Saturday

May 23, 2015

May 23, 2015

**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 at 2:34pm*

**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 at 2:29pm*

**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 at 1:59pm*

**Physics**

62m of skid marks and coefficient of .75, how fast was the car going?
*Sunday, February 22, 2015 at 1:58pm*

**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 at 8:43am*

**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 at 8:35am*

**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 at 5:19am*

**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 at 3:29am*

**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 at 3:26am*

**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 at 9:22pm*

**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 at 8:15pm*

**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 at 6:26pm*

**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 at 5:35pm*

**physics**

state coulombs law
*Saturday, February 21, 2015 at 2:35pm*

**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 at 2:28pm*

**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 at 2:23pm*

**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 at 1:21pm*

**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 at 11:50am*

**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 at 10:33am*

**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 at 10:16am*

**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 at 10:10am*

**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 at 8:02am*

**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 at 8:01am*

**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 at 8:00am*

**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 at 5:24am*

**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 at 5:21am*

**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 at 3:16am*

**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 at 11:34pm*

**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 at 9:48pm*

**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 at 9:46pm*

**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 at 8:23pm*

**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 at 5:14pm*

**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 at 4:43pm*

**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 at 3:51pm*

**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 at 1:21pm*

**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 at 1:16pm*

**Physics**

What is the wavelength of visible light emit- ted at 4.2 × 108 MHz?
*Friday, February 20, 2015 at 12:31pm*

**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 at 11:16am*

**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 at 10:50am*

**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 at 10:33am*

**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 at 10:33am*

**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 at 9:56am*

**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 at 8:03am*

**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 at 5:29am*

**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 at 3:00am*

**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 at 12:57am*

**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 at 12:51am*

**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 at 12:13am*

**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 at 12:09am*

**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 at 12:02am*

**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 at 12:01am*

**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 at 12:01am*

**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 at 12:01am*

**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 at 11:06pm*

**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 at 9:08pm*

** 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 at 9:01pm*

**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 at 8:37pm*

**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 at 8:33pm*

**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 at 8:10pm*

**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 at 7:52pm*

**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 at 7:30pm*

**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 at 7:07pm*

**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 at 6:58pm*

**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 at 6:56pm*

**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 at 6:54pm*

**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 at 5:08pm*

**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 at 2:54pm*

**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 at 1:18pm*

**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 at 1:02pm*

**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 at 8:57am*

**Physics**

Hi, just need a little help with this physics question please. A cylindrical tank of water is located 68m deep in water. An air lock at the bottome of the tank allows access. The sailor must wait while the air pressure in the lock is increased until it equals the water ...
*Thursday, February 19, 2015 at 4:56am*

**physics**

1.A 910 kg racecar starts from rest and reaches a speed of 25.1 m/s in 0.48 s. a)What is the average acceleration of the racecar during this time period? b)What is the magnitude of the net force on the racecar? for a) I know: Mass= 910kg V=25.1m/s T=0.48s and I know to find A...
*Thursday, February 19, 2015 at 2:27am*

**physics**

The water storage tank has a diameter of 0.5m and contains 150L of water. You find a small hole rusted in the base, with a diameter of 10mm. what is the velocity of the water flowing out of the hole? So, i feel like I need to somehow use both Bernoullis equation and continuity...
*Thursday, February 19, 2015 at 2:26am*

**physics**

The equation given is 2SO2(g)+O2(g)->2SO3(g), and if 224L/h of O2 (at standard temp and pressure) is consumed by the reaction, how much power is produced? I can't go further than P=Work/Time and Work=P times change in V I've tried 224x2-224x3/60^2 but that's not...
*Thursday, February 19, 2015 at 2:10am*

**physics**

a ball tossed upward at an initial angle has an initial vertical velocity of 20 m/s and horizontal velocity component at 2m/s. the allocation of the ball is shown at 1 second .sketch the diagram of the motion
*Thursday, February 19, 2015 at 2:02am*

**College Physics**

A lab class conducts a 1000 trial scattering probability experiment. Nine (9) target marbles were used on a 45.0 cm wide board. The marble diameter was calculated to be 1.48 cm. How many hits were recorded during the experiment? If the standard value for the marble diameter is...
*Thursday, February 19, 2015 at 1:04am*

**physics**

A lab class conducts a 1000 trial scattering probability experiment. Nine (9) target marbles were used on a 45.0 cm wide board. The marble diameter was calculated to be 1.48 cm. How many hits were recorded during the experiment? If the standard value for the marble diameter is...
*Thursday, February 19, 2015 at 12:59am*

**physics**

The engine of a racing car of mass m delivers a constant power P at full throttle. Assuming that the friction drag force on the car is proportional to the velocity: Fdrag = -cv where c is a positive constant.What maximum speed can be attained by the car on level ground?
*Thursday, February 19, 2015 at 12:31am*

**physics**

The engine of a racing car of mass m delivers a constant power P at full throttle. Assuming that the friction drag force on the car is proportional to the velocity: Fdrag = -cv where c is a positive constant.What maximum speed can be attained by the car on level ground?
*Thursday, February 19, 2015 at 12:27am*

**physics**

A football is thrown with an initial upward velocity component of 13.5m/s and a horizontal velocity component of 16.5m/s How much time is required for the football to reach the highest point in its trajectory? How high does it get above the ground?How much time after it is ...
*Wednesday, February 18, 2015 at 9:03pm*

**Physics**

A man is on his apartment balcony 25m above ground level. He has a fire hose aimed directly at another man who is a ground level, a horizontal distance of 35m from the apartment block. The man on the balcony opens the nozzle and water travels with a speed of 18m/s. how far ...
*Wednesday, February 18, 2015 at 7:47pm*

**Physics**

Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands four times as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height ...
*Wednesday, February 18, 2015 at 7:14pm*

**Physics**

You are given two transverse waves on a string: f1(x) and f2(x) moving toward each other. At an initial time, the wave f1(x) (lying between 0 and 5 m) moves to the right at v1 = +1 m/s and f2(x) (lying between 5 and 10 m) is moving to the left at v2 = −1 m/s.
*Wednesday, February 18, 2015 at 4:45pm*

**physics**

Three identical charges (q =4.3 µC)lie along a circle of radius 1.9 m at angles of 30°, 150°, and 270°, as shown in the figure below. What is the electric field at the center of the circle? I THOUGHT IT WOULD BE ZERO BUT MY PROF TELLS ME THAT'S WRONG WHY?
*Wednesday, February 18, 2015 at 3:43pm*

**Physics**

Leroy, who has a mass of 72 kg, is skateboarding at 5.9 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.
*Wednesday, February 18, 2015 at 1:59pm*

**Physics**

Before going into orbit, an astronaut has a mass of 55 kg. After some days in orbit, a measurement determines that a force of 110 N causes her to move with an acceleration of 1.90 m/s2. What is her mass now?
*Wednesday, February 18, 2015 at 1:59pm*

**Physics**

When you jump vertically 0.86 meters above the ground, what is your acceleration when you reach your highest point?
*Wednesday, February 18, 2015 at 1:58pm*

**physics**

a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
*Wednesday, February 18, 2015 at 1:05pm*

**physics**

Paul lifts a sack weighing 245 newtons vertically from the ground and places it on a platform at a height of 0.7 meters. If he takes 10 seconds to do this task, what power has he expended during this time?
*Wednesday, February 18, 2015 at 12:19pm*

**physics**

A simple harmonic oscillator executes motion whose amplitude is .20 m and it completes 60 oscillations in 2 minutes Calculate its time period and angular frequency
*Wednesday, February 18, 2015 at 11:17am*

**physics**

3 blocks with masses of 1,00; 3,00 & 4,00 are connected with strings.calculate the acceleration of the blocks and the tension in the strings.
*Wednesday, February 18, 2015 at 10:45am*

**Calculus Physics**

A particles with mass 3.7 kg moves in the x direction according to the following function: x(t)=−7+4t+3t2−4t3. (the units of each coefficient are meters, and time is measured in seconds). At time t=7.8, what is the net force acting on the particle?
*Wednesday, February 18, 2015 at 10:45am*

**Calculus Physics**

A box and one force vector, F1 is shown. F1 = + 10 N. If the mass of the box is 3 kg, what is the magnitude and direction of a force, F2, that would need to be applied if the box was to have an acceleration of + 2 m/s 2 in the horizontal direction. (Indicate direction by ...
*Wednesday, February 18, 2015 at 9:23am*

**physics**

a small marble of negligible dimensions and of the mass 1.1kg is placed at a point A of a smooth frictionless circular
*Wednesday, February 18, 2015 at 7:25am*

**Physics**

A box slides down a 27.7° ramp with an acceleration of 1.25 m/s². The acceleration of gravity is 9.8 m/s². Determine the coefficient of kinetic friction between the box and the ramp.
*Wednesday, February 18, 2015 at 5:43am*

**Physics**

A child is twirling a 0.0120-kg plastic ball on a string in a horizontal circle whose radius is 0.100 m. The ball travels once around the circle in 0.500 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, does the centripetal force double...
*Wednesday, February 18, 2015 at 1:01am*

**Physics **

Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
*Wednesday, February 18, 2015 at 12:28am*

**physics**

A 7.00-kg bowling ball moves at 2.15 m/s. How fast must a 2.40-g Ping-Pong ball move so that the two balls have the same kinetic energy?
*Tuesday, February 17, 2015 at 11:12pm*

**physics**

A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic friction between the ...
*Tuesday, February 17, 2015 at 11:05pm*

**Physics **

Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
*Tuesday, February 17, 2015 at 10:29pm*