A ball is dropped from a building of height 100m. At the same
time, another ball is then thrown vertically up from the ground
with a velocity V_{0. }They meet each other at
the middle. What is the speed V_{0} of the ball thrown
vertically up?

a) 44.3m/s

b)9.8m/s

c) 31.3m/s

d)19.6 m/s

e) 98.0m/s

In: Physics

PLEASE DO 1 AND 2. Thank you !!

1. A test charge of +2.5 μC is placed halfway between a charge
of +6 μC and another of +4 μC separated by 13.4 cm. What is the
magnitude of the net force on the test charge?

2. Common transparent tape becomes charged when pulled from a
dispenser. If one piece is placed above another, the repulsive
force can be great enough to support the top piece's weight.
Assuming equal point charges (only an approximation), calculate the
magnitude of the charge if electrostatic force is great enough to
support the weight of a 5.52 milligrams piece of tape held 2.11 cm
above another.

In: Physics

*explain in 1 paragragh each*

1. Explain(1 paragragh) why plate area is directly related to
capacitance, plate charge, and energy.

2. Explain(1 paragragh) why seperation distance is inversely
related to capacitance, plate charge and stored energy.

3. Explain(1 paragragh) why each dielectric is different from
the rest.

4. What general mathematic word or phrase best describes the
differences?

In: Physics

A charge of 3.06 is held fixed at the origin. A second charge of 3.06 is released from rest at the position (1.11 m, 0.524 m). If the mass of the second charge is 2.73 g, what is its speed when it moves infinitely far from the origin? At what distance from the origin does the 3.06 charge attain half the speed it will have at infinity?

In: Physics

A
boy in a tree throws an apple upward with a speed of 8 m/s, how
long does the apple take to reach the ground , 5m below the boy?
How fast is the apple moving just before it strikes the
ground?

In: Physics

A 1.50 mol sample of an ideal gas with a molar specific heat of
*C*_{V} = 5/2 R always
starts at pressure 2.00 ✕ 10^{5} Pa and temperature 250 K.
For each of the following processes, determine the final pressure
(*P*_{f}, in kPa), the final volume
(*V*_{f}, in L), the final temperature
(*T*_{f}, in K), the change in internal
energy of the gas (Δ*E*_{int}, in J), the energy
added to the gas by heat (*Q*, in J), and the work done on
the gas (*W*, in J). (Due to the nature of this problem, do
not use rounded intermediate values in your calculations—including
answers submitted in WebAssign.)

(a) The gas is heated at constant pressure to 370 K.

*P*_{f} =_______ kPa

*V*_{f} =_______ L

*T*_{f} =_______ K

Δ*E*_{int}_______= J

*Q* =_______ J

*W* =_______ J

(b) The gas is heated at constant volume to 370 K.

*P*_{f} =_______ kPa

*V*_{f} =_______ L

*T*_{f} =_______ K

Δ*E*_{int}_______= J

*Q* =_______ J

*W* =_______ J

(c) The gas is compressed at constant temperature to 240 kPa.

*P*_{f} =_______ kPa

*V*_{f} =_______ L

*T*_{f} =_______ K

Δ*E*_{int}_______= J

*Q* =_______ J

*W* =_______ J

(d) The gas is compressed adiabatically to 240 kPa.

*P*_{f} =_______ kPa

*V*_{f} =_______ L

*T*_{f} =_______ K

Δ*E*_{int}_______= J

*Q* =_______ J

*W* =_______ J

In: Physics

A) A car travels at a constant speed of 32.5 mi/h (14.5 m/s) on
a level circular turn of radius 49.0 m, as shown in the bird's-eye
view in figure a. What minimum coefficient of static friction,
*μ*_{s}, between the tires and the roadway
will allow the car to make the circular turn without sliding?

B) At what maximum speed can a car negotiate a turn on a wet road with coefficient of static friction 0.215without sliding out of control? The radius of the turn is 25.5 m.

In: Physics

people wearing prism goggles, which shift the visual world left or right by small, quickly adapt to the distortion. suppose you were wearing goggles that completely reversed everything along the left-right dimension, as if you were viewing the world in a mirror, with objects to your right appearing to be on your left, and objects appearing to be on your left appearing to be on your right. would you be able to adapt to this sort of distortion? explain your answer.

In: Physics

1) a)Godzilla crushes a subway car between his two hands by pressing against its ends. The force applied at each end can be described as

options:

a tensile force

a compressive force

a shearing force

a bulk force

a and b

b) You place your flat hand on top of a textbook which is lying flat on the desk. You gently push against (along) the book cover in the direction parallel to the surface of the desk, causing the shape of the book to distort slightly. The parallel force you applied can be described as

options:

a tensile force

a compressive force

a shearing force

a bulk force

a and b

c) Two teams stretch a rope in a game of tug-of-war. The applied force from each of the two teams can be described as

options:

a tensile force

a compressive force

a shearing force

a bulk force

a and b

d) The units of Young's modulus, the shear modulus, and the bulk modulus are

options:

all N/m

all N/m2

all N/m3

N/m, N/m2, N/m3

all dimensionless

e) Stress divided by strain has units of

options:

Newtons

Newton meter

Newton per meter

Newton per square meter

none; it's dimensionless

In: Physics

In 2000, a gargantuan iceberg broke away from the Ross Ice
Sheet in Antarctica. It was approximately a rectangle with
dimensions 295km long, 37.0km wide, and 250.0m thick.

What is the mass of this iceberg, given that the density of
ice is 917kg/m3 ?

m=

How much heat transfer in joules is needed to melt the
iceberg?

Q=

How many years would it take sunlight alone to melt ice this
thick if the ice absorbs an average of 117W/m

2,12.0h per day?

t=

In: Physics

If the average drift speed of an electron is very slow, how can there by a current on the order of 1 or 2 ampere in a circuit if the drift speed is only about 1 meter per hour?

In: Physics

**9. A 60 kg football receiver starts from rest,
accelerating at a rate of 0.36 g’s for 1.42 seconds until he runs
as fast as he can. A ball of mass 0.25 kg is thrown, and the player
catches the ball 3.35 seconds after the play starts. If the ball is
travelling at 16 m/s when the player catches it, (a) how far down
field did the player catch it, (b) what will the player’s final
speed be after catching the ball, (c) what are the kinetic energies
of the ball and player separately before the catch, and (d) what is
the kinetic energy of the ball – player system after the catch? (e)
Compare your results of (c) and (d) and ex**plain.

In: Physics

To push a crate of mass **55 kg** up a frictionless
ramp with an angle of **50 °** to the horizontal, a
worker exerts a force of **1050 N** parallel to the
incline.

The crate moves a distance of **5 m**

What work is done on the crate by the worker?

J

Tries 0/2 |

What work is done by the weight of the crate?

J

Tries 0/2 |

What work is done by the normal force exerted by the floor on the
crate??

J

Tries 0/2 |

What is the total work done on the crate?

In: Physics

In a short essay ( 100 words ) answer the above the question.

In: Physics

An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 16.0 N. When completely submerged in water, its apparent weight is 13.4 N. What is the volume of the object? m3 The density of ethyl alcohol at zero degrees Celsius is 806 kg/m3.

In: Physics