Question

Write the kinetic, potential and total energy of a baseball having a mass of 0.145kg held at rest 10 meters above the ground. The baseball is released. Under the influence of gravity on Earth, it freefalls to the ground. Assuming the air resistance is negligible, write the kinetic, potential and total energy of the baseball at the instant when the baseball hits the earth. What is the baseball’s final speed when it impacts the ground using the principles of Energy Conservation?d

Answer #1

A stone 0.44 kg mass is released from rest from a height of 29.4
m above the ground. Ignoring air resistance and letting the ground
be the zero potential energy level,
Determine the final kinetic energy of the stone using energy
conservation principle only, not as a free fall.
Determine the work done on the stone by gravity.

a 42.0 kg projectile is launched horizontally from the top of
a cliff, 50 meters above the ground. the projectiles initial speed
is 30 m/s.
use g=10m/s^2
A)What is the projectiles inti kinetic energy?
B)What is the projectiles total mechanical emergy the moment
is launch?
C)What is the projectiles initial gravitational potential
energy?
D)if air resistance and other forms of friction are
negligible, the projectile speed as it flies to the ground. As this
happens, the kinetic energy will ____________,...

A. Suppose a 10kg object as a total energy of 500J. If all of
this energy is kinetic energy, how fast is the object moving? (I
got 10 m/s) Is this correct?
B. Assume now that the same object has only gravitational
potential energy. If the object is on Earth, how high up is it? (I
got 5.1 m, is this correct?)
C. According to conservation of energy, the object must have the
same TOTAL energy (kinetic plus potential) at...

**Please do not write in handwriting**
1- Compare the values of kinetic, potential and total energy of
an oscillating mass-spring system in the following cases:
a) When the spring is the most compressed and the most
extended.
b) When the spring is nearly relaxed.
2- Suppose that a simple pendulum is calibrated to 2 cycles per
second at sea level and is then brought up to the top of a tall
mountain. What would need to be done to re-calibrate...

Two masses are connected by a massless string, passing over a
massless, frictionless pulley as shown in the diagram. Mass
m1 = 5 kg, and is released from rest at a
height h = 4 m above the table. Mass
m2 = 3 kg, and starts at rest on the table.
Ignore friction and air resistance. Take the system to be the two
masses and the earth. What is the potential energy of this system,
in Joules? Next, you let...

1. What is the weight of a 1.2kg mass on Earth?
2. How much potential energy is given to a 1.0kg mass when
raising it up 1.0 meters (on Earth)?
3. If a 1000kg car doubles its speed from 2m/s to 4m/s, by what
factor does its kinetic energy increase?
4.An athlete pushes a 2kg shot put with 20N of force during a
throw. How much does it accelerate?
please don't hand write the answers.

Modify your Free Fall program below to plot the energy vs. time
for a baseball dropped from a height of 1000 feet until it hits the
ground. Now add in the effects of air resistance into your program.
This time, on the energy plot, you will plot four quantities: KE
(Red line), PE (Green line), Energy lost due to air resistance
(purple line), and total Energy (blue circles). Note, you must
calculate the energy lost by using the definition of...

A horizontal block-spring system with the block on a
frictionless surface has total mechanical energy E = 39.0 J and a
maximum displacement from equilibrium of 0.260 m.
(a) What is the spring constant? ___N/m
(b) What is the kinetic energy of the system at the equilibrium
point? ___J
(c) If the maximum speed of the block is 3.45 m/s, what is its
mass? ___kg
(d) What is the speed of the block when its displacement is
0.160 m? ___m/s...

A horizontal block-spring system with the block on a
frictionless surface has total mechanical energy E = 54.5
J and a maximum displacement from equilibrium of 0.285 m.
(a) What is the spring constant?
N/m
(b) What is the kinetic energy of the system at the equilibrium
point?
J
(c) If the maximum speed of the block is 3.45 m/s, what is its
mass?
kg
(d) What is the speed of the block when its displacement is 0.160
m?
m/s...

A horizontal block–spring system with the block on a
frictionless surface has total mechanical energy E = 45 J and a
maximum displacement from equilibrium of 0.23 m.
(c) If the maximum speed of the block is 3.06 m/s, what is its
mass?
37.27 kg
61.19 kg
35.49 kg
17.75 kg
(d) What is the speed of the block when its displacement is 0.17
m?
(e) Find the kinetic energy of the block at x = 0.17 m.
(f) Find...

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