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jasenka [17]
3 years ago
8

A force of 20 N acts acts on an object of 4.0 kg mass that is initially at rest. What is the resulting acceleration of the objec

t? How far does the object travel in 6 .0 seconds?
Physics
1 answer:
ki77a [65]3 years ago
4 0

Answer:

Explanation:

Acceleration = Force/ mass = 20/4 = 5 m/s².

acceleration a = 5 m/s² , initial velocity u = 0 , time t = 6 s

S = ut + 1/2 a t² = 0 + 1/2 x 5 x 6² = 90 m .

distance traveled = 90 m.

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A violin string vibrates at 260 Hz when unfingered. At what frequency will it vibrate if it is fingered one fourth of the way do
Advocard [28]

Answer:

346.66 Hz

Explanation:

l_1 = Length of string which is unfingered = l

l_2 = Length of string which is vibrate when fingered = l-\dfrac{1}{4}l=\dfrac{3}{4}l

f_1 = Unfingered frequency = 260 Hz

f_2 = Fingered frequency

Frequency is inversely proportional to length

f=\dfrac{1}{l}

So,

\dfrac{f_1}{f_2}=\dfrac{l_2}{l_1}\\\Rightarrow \dfrac{f_1}{f_2}=\dfrac{\dfrac{3}{4}l}{l}\\\Rightarrow \dfrac{f_1}{f_2}=\dfrac{3}{4}\\\Rightarrow f_2=\dfrac{4}{3}f_1\\\Rightarrow f_2=\dfrac{4}{3}260\\\Rightarrow f_2=346.66\ Hz

The frequency of the fingered string is 346.66 Hz

3 0
3 years ago
A graduated cylinder contains 17.5 ml of water. When a metal cube is placed onto the cylinder, its water level rises to 20.3 ml.
igomit [66]

Answer:

V=2.8 ml

Explanation:

volume of the cube is it would be 20.3 - 17.5 ml so 2.8 ml.

8 0
4 years ago
To complete a project, 200,000 Joules of work is needed. The time taken to complete the project is 20 seconds. How much power is
Leno4ka [110]

Answer:

10,000

Explanation:

200,000/20 = power needed

200,000/20 = 10,000

Hope this Helps!

5 0
3 years ago
Read 2 more answers
Convert i) 1 microgram into kilogram<br>ii) 100 decameter into cm​
Kobotan [32]

Answer:

1×10^-9kilogram

100 decameter =100000cm

3 0
3 years ago
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An archer pulls back the string of a bow to release an arrow at a target. Which kind of potential energy is transformed to cause
Ugo [173]
Elastic Potential Energy because the elasticity in the string stores up the energy.
3 0
4 years ago
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