Question

An electron is held 2.0 m above the ground and released. It
moves against gravity towards a charged sphere with Q= 3.0 x
10^{-19}C which is held 6.0m directly above the electron's
starting point. Determine the speed of the electron when it id 1.0
m from the sphere.

Answer #1

An electron is held 18.0 m above the ground. How far apart would
two different electrons need to be held in order to have the same
potential energy as the first electron?
What is the potential 5.3 mm away from a 1.6 μC point charge? a.
What distance from a 15 nC charge would have the same
potential?

An object of mass 120 kg is released from rest 480000 m above
the ground and allowed to fall under the influence of gravity.
Assume the gravitational force is constant, with g=9.8
m/sec2 , and the force due to air resistance is
proportional to the velocity of the object with proportionality
constant k= 3 kg/sec. Approximate the speed (in m/sec) of the
object when it strikes the ground.

A tennis player hits a ball 2.0 m above the ground. The ball
leaves his racquet with a speed of 20 m/s at an angle 5.0 ∘ above
the horizontal. The horizontal distance to the net is 7.0 m, and
the net is 1.0 m high. Does the ball clear the net?
Thank you so much in advance!

An electron is initially at ground level, and the electric
potential at that point is assumed to be exactly 0. The electron is
immersed in a uniform electric field that points down with a
magnitude of 2.7x10^ -11 N/C as well as Earth's graviational field
(9.8 N/kg pointing down). Only gravity and the electric force are
relevant.
a) If the electron is given an initial upward speed of 30 m/s,
what is the maximum height above the ground that it...

a block of mass m=2.0 kg, initially at h=1.5 m, is released with
an initial speed of 10 m/s and slides along a track. the track is
frictionless except from point A to point B, where the length L is
3.0 m and the coefficient of kinetic friction is Uk= 0.3. Note: The
block can be treated as a point object. the gravitational energy
potential energy on the ground level is taken to be zero
1. what is the intial...

a) An electron has a velocity of 7.0 x 106 m/s in the
positive x direction at a point where the magnetic field has the
components Bx = 3.0 T, By = 2.5 T, and Bz =
2.0 T. What is the magnitude of the acceleration of the electron at
this point (in 1018 m/s2)? (me = 9.11 x
10-31 kg, e = 1.6 x 10-19 C)
b) A particle (q = 5.0 nC, m = 3.0 μg) moves in...

During warm ups, a tennis player hits a ball which is 2.0 m
above the ground. The ball leaves his racquet with a speed of 16.0
m/s at an angle 4.8 ∘above the horizontal. The horizontal distance
to the net is 7.0 m, and the net is 1.0 m high. Assume that the
path of the ball, as observed from a bird's eye view, is parallel
to the long lines of the tennis court.
A) At what time, after being...

21) A person carries a 25.0-N rock through the path shown in the
figure, starting at point A and ending at point B. The total time
from A to B is 1.50 min. How much work did gravity do on the rock
between A and B?
A) 625 J
B) 20.0 J
C) 275 J
D) 75 J
E) 0 J
22) A person carries a 2.00-N pebble through the path shown in
the figure, starting at point A and...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

do all five questions
Question 1
20 pts
Ignoring the effects of air resistance, if a ball falls freely
toward the ground, its total mechanical energy
Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
20 pts
A child jumps off a wall from an initial height of 16.4 m and lands
on a trampoline. Before the child springs back up into the air the
trampoline compresses 1.8 meters. The spring constant...

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