Question

An 1kg aluminum block (p=2.7 g/cm^3) is dropped into a freshwater lake (p=1.0g/cm^3) and it quickly reaches terminal velocity at which point it continues to sink at a constant speed of 2.0 m/s.

Answer #1

A 100 g block attached to a spring with spring constant 2.7 N/m
oscillates horizontally on a frictionless table. Its velocity is 22
cm/s when x0 = -5.6 cm . What is the amplitude of oscillation? What
is the block's maximum acceleration? What is the block's position
when the acceleration is maximum? What is the speed of the block
when x1 = 2.9 cm ?

A 350-g block is dropped onto a vertical spring with spring
constant k =110.0 N/m. The block becomes attached to the spring,
and the spring compresses 50.6 cm before momentarily stopping. The
speed just before the block hits the spring is 8.4 m/s. The work
done by the spring force is -14.1J. The work done by weight is 1.74
J. If the speed at impact is doubled, what is the maximum
compression of the spring

A flower falls to the bottom of a lake. Once it is on the
bottom, it will release pollen (a little sphere) which begins to
float towards the surface The drag force on a sphere in fluid is
Fdrag=6πrηv,
where r=100 μm is the radius of the pollen,
η=10^−3 Ns/m^2 is the viscosity of water and v is the
velocity of the pollen. The density of pollen is
p=300kg/m^3 and the density of water is
ρw=1000kg/m3. The pollen floats due...

1. A loaded gun is dropped on a frozen lake. The gun fires, with
the bullet going horizontally in one direction and the gun sliding
on the ice in the other direction. The bullet's mass is 0.04 kg,
and its speed is 305 m/s. If the gun's mass is 1.8 kg, what is its
speed (in m/s)?
______m/s
2. A 37 kg child uses a pogo stick to bounce up and down. The
spring constant, k, of the toy equals...

What did I do wrong?
1) A 44.3 g piece of Aluminum is dropped into a beaker
with 88.2 ml of water. The temperature of the water warms from 35.1
degrees Celsius to 53.7. What quantity of heat energy did the piece
of aluminum give off? Specific heat of water = 4.18 J/g*K, the
density of water is 1.00 g/mL.
I calculated Delta T (18.6) .... Then added mass of water and
mass of aluminum (=132.5g).... and q = 4.18...

A small wooden sphere of density .7 g/cm^3 is attached to the
end of a string of length 2.0 m in a large tank of water. The other
end of the string is attached to the bottom of the tank, forming a
reverse pendulum. The tank is in a train moving along a circular
path of radius 200 m at a constant speed of 30 m/s. Ignore water
friction. The period of small oscillations of the pendulum is
closest to:...

2. A 100 cm rod is free to pivot about one end, and a 50 N force
is applied at the other end at an angle 20 degree to the
horizontal.
(i) Calculate the lever arm of the rod.
(ii) Calculate the torque about the pivot point.
3. Joe weighing 500 N sits 0.5 m to the left of center of the
seesaw 2 m long. Liz sits at the end on the opposite side of a
seesaw of mass...

1.A horizontally suspended 3.0 m track for fluorescent lights is
held in place by two vertical beams that are connected to the
ceiling. The track and lights jointly weigh 40 N. One beam is
attached 20 cm from one end of the track and the other beam is
attached 50 cm from the opposite and of track. What upward force
does each beam apply to the track?
2.Three 5.0 kg spheres are distributed as follows. Sphere A is
located at...

Question 1 (1 point)
Which is not necessary in order to do work on an object (use the
scientific definition of work)?
Question 1 options:
There must be a change in momentum.
A net force must be applied to the object.
The object must undergo a displacement.
A component of the force must be in the direction of motion.
Question 2 (1 point)
The change in gravitational potential energy for a 1.9 kg box
lifted 2.2 m is:
Question 2...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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