Monday

August 3, 2015

August 3, 2015

**Physics**

A 5.5 kg block is released from rest on a frictionless inclined plane making an angle of 23.3° with the horizontal. Calculate the time it will take this block when released from rest to travel a distance of 0.7 m along the ramp.
*Monday, February 23, 2015 by Anonymous*

**physics**

A ball which is at rest is dropped from a hight h meter as it bound off the flour its speed is 80% of what it was just before touching the ground the ball will rise nearly to rise of
*Monday, February 23, 2015 by faizi*

**physics**

Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
*Monday, February 23, 2015 by Guy M.*

**Physics**

The magnitude of the velocity of a projectile when it is at its maximum height above ground level is 12 m/s. (a) What is the magnitude of the velocity of the projectile 1.7 s before it achieves its maximum height? (b) What is the magnitude of the velocity of the projectile 1.7...
*Monday, February 23, 2015 by Ludvig*

**physics**

how much heat must be removed from 14 lbs of aluminum block in order to cool it from 80 degrees fahrenheit to 15 degrees fahrenheit?
*Monday, February 23, 2015 by asap*

**physics**

why we derive our hands upwards and backwards to catch the ball?
*Monday, February 23, 2015 by Haya Khan*

**Physics**

How to determine the work done on the object with a FCosTheta(Y axis)-Displacement(X axis) graph.
*Monday, February 23, 2015 by Jennifer*

**physics**

Stuck on solving for unknowns in part F and G help please? a) the upper loop 1 18I12+ 13I18=30 (b) the lower loop 2 =5.00I36 - 18I12= 24 (c) the node on the left side 3 I12+I36=I18 (d) Solve the node equation for I36. 4 I12 - I18 =I36 e) Using the equation found in (d), ...
*Monday, February 23, 2015 by MIKE*

**physics(waves)**

A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w = 340/3.5714 = 95.2m (Isn...
*Monday, February 23, 2015 by Francis *

**Physics**

A bead slides without friction around a loopthe-loop. The bead is released from a height of 18.9 m from the bottom of the looptheloop which has a radius 7 m. The acceleration of gravity is 9.8 m/s^2. What is its speed at point A ? Answer in units of m/s.
*Monday, February 23, 2015 by monica :)*

**physics**

A proton has an initial speed of 7·105 m/s. It is brought to rest by an electric field. a.) What is the magnitude of the voltage difference needed to bring this charge to rest? answer: 365.313*7v, WHY
*Sunday, February 22, 2015 by dan*

**Physics**

Your car is in a ditch. It requires 4500 N of force to get out of the ditch but you can only push with 750 N. What is the angle the rope needs to make, relative to straight across the road for you to be able to get the car out of the ditch? What is actually pulling the car out?
*Sunday, February 22, 2015 by John *

**physics**

You are skiing and have a mass of 47 kg and are on a slope making an angle of 37 degrees above horizontal. The coefficient of kinetic friction between the skis and the snow is 0.18. What is the amount of force pulling you down the slope? What is your acceleration down the slope?
*Sunday, February 22, 2015 by Anna*

**physics**

how do i figure the momentum of a 8.2 kg cannon ball moving at 9.3 m/s
*Sunday, February 22, 2015 by Anonymous*

**physics**

A 74-kg fisherman in a 129-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.7 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the velocity of the boat ...
*Sunday, February 22, 2015 by alba*

**Physics**

In class, we've been working on moment of inertia and recently did a lab regarding its usage. I don't feel too confident with the material yet and was hoping someone could look over my work and offer advice on what to do. We used solid spheres in the lab (2/5mr^2 used...
*Sunday, February 22, 2015 by Eva*

**physics**

In a popular amusement park ride, a rotating cylinder of radius R = 2.60 m is set in rotation at an angular speed of 4.00 rad/s, as in the figure shown below. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum ...
*Sunday, February 22, 2015 by alba*

**physics**

A satellite is in a circular orbit around the Earth at an altitude of 3.30 106 m. (a) Find the period of the orbit. (Hint: Modify Kepler's third law so it is suitable for objects orbiting the Earth rather than the Sun. The radius of the Earth is 6.38 106 m, and the mass of...
*Sunday, February 22, 2015 by alba*

**physics**

After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse to a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of the Earth. (a) Calculate the average density of the ...
*Sunday, February 22, 2015 by alba*

**physics**

A 3.42-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle. If the ball is in contact with the wall for 0.170 s, what is the average force exerted by the wall on ...
*Sunday, February 22, 2015 by alba*

**ap physics**

A force of magnitude Fx acting in the x-direction on a 2.55-kg particle varies in time as shown in the figure below. (Indicate the direction with the sign of your answer.) (a) Find the impulse of the force. (Give your answer to one decimal place.) kg · m/s (b) Find the ...
*Sunday, February 22, 2015 by alba*

**AP physics**

A 0.278-kg volleyball approaches a player horizontally with a speed of 16.2 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.4 m/s. (a) What impulse is delivered to the ball by the player? (Take the ...
*Sunday, February 22, 2015 by alba*

**physics**

friction between tires and pavement supplies the centripetal acceleration necessary for a car to turn. Using the coefficients of friction for rubber on concrete calculate the maximum speed at which a car can round a turn of radius 30 m (a) when the road is dry; (b) when the ...
*Sunday, February 22, 2015 by Marley*

**Physics**

This one has been confusing me, can someone walk me through it? I'd like to know which formulas I need to use and everything. A 121.0 -kg crate is sitting at rest on a ramp leading to the back of a truck. a) How many forces are acting on the crate while it is at rest? b) ...
*Sunday, February 22, 2015 by James*

**Physics**

Hey! I've tried using equations such as weight=m*g for this problem, but I don't think I'm doing it right. Can someone help? A helicopter was seen carrying a heavy bag of sand (1210.0 kg). A student figured that the acceleration of the sand bag then was 1.4 m/s2 in...
*Sunday, February 22, 2015 by James*

**Physics**

A 65.0 kg skier with an initial speed of 11.0 m/s coasts up a 2.50 m high rise as shown in Figure 6.23. Find his final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800.
*Sunday, February 22, 2015 by Andrew*

**physics**

Joel is walking down a street and sees a 115 ft tall building in front of him. He stops 190 feet from the base of the building at the tip of the building's shadow. Round answers to three decimal places.
*Sunday, February 22, 2015 by shay*

**Physics**

At an accident scene on a level road, investigators measure a car's skid mark to be 68 m long. It was a rainy day and the coefficient of friction was estimated to be 0.40. Using the work-energy theorem determine the speed of the car when the driver slammed on (and locked) ...
*Sunday, February 22, 2015 by Jennifer*

**Physics**

A rescue helicopter lifts a 70 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 9 m. What is the tension in the cable? How much work is done by the tension in the cable...
*Sunday, February 22, 2015 by Jennifer*

**physics/chemistry**

how does one calculate the work done by a spherical bubble with radius r in a liquid with a surface tension of T. I understand for a cavity it is 8pi(r)T, would you just double it to get 16pi(r)T because there are 2 films? here's the math....2(4pi((r)+dr)^2 -4pir^2) for a ...
*Sunday, February 22, 2015 by tom*

**Physics**

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If...
*Sunday, February 22, 2015 by Brad*

**physics -PLS HELP ASAP**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*Sunday, February 22, 2015 by EMILY*

**Physics**

The spring on a popgun obeys Hooke's law and requires a force of 220 N to compress it 12.0 cm to its!@#$%^&ed position. How much energy is stores in the!@#$%^&ed spring?
*Sunday, February 22, 2015 by Mary*

**Physics**

62m of skid marks and coefficient of .75, how fast was the car going?
*Sunday, February 22, 2015 by Mark*

**physics**

A ball dropped onto a floor from a height of 5m rises to a height of 2m after 3 bounces.What is the coefficient of restitution.? i know that e=(velocity of ball after 1st impact )/(velocity with which the ball strikes the floor).But will the no. of bounces effect the value of ...
*Sunday, February 22, 2015 by Anonymous*

**physics**

A 3.49 rad/s (33 rpm) record has a 5.99-kHz tone cut in the groove. If the groove is located 0.100 m from the center of the record, what is the "wavelength" in the groove?
*Sunday, February 22, 2015 by ciaran*

**College Physics**

where must a 500 N weight be hung on a uniform beam w/ a length of 5 m and weighs 150 N so that the girl standing on the other end is 1/4 as much as the boy standing at the other end?
*Sunday, February 22, 2015 by Anonymous*

**Physics Urgent!!**

a bungee jumper is falling at a velocity of 2m/s [down] when the bungee cord just starts to stretch. after the cord stretches for 2.5s, the velocity is 11m [down]. assume that the acceleration is at constant. a) what is the acceleration of the jumper? b) what is the total time...
*Sunday, February 22, 2015 by emily*

**physics**

A lead pellet is propelled vertically upward by an air rifle so that its initial speed is 49 m/sec. Find its total time of flight.
*Sunday, February 22, 2015 by samonte*

**Physics**

A 25.0 m tall hollow aluminum flagpole is equivalent in strength to a solid cylinder of aluminum 3.50 cm in diameter. A strong wind bends the pole much as a horizontal force of 900 N exerted at the top would. How far to the side does the top of the pole flex? I am almost 100% ...
*Saturday, February 21, 2015 by Jimmy*

**Physics**

A 70 kg person is having a tug-of-war. The rope is horizontal and 1.3 m above the ground. This person’s center of mass is 1.0 m from the ground when he is in an upright standing position. If the force his opponent exerts on the rope is 400 N, what angle must the person be...
*Saturday, February 21, 2015 by Rachel*

**physics**

A 3.9kg block moving at 2.0 m/s toward the west on a frictionless surface has an elastic head-on collision with a second 0.80kg block traveling east at 3.0 m/s. a)Determine the final velocity of first block. Assume due east direction is positive. b)Determine the final velocity...
*Saturday, February 21, 2015 by phys 220 *

**physics**

Estimate the change in gravitational potential energy when a person with mass 95kg rise from bed to a standing position. Assuming that the center of mass of a person is elevated by approximately Δh=0.50m.
*Saturday, February 21, 2015 by phys 220 *

**physics**

state coulombs law
*Saturday, February 21, 2015 by abdi*

**physics **

Two arrows are fired horizontally with the same speed of 31.8 m/s. Each arrow has a mass of 0.149 kg. One is fired due east and the other due south. Find the magnitude of the total momentum of the two arrow system in kg-m/s. (Hint: How do you combine vector arrows at right ...
*Saturday, February 21, 2015 by Hannah*

**physics**

A shuffleboard disk is accelerated at a 9.7m/s^2 from rest to a speed of 6.0m/s. What distance does the disk travel?
*Saturday, February 21, 2015 by Anonymous*

**ap physics**

A 0.461 kg mass is attached to a spring and executes simple harmonic motion with a pe- riod of 0.59 s. The total energy of the system is 2.4 J. Find the force constant of the spring
*Saturday, February 21, 2015 by arabelle*

**physics**

A bicycle has wheels with a diameter of 0.570 m. It accelerates uniformly and the rate of rotation of its wheels increases from 181 rpm to 260 rpm in a time of 19.9 s. Find the linear acceleration of the bicycle. i tried converting everything to linear to use a linear equation...
*Saturday, February 21, 2015 by tessa*

**Physics**

Three capacitors (3.83, 5.89, and 12.9 μF) are connected in series across a 58.0 V battery. Calculate the voltage across the 3.83 μF capacitor.
*Saturday, February 21, 2015 by Anonymous*

**College Physics**

A 3.0 m long light board with negligible weight is supported at each end by cables. a painter weighing 900 N stands 1.o m from the left cable. Find the tension in each cable.
*Saturday, February 21, 2015 by Anonymous*

**college physics**

a 3m long light board with negligible weight is supported at each end by cables. a painter weighing 900 N stands 1m from the left cable. find the tension in each cable,
*Saturday, February 21, 2015 by Anonymous*

**Physics**

The same voltage is applied between the plates of two different capacitors. When used with capacitor A, this voltage causes the capacitor to store 17 μC of charge and 5.7 x 10^-5 J of energy. When used with capacitor B, which has a capacitance of 6.9 μF, this voltage...
*Saturday, February 21, 2015 by e*

**Physics**

Two identical capacitors store different amounts of energy: capacitor A stores 2.5 x 10^-3 J, and capacitor B stores 4.8 x 10^-4 J. The voltage across the plates of capacitor B is 12 V. Find the voltage across the plates of capacitor A.
*Saturday, February 21, 2015 by e*

**Physics**

What is the capacitance of a capacitor that stores 5.2 μC of charge on its plates when a voltage of 4.8 V is applied between them?
*Saturday, February 21, 2015 by e*

**Physics**

A certain force gives mass m1 an acceleration of 13.0 m/s2 and mass m2 an acceleration of 3.6 m/s2. 1) What acceleration would the force give to an object with a mass of (m2-m1)? 2) A certain force gives mass m1 an acceleration of 13.0 m/s2 and mass m2 an acceleration of 3.6 m...
*Saturday, February 21, 2015 by Jordan*

**Physics**

A 5.0- kg concrete block rests on a level table. A 3.7- kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1.0 m/s2, what is the coefficient of friction between the block and the table?
*Saturday, February 21, 2015 by Jordan*

**physics**

A ball is thrown straight up from the ground at 10m/s, and simultaneously a ball is thrown straight down a 10m-high ledge at 10m/s. At what height do the two balls pass?
*Saturday, February 21, 2015 by vera*

**physics**

If a person weighs 700N on Earth, what force due to gravity would they exert on a 1500kg car they are standing 1.5m from? Assume the distance is between their centres of mass. F=Gm1xm2/r^2?
*Friday, February 20, 2015 by Emma *

**Physics**

on a perfect fall day you are hovering at rest at low altitude in a hot air balloon the total weight of the balloon including its load and the hot air in it is 15,000N find the volume of the displaced air I have no Idea how to go about this
*Friday, February 20, 2015 by Katheryn Boudreaux *

**Physics**

Three capacitors (3.83, 5.89, and 12.9 μF) are connected in series across a 58.0 V battery. Calculate the voltage across the 3.83 μF capacitor.
*Friday, February 20, 2015 by Anonymous*

**Physics**

1. Give 3 reasons why it is important to know the nature and properties of waves. 2. Aside from crossing the street, identify one scenario in practicing road safety and explain how it is realted to Doppler Effect.
*Friday, February 20, 2015 by Annika*

**physics**

At the local grocery store, you push a 14.0-kg shopping cart. You stop for a moment to add a bag of dog food to your cart. With a force of 12.0N, you now accelerate the cart from rest through a distance of 2.30m in 2.55s. What was the mass of the dog food?
*Friday, February 20, 2015 by Barbara*

**Physics**

A Ferris wheel 26.0m in diameter rotates once every 19.0s What is the ratio of a person's apparent weight to her real weight at the top and at the bottom? Please help! I know there are other questions similar to this but none of the answers are helping me, they are too ...
*Friday, February 20, 2015 by Maggie*

**Physics**

A 76.6-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.94 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.15 m/s2? I've ...
*Friday, February 20, 2015 by Kaleem*

**Physics**

A 3.7kg block moving at 2.0 m/s toward the west on a frictionless surface has an elastic head-on collision with a second 0.80kg block traveling east at 3.0 m/s.
*Friday, February 20, 2015 by Derp*

**physics 2**

to increse intensity o f a wave by a factor of 50, by what factor should the amplitude be increased?
*Friday, February 20, 2015 by mason*

**Physics**

What is the wavelength of visible light emit- ted at 4.2 × 108 MHz?
*Friday, February 20, 2015 by Chris *

**physics**

The magnetic field of the Earth is 0.50 x 10-4 T in a certain location. a) What will be in Newtons the force on a completely ionized carbon atom (Z = 6, A = 12) traveling with the solar wind with a velocity of 18.00 x 103 m/s perpendicular to the magnetic field? b) How fast ...
*Friday, February 20, 2015 by Trisha*

**physics**

A steel ball with a mass of 0.65 kg is swinging in a circle with a radius of 1.3 meters at a speed of 17m/s. What is the centripetal force?
*Friday, February 20, 2015 by Damon*

**Physics**

A baseball is thrown horizontally from a height of 3.6 meters at a speed of 24 m/sec. How far will it travel along the ground?
*Friday, February 20, 2015 by Damon*

**physics**

A square bar with a mass of 0.830 kg and 19.3cm long (l) rests on two parallel horizontal rails that are 18.0cm apart (d) and 120.0cm long (L) as shown in the figure. (By horizontal it is meant that the rails lie in a plane perpendicular to the local gravitational field.) The ...
*Friday, February 20, 2015 by Trisha*

**physics**

Consider a mass spectrometer like the one shown in the figure. A beam of singly charged positive ions is accelerated from an ion source and injected into a velocity selector with an electric field of E=2700V/m) and magnetic field of B=43.0mT. The ions then enter the deflection...
*Friday, February 20, 2015 by Amanda*

**physics**

An electron is accelerated from rest through 2310V and then enters a region where there is a uniform 1.59-T magnetic field. What is the maximum force on the electron? Answer in units of Newtons.
*Friday, February 20, 2015 by Amanda*

**physics**

A stone projected at angle alpha with plane inclined at angle theta find relation between alpha and theta if stone hit at right angke with the inclined plane?
*Friday, February 20, 2015 by vaib*

**physics**

A 25,000 kg rocket ship near the surface of the Earth accelerates upwards due to a constant 1.25 MN of thrust from its engine. A simple pendulum on the ship is observed to complete 100 full swings in 75.0 s. What is the length of the string? 1. For a simple pendulum: T = 2&#...
*Friday, February 20, 2015 by Anonymous*

**physics**

A bridge of length 22 m and mass 1.5 × 105 kg is supported at each end . A truck of mass 25000 kg is located 17 m from the left support A. Calculate the normal force on the bridge at point B (the right support). The acceleration of gravity is 9.8 m/s 2 .
*Friday, February 20, 2015 by marck*

**PHYSICS**

A hypothetical planet has a mass 1.55 times that of Earth, but the same radius. What is g near its surface?
*Friday, February 20, 2015 by Natalie*

**physics**

Problem: A long cylinder of diameter 2a has a charge per unit length, lambda, that is uniformly distributed down a very long wire. The cross section of the cylinder is not uniform, with a small hole drilled into it, which has a center at r = R and a diameter of 2b. Find an ...
*Friday, February 20, 2015 by Cory *

**physics**

Problem:A long cylinder of diameter 2a has a charge per unit length, lambda, that is uniformly distributed down a very long wire. The cross section of the cylinder is not uniform, with a small hole drilled into it, which has a center at r = R and a diameter of 2b. Find an ...
*Friday, February 20, 2015 by Cory *

**Physics Circular Motion**

A swing ride at a carnival consists of chairs that are swung in a circle by 13.5-m cables attached to a vertical rotating pole. Suppose the total mass of a chair and its occupant is 170 kg, the angle θ = 53° with the vertical pole. Find the speed of the chair.
*Friday, February 20, 2015 by Jayesh*

**Physics Circular Motion**

A 1400 kg car rounds a curve of radius 66 m banked at an angle of 12°. What is the magnitude of the friction force required for the car to travel at 80 km/h?
*Friday, February 20, 2015 by Jayesh*

**Physics Circular Motion**

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 7.0 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 2.7 m from ...
*Friday, February 20, 2015 by Jayesh*

**Physics Circular Motion**

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius (r). A passenger feels the seat of the car pushing upward on her with a force equal to two and a half times her weight as she goes through the dip. If r = 24.0 m, how fast is the ...
*Friday, February 20, 2015 by Jayesh*

**physics**

Two horizontal forces, and , are acting on a box, but only is shown in the drawing. can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that = +8.3 N and the mass of the box is 4.5 kg...
*Thursday, February 19, 2015 by bill*

**physics **

You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 20000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 1.88 m and the cannon is aimed at a 44◦ angle from the ground. ...
*Thursday, February 19, 2015 by Anonymous*

** physics**

what would the pressure be if box was turned so the smallest surface was touching ground. Box dimensions: length 25cm, width 10cm, height 4cm, mass 4kg
*Thursday, February 19, 2015 by Fran*

**Physics**

A truck runs into a pile of sand, moving 1.6m as it slows to a stop. The magnitude of the work that the sand does on the truck is 6.0×105J. What is its average force that the sand exerts on the truck?
*Thursday, February 19, 2015 by Derp*

**Calculus Physics**

A 1559-kg car moves at 15.0 m/s. What is the magnitude of the horizontal net force needed to bring the car to a halt in a distance of 50.0 m?
*Thursday, February 19, 2015 by danny*

**Physics**

A wheel 32.6 cm in diameter accelerates uniformly from 247 rpm to 378 rpm in 6.54 s. How far will a point on the edge of the wheel have traveled in this time
*Thursday, February 19, 2015 by Anonymous*

**Physics**

A projectile on level ground is launched with a certain speed vi and has a downrange distance of vx what is its new downrange distance if it is launched with a speed of 4vi instead?
*Thursday, February 19, 2015 by Dan*

**physics**

You begin pushing the car forward from rest. Assume that your car has a mass of 809 kg. Neglecting friction, how long will it take you to push your car up to a speed of 3.93 m/s on a level surface if you exert a constant force of 218 N on it?
*Thursday, February 19, 2015 by Anonymous*

**physics**

hen a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery. I know that emf is equal to current ...
*Thursday, February 19, 2015 by Chuck*

**Calculus Physics**

A particle is subject to a time-dependent force: F(t)=5t√. If the particle's mass is 7 kg, what will its velocity be at t=6.7 seconds, assuming its initial velocity at t=0 is equal to 0.
*Thursday, February 19, 2015 by danny*

**physics**

when a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the battery.
*Thursday, February 19, 2015 by Chuck*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...
*Thursday, February 19, 2015 by Sam*

**physics**

A block of wood with a mass of 1300g is sitting on a horizontal tabletop. The coefficient of kinetic friction between the block and table is µk=0.74.A rifle bullet with a mass of 39g is fired horizontally into the block at a sped of 290m/s and stops inside the block. a-...
*Thursday, February 19, 2015 by aaron*

**PHYSICS Electricity**

A carbon atom's nucleus and its electrons become separated by 20nm . How much work does it take to separate them in J?I found the magnitude of the force the nucleus feels from the electrons,2.07*10^-11 N but the work? Could ex[lain me please?
*Thursday, February 19, 2015 by Maurice*

**physics **

The magnetic field of the Earth is 0.60 x 10-4 T in a certain location. a) What will be in Newtons the force on a completely ionized carbon atom (Z = 6, A = 12) traveling with the solar wind with a velocity of 10.50 x 103 m/s perpendicular to the magnetic field? b) How fast ...
*Thursday, February 19, 2015 by Annie*

**Physics**

I'm trying to solve a Physics problem. I already got the answer correct but I'm unable to do the uncertainties. Can someone please explain how to do in this case? These are the variables used. g = 9.802 m/s2 +/- 0.0005 m/s2 m2 = 951.0 g +/- 2.3 g θ = 31.90º...
*Thursday, February 19, 2015 by Doubtful*

**physics**

a projectile is thrown from the ground with an initial velocity of 20.0m/s at an angle of 40 degrees above the horizontal, find the maximum height,the time required to reach its maximum height,c) it velocity at the top of the trajectory.d) the range of the projectile,e) the ...
*Thursday, February 19, 2015 by daniel*