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4 years ago

10

A net force of 40 N south acts on an object with a mass of 20 kg. What is the object's acceleration? (Hint: Use the formula a =

771

1 answer:

Marta_Voda [28]4 years ago

7 0

Answer:

2m/s2 south

Explanation:

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According to the big bang theory, the universe was once a very and hostile place.

brilliants [131]

According to the big bang theory, the universe was once a very C. hot and hostile place, and it expanded rapidly. This rapid expansion was the very reason it eventually cooled down and eventually got to its present state where all the planets and galaxies and what not were created.

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3 years ago

At a waterpark, sleds with riders are sent along a slippery, horizontal surface by the release of a large, compressed spring. Th

steposvetlana [31]

The sleds speed when the spring returns toits uncompressed length is v = 0.03 m/s.

<u>Explanation</u>:

Given,

force constant = 42 N/cm = 0.42 N/m, mass m = 68 kg, spring x = 0.39 m

The potential energy, U, stored in the spring is

U = 1/2 kx^2

= 1 / 2 $\times$ 0.42 $\times$ (0.39)^2

= 0.032 J

All its potential energy has been converted into kinetic energy since it has a uncompressed length.

K = 1/2 mv^2

v = sqrt (2K / m)

= √(( 2 $\times$ 0.032) / 68)

v = 0.03 m/s .

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4 years ago

Within a pendulum, as potential energy decreases, _____ energy increases.

Sonbull [250]

Kinetic Energy because when the pendulum is dropped its gravitational energy is transferred into kinetic energy as it gains speed.

6 0

4 years ago

3. What are the forces present on the rope?

irina1246 [14]

Answer:

The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.

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3 years ago

A sodium vapor lamp omit waves with the frequency of 5.26x10^14 Hz. What is the wavelength of light?

koban [17]

Answer:

$\lambda=5.70\times 10^{-7}\ m$

Explanation:

The frequency of a sodium vapor lamp, $f=5.26\times 10^{14}\ Hz$

We need to find the wavelength of light. The relation between wavelength, frequency and speed of light is given by :

$c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{5.26\times 10^{14}}\\\\\lambda=5.70\times 10^{-7}\ m$

So, the wavelength of light is equal to $5.70\times 10^{-7}\ m$ .

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3 years ago