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3 years ago

99 POINTS!!!!

1 answer:

3 0

The situation given above can be answered through the concept of the First Law of thermodynamics which states that the change in internal energy is equal to the difference between the work done and the heat added to the system. The work done by the object is negative and the heat added is positive.
change in internal energy = -500J + 1400 J = 900 J

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A mass of 148g stretches a spring 6cm. The mass is set in motion from its equlibrium position with a downward velocity of 10cm/s

zalisa [80]

Answer:

$u(t)=0.78sin12.78t$

Explanation:

We are given that

Mass,m=148 g

Length,L=6 cm

Velocity,u'(0)=10 cm/s

We have to find the position u of the mass at any time t

We know that

$\omega_0=\sqrt{\frac{g}{L}}=\sqrt{\frac{980}{6}}=12.78 rad/s$

Where g= $980 cm/s^2$

$u(t)=Acos12.78 t+Bsin 12.78t$

u(0)=0

Substitute the value

$A=0$

$u'(t)=-12.78Asin12.78t+12.78 Bcos12.78 t$

Substitute u'(0)=10

$12.78B=10$

$B=\frac{10}{12.78}=0.78$

Substitute the values

$u(t)=0.78sin12.78t$

7 0

2 years ago

The SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals?

Marat540 [252]

1 hectopascal (hPa) is equivalent to 100 Pa

3 0

2 years ago

Read 2 more answers

Explain why a real image must be produced in a camera and how the object and the lens are positioned to produce a real image whi

PilotLPTM [1.2K]

This is best explained through the use of an optics diagram, this is a little too complicated to explain in a short answer, and as I can't draw an appropriate diagram in this answer, I will point you to this excellent resource which explains what you have asked very well!

Go onto the BBC website (you should have access to it even if you aren't in the UK) and paste this after the BBC url,

/bitesize/intermediate2/physics/waves_and_optics/image_formation_from_lens/revision/1/

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3 years ago

What is 7.4×10 to the second power

sleet_krkn [62]

The correct answer is 740

8 0

3 years ago

What is formed when sediment stick together

Taya2010 [7]

Think its either sedimentary rocks or metamorphic rocks.

5 0

2 years ago

﻿99 POINTS!!!!

99 POINTS!!!!