Your apparent weight is the force you feel on the bottoms of
your feet when you are standing. Due to the Earth's rotation, your
apparent weight is slightly more when you are at the South Pole
than when you are at the equator. What is the ratio of your
apparent weights at these two locations? Carry three significant
figures in your calculation.
In: Physics
Derive the formula for the magnetic field of a solenoid using Ampere’s
law. Be sure to draw a diagram showing the solenoid, magnetic field and Amperean loop.
Explain how you use the loop to compute the enclosed current and circulation of the B field.
(On which sides is the dot product of B and dl zero, and why?)
In: Physics
A charge of -3.40 nC is placed at the origin of an xy-coordinate system, and a charge of 1.60 nC is placed on the y axis at y = 4.50 cm .
a-If a third charge, of 5.00 nC , is now placed at the point x = 3.15 cm , y = 4.50 cm find the x and y components of the total force exerted on this charge by the other two charges. ?
b-Find the magnitude of this force.
c-Find the direction of this force.
In: Physics
The time of flight of a ball thrown horizontally change if the initial velocity change? If it does why?
In: Physics
A fountain sends water to a height of 150 meters. What is the difference between the pressure of the water system and the atmospheric pressure?
In: Physics
When two objects collide, the impulse each delivers to the other is equal and opposite. But each object might experience a different acceleration. Calculate the acceleration of two objects in a given collision.
• How can you tell the difference between elastic and inelastic collisions? How would I set the first question up? Is there a specific equation I need to use?
How would I set it up? Do I need to first find the velocities of each object and then use those to find the acceleration of each?
In: Physics
1. A skier of mass 80 kg starts from rest and slides down a frictionless slope of length 35 m that is
inclined at an angle of 30 degrees with the horizontal. Ignore air resistance.
a. Calculate the work done by gravity on the skier, and the work done by the normal force
on the skier.
b. If the slope is not frictionless so that the skier has a final velocity of 25 m/s, calculate the
work done by gravity, the work done by the normal force, the work done by friction, the
force of friction, and the coefficient of kinetic friction.
In: Physics
A 1000-kg car rounds a curve on a flat road of radius 50 m at a speed of 50 km/h (14 m/s). Will the car follow the curve, or will it skid? Assume (a) the pavement is dry and s = 0.60; (b) the pavement is icy and s = 0.25
In: Physics
Two spherical shells have a common center. A -1.00 ×
10-6 C charge is spread uniformly over the inner shell,
which has a radius of 0.050 m. A +4.00 × 10-6 C charge
is spread uniformly over the outer shell, which has a radius of
0.15 m. Find the magnitude and direction of the electric field at a
distance (measured from the common center) of
(a) 0.20 m,(b) 0.10
m,c) 0.025 m.
In: Physics
The coefficient of static friction between teflon and scrambled
eggs is about 0.04.
What is the smallest angle from the horizontal that will cause the
eggs to slide across the bottom of the Teflon-coated skiller?
In: Physics
A small rock moves in water, and the force on it by the water is given by f=kv. The terminal speed of the rock is measured and found to be 2.0m/s. The rock is projected upward at an inital speed of 6.0m/s. You can ignore the buoyancy force on the rock
a) in the absence of fluid resistance, how high will the rock rise and how long will it take to reach this maximum height? I managed this one. b) when the effects of fluidresistance are included, what are the answers to the question in part a).
i manage to get the same z time as the solution on this website.
I and the website has the same equation for Vy.
the websites solution for Y = Vt*[1-e^(-k/mt))] which is the same expression as the example in the book.
But in the example in the book there is no initial speed Vy=0. In the question there is initla speed and therefor I think the expression for Y must be different from the examples expression. Therefore I think the solution of this question on this website must be wrong. Please comment me on this.
In: Physics
The following objects are released simultaneously from rest at the top of a 1.35m long ramp inclined at 3.10 degrees to the horizontal: a solid sphere, a solid cylinder, a hollow cylindrical shell, and a hollow ball.
Which wins the race? The solid Sphere won, I just cant get the positions of the other 3 objects
At the moment the winner reaches the bottom, find the positions of the other three objects.
please explain....
In: Physics
A block of wood has a mass of 3.54 kg and a density of 588 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m3) so that it will float in water with 0.887 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the bottom of the wood?
In: Physics
Cavendish measured the gravitation constant G, but actually he measured that constant on the Earth. What
In: Physics
Show your work for the following, not just the final answer:
a) What is the SIL for a sound of intensity Ia=5.2
In: Physics