2.8\mu C=2.8\cdot 10^{-6}C$ is the magnitude of the 2nd charge

r = 2.5 cm = 0.025 m is the separation between the charges

Therefore, the magnitude of the electric force is:

$F=\frac{(9\cdot 10^9)(4.5\cdot 10^{-6})(2.8\cdot 10^{-6})}{(0.025)^2}=181.44 N$

So, the closest answer is

A) 181.24 N

3 0

3 years ago

A loudspeaker located in air generates sound waves of frequency 1,000 Hz. Some of these sound waves enter a pool of water, where

prisoha [69]

Answer:

1.4 m

Explanation:

v = Speed of sound in water = 1400 m/s

f = Frequency of sound = 1000 Hz

$\lambda$ = Wavelength

When we multiply the frequency and the wavelength of a wave we get the velocity of sound in that medium

$v=f\lambda\\\Rightarrow \lambda=\dfrac{v}{f}\\\Rightarrow \lambda=\dfrac{1400}{1000}\\\Rightarrow \lambda=1.4\ m$

The wavelength of the sound waves in water is 1.4 m

8 0

3 years ago

Which planet has the most gravity and why

djyliett [7]

heya mate

the planet Jupiter has most gravity due to its size

7 0

3 years ago

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When a surfer rides an ocean wave on her surfboard, she is actually riding on. A. a crest that is toppling over. . B. a trough o

ruslelena [56]

The right answer to this question is A. a crest that is toppling over. When a surfer rides an ocean wave on her surfboard, she is actually riding on a crest. The crest is the point on a wave with the maximum value or upward displacement within a cycle.

8 0

3 years ago

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A ticker timer makes 50 dots per second. When a body is pulled by a tap through the timer, the distance between the third and fo

fenix001 [56]

Answer:

The acceleration is 1 cm/s^2.

Explanation:

The acceleration is defined as the rate of change of velocity.

Here, initial velocity, u = 3/1 = 3 cm/s

final velocity, v = 4/1 = 4 cm/s

time, t = 1 s

Let the acceleration is a.

Use first equation of motion

v = u + at

4 = 3 + 1 x a

a = 1 cm/s^2

8 0

3 years ago