Question

A 1.8 kg rock is released from rest at the surface of a pond 1.8 mm deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond.

**Part G**

Calculate the kinetic energy of the rock, KK, when the depth of the rock below the water's surface is 0.50 mm.

Express your answers using two significant figures.

**Part H**

Calculate the total mechanical energy of the system, EE, when the depth of the rock below the water's surface is 0.50 mm.

Express your answers using two significant figures.

**Part J**

Calculate the gravitational potential energy of the system, UU, when the depth of the rock below the water's surface is 1.0 mm.

Express your answers using two significant figures.

**Part K**

Calculate the kinetic energy of the rock, KK, when the depth of the rock below the water's surface is 1.0 mm.

Express your answers using two significant figures.

**Part L**

Calculate the total mechanical energy of the system, EE, when the depth of the rock below the water's surface is 1.0 mm.

Express your answers using two significant figures.

Answer #1

A 2.1 kg rock is released from rest at the surface of a pond 1.8
m deep. As the rock falls, a constant upward force of 4.9 N is
exerted on it by water resistance. Let y=0 be at the
bottom of the pond.
Part A
Calculate the nonconservative work, Wnc , done by water
resistance on the rock, the gravitational potential energy of the
system, U , the kinetic energy of the rock, K ,
and the total mechanical...

A 2.5 kg rock is released from rest at the surface of a pond 1.8
m deep. As the rock falls, a constant upward force of 4.4 N is
exerted on it by water resistance. Let y=0 be at the bottom of the
pond.
Part A
Calculate the nonconservative work, Wnc, done by water
resistance on the rock, the gravitational potential energy of the
system, U, the kinetic energy of the rock, K, and
the total mechanical energy of the...

A 2.5 kg rock is released from rest at the surface of a pond 1.8
m deep. As the rock falls, a constant upward force of 4.0 N is
exerted on it by water resistance. Let y=0 be at the bottom of the
pond. A.) Calculate the nonconservative work, Wnc, done by water
resistance on the rock, the gravitational potential energy of the
system, U, the kinetic energy of the rock, K, and the total
mechanical energy of the system,...

A pond with a total depth (ice + water) of 2.75 m is covered by
a transparent layer of ice, with a thickness of 0.32 m
Find the time required for light to travel vertically from the
surface of the ice to the bottom of the pond.
Express your answer using two significant figures.

An insect 0.80 mm tall is placed 1.0 mm beyond the focal point
of the objective lens of a compound microscope. The objective lens
has a focal length of 12 mm, the eyepiece has a focal length of 26
mm
Part A: Where is the image formed by the objective
lens? Give your answer as the distance from the image to the lens.
Express your answer in millimeters to two significant figures.
Part B: What is the magnification, including the correct...

a.) Calculate the gravitational potential energy of a 9.5-kg
mass on the surface of the Earth.
Express your answer using two significant figures.
b.) Calculate the gravitational potential energy of a 9.5-kg
mass at an altitude of 380 km.
Express your answer using two significant figures.
c.) Take the difference between the results for parts B and
A.
Express your answer using two significant figures.

Calculate the pH in 0.23 M HCO2H (Ka=1.8×10−4).
Express your answer using two decimal places.
pH =
2.20
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Up
Correct
Part B
Calculate the concentrations of all species present (HCO2H,
HCO−2, H3O+, and OH−) in 0.23M HCO2H .
Express your answers using two significant figures. Enter your
answers numerically separated by commas.
[HCO2H], [HCO−2], [H3O+],[OH−] =
M
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Part C
Also calculate the percent dissociation.
Express your answer using two significant figures.

At a rock concert, a dB meter registered 126 dB when placed 2.4
m in front of a loudspeaker on the stage.
Part A
What was the power output of the speaker, assuming uniform
spherical spreading of the sound and neglecting absorption in the
air?
Express your answer using two significant figures.
P =
W
Part B
How far away would the sound level be a somewhat reasonable 88
dB ?
Express your answers using two significant figures.

An equilibrium mixture contains N2O4,
(P= 0.28 atm ) and NO2 (P= 1.0 atm )
at 350 K. The volume of the container is doubled at constant
temperature.
Part A
Calculate the equilibrium pressure of N2O4
when the system reaches a new equilibrium.
Express your answer using two significant figures.
Part B
Calculate the equilibrium pressure of NO2 when the
system reaches a new equilibrium.
Express your answer using two significant figures.

An object has a total energy that is 2.8 times its rest
energy.
Part A
Part complete
What is its speed?
Express your answer using two significant figures.
v =
0.93
c
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Correct
Part B
What is the ratio of the object’s relativistic kinetic energy to
its rest energy?
Express your answer using two significant figures.

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