Monday

February 8, 2016
**physics**

In a shipping company distribution center, an open cart of mass 55.0 kg is rolling to the left at a speed of 5.30 m/s (see the figure (Figure 1) ). You can ignore friction between the cart and the floor. A 18.0 kg package slides down a chute that is inclined at 37 ∘ from...
*Saturday, November 7, 2015 by malakai*

**physics**

Alkaline batteries have the advantage of putting out constant voltage until very nearly the end of their life. How long will an alkaline battery rated at 1 A ⋅ h and 1.58 V keep a 1 W flashlight bulb burning?
*Saturday, November 7, 2015 by carolyn*

**Physics**

Lunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round trip time. The taken for the laser pulse to travel there and back again can be measured to 0.1 ns. What ...
*Saturday, November 7, 2015 by carolyn*

**physics**

A heart defibrillator passes 10.0 A through a patient’s torso for 5.00 ms in an attempt to restore normal beating. Find the temperature increase caused in the 8.00 kg of affected tissue if all the energy heats up the tissue with a specific heat capacity of 3000 J kg-1 K-1.
*Saturday, November 7, 2015 by carolyn*

**Physics**

The propeller blades of an airplane are 2.4 m long. The plane is getting ready for takeoff, and the propeller starts turning from rest at a constant angular acceleration. The propeller blades go through two revolutions between the fifth and the seventh second of the rotation. ...
*Saturday, November 7, 2015 by John*

**general physics question**

Whenever I read my science textbooks, they always say that "electrons were fired" or "stream of electrons were fired to the target" during an experiment my question is, how to they generate a stream of electrons to fire in a line?? sorry if this is a dumb ...
*Saturday, November 7, 2015 by Anonymous*

**physics**

A 22 kg child is riding a playground merry-go-round that makes 40 revolutions in 60 seconds. Determine the magnitude of force (in Newtons) necessary to make the child stay on the merry-go-round if she is 1.25m from its center.
*Saturday, November 7, 2015 by edson*

**physics**

the speed of train is reduced from 60km/h at the same time as it travel a distance of 450m if retardation is uniform find how much further it will travel approx befor coming rest?
*Saturday, November 7, 2015 by tarique*

**physics**

Two workers are sliding 330 kg crate across the floor. One worker pushes forward on the crate with a force of 410 N while the other pulls in the same direction with a force of 240 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...
*Friday, November 6, 2015 by yahya*

**Physics **

Which of the following summarizes Rutherford's model of the atom? a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the nucleus like planets move around the...
*Friday, November 6, 2015 by Sam*

**Physics**

A ship fires its guns with a speed of 400 m/s at an angle of 35 with the horizontal. a. Find the range and maximum altitude. b. If the ship hits a plane that was 12 km away, how high was the plane flying?
*Friday, November 6, 2015 by Anonymous*

**Physics**

A person kicks a rock off a cliff horizontally with a speed of 20.0 m/s. It takes 7.0 seconds to hit the ground, find: a. height of the cliff b. final vertical velocity c. horizontal range
*Friday, November 6, 2015 by Anonymous*

**physics**

A hungry bear weighs 700 N walks to a basket of candy that is located in end of a beam . The beam is uniform and weighs 200N , with a length of 6.0 m . The beam is supported by a cord forming an angle of 60 ° . The basket weighs 80 N. When the bear is within 1.2 m ...
*Friday, November 6, 2015 by ???*

**Physics **

How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
*Friday, November 6, 2015 by anonymous *

**Physics**

A 1-m-tall barrel is closed on top except for a thin pipe extending 6.0 m up from the top. When the barrel is filled with water up to the base of the pipe (1 m deep) the water pressure on the bottom of the barrel is 10 kPa. What is the pressure on the bottom when water is ...
*Friday, November 6, 2015 by Cynthia*

**Physics**

Mr.Notten throws an egg from the top of a school at an initial velocity of 20m/straight upward. The egg is launched 50 m above the ground, and the egg just misses the edge of the roof on its way down? what is maximum height? what is the maximum height of the egg? Determine the...
*Friday, November 6, 2015 by Anonymous*

**Physics**

A ball is thrown from the top of a building with an initial velocity of 30m/s straight upward, at an initial height of 50m above the ground. The ball just misses the edge of the roof on is way down and hits the ground. Determine: a) time needed for ball to reach max height. B)...
*Friday, November 6, 2015 by Anonymous*

**Physics**

Lily throws a ball at an angle of 53.13 degrees above the horizontal from a building that is 10m high. The ball has a speed of 12m/s, .6 seconds after she throws it. What was the initial speed of the ball? This is a vector problem and uses variables such as vx, vy, vyi, delta ...
*Friday, November 6, 2015 by Hasan*

**AP Physics**

A car traveling in a straight line has a velocity of 3.24 m/s at some instant. After 3.28 s, its velocity is 8.18 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2 .
*Friday, November 6, 2015 by JB*

**Physics**

A golf ball has a mass of 0.05 kg. It is initially at rest, but after being struck by a golf club it is given a speed of 30 m/s. The club and the ball are in contact for 2 ms (.002 seconds).
*Friday, November 6, 2015 by Bob*

**Physics**

Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a shallow bucket of water (see diagram at right). Determine her speed and her height after each second of fall. When t = 0 s: speed = 0 m/s and height = ...
*Friday, November 6, 2015 by Ryan*

**Physics**

Miss E. deWater, the former platform diver of the Ringling Brothers' Circus, dives from a 80.0-meter high platform into a shallow bucket of water (see diagram at right). Determine her speed and her height after each second of fall. When t = 0 s: speed = 0 m/s and height = ...
*Friday, November 6, 2015 by Ryan*

**physics**

A hungry bear weighs 700 N walks to a basket of candy that is located in end of a beam . The beam is uniform and weighs 200N , with a length of 6.0 m . The beam is supported by a cord forming an angle of 60 ° . The basket weighs 80 N. When the bear is within 1.2 m ...
*Thursday, November 5, 2015 by Sylar*

**physics **

A parallel beam of light enters a clear plastic bead 2.50cm in diameter and refractive index 1.44 .the point beyond the bead are these rays brought to focus is Plz answer this question
*Thursday, November 5, 2015 by saisree*

**physics **

A hollow cylinder, a solid cylinder, a hollow sphere, and a solid sphere roll down a ramp without slipping, starting from rest. The ramp is 0.25 m high. All the objects have radius 0.035. What are their final speeds? Please show what equation you used and what you plugged in...
*Thursday, November 5, 2015 by Caroline*

**Physics **

How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
*Thursday, November 5, 2015 by anonymous *

**physics**

Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point?
*Thursday, November 5, 2015 by Jack *

**physics **

So basically I got this question and it's baffling. Over a distance of 5m the speed of a bicycle increase's from 2ms to 5ms what I's the magnitude of acceleration?
*Thursday, November 5, 2015 by Jack *

**Physics**

2. Consider the ball example in the introduction when a ball is dropped from 3 meters. After the ball bounces, it raises to a height of 2 meters. The mass of the ball is 0.5 kg a. What is the speed of the ball right before the bounce? b. How much energy was converted into heat...
*Thursday, November 5, 2015 by Sarah*

**Physics**

A projectile is launched at an angle of 20.0 degrees above the horizontal with an initial speed of 88.1 m/s. The maximum height reached by the projectile will be ____ m.
*Thursday, November 5, 2015 by Emily*

**Physics**

Calculate the pressure exerted by 75 cms of vertical length of a water column in SI units. Options: A. 7390Pa. B. 7560Pa. C. 7250Pa. D. 7350Pa.
*Thursday, November 5, 2015 by G. Samuel Frank*

**Physics**

Calculate the amount of heat energy required to raise the temperature of 2g of mercury[specific heat capacity 0.12J g-10 C-1] from 10degree C to 30degree C? Options: A. 3.0J. B. 3.5J. C. 4.0J. D. 4.8J
*Thursday, November 5, 2015 by G. Samuel Frank*

**Physics**

The water from two buckets is mixed together. One bucket contains 5kg of water at 20 degrees Celsius and the other contains 1kg of water at 80 degrees Celsius. What is the final temperature of the mixture, assuming no heat is lost to the surroundings? A. 30 degrees Celsius B. ...
*Thursday, November 5, 2015 by Vincent*

**zca mpika**

physics A rectangular open tank 6.0m × 8.0m is filled with water to a depth of 8.0m if the atmospheric pressure 1.013×10^pa.find the pressure at the bottom of the tank and force exerted at the bottom assume that g=10N/kg?
*Thursday, November 5, 2015 by tendai*

**physics**

a term is related as at=bt2 + ct3 +d,if 'a' has dimension of power,find the dimention of 'b','c' and 'd'......'t' is the time
*Thursday, November 5, 2015 by anoushka*

**physics**

a body starts from resr and accerlerates at the rate of "a" for time t and retards at 'b' for time 2t. find the final and the max velocity
*Thursday, November 5, 2015 by anoushka*

**Physics**

A beam that weighs 10.0 N/m is 2.5m long. It is supported at point a point 0.78 m from one end.? Find the weight of the object that must be placed on the other end of the beam to balance it
*Wednesday, November 4, 2015 by Fin*

**Physics**

A knight sits on a castle wall during a siege.To while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 5.7 m/s. If he is 45 m above the catapult, what is the initial velocity of the boulders? The acceleration ...
*Wednesday, November 4, 2015 by Jacob*

**Physics**

A worker sits at one end of a 199-N uniform rod that is 2.80 m long. A weight of 120 N is placed at the other end of the rod. The rod is balanced when the pivot is 0.630 m from the worker. Calculate the weight of the worker
*Wednesday, November 4, 2015 by Meep*

**Physics**

A rock is launched off a table horizontally with a velocity of 10 m/s. If the table is 1.5 m above the floor, how long will it take for the projectile to hit the floor? What distance will the rock land in respect from the edge of the table? 2(1.5)/9.8=t^2. T=.553? What is the ...
*Wednesday, November 4, 2015 by Kate*

**Physics**

As a protest against the umpire’s calls, a base- ball pitcher throws a ball straight up into the air at a speed of 20 m/s. In the process, he moves his hand through a distance of 1.47 m. The acceleration of gravity is 9.8 m/s2 . If the ball has a mass of 0.18 kg, find ...
*Wednesday, November 4, 2015 by Brandon*

**Physics**

The tallest volcano in the solar system is the 29 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ball’s 29 km fall at a value of 4.4 m/s 2. (We ...
*Wednesday, November 4, 2015 by Jacob*

**Physics**

A car moves on a level horizontal road in a circle of radius 30.5 m. the coefficient of friction between the tires and the road is 0.5. The maximum speed with which the car can round this curve without slipping is:
*Wednesday, November 4, 2015 by Troi*

**Physics**

The propeller blades of an airplane are 2.4 m long. The plane is getting ready for takeoff, and the propeller starts turning from rest at a constant angular acceleration. The propeller blades go through two revolutions between the fifth and the seventh second of the rotation. ...
*Wednesday, November 4, 2015 by John*

**Physics**

An object falls from rest. While falling it changes its speed by 10 meters per second every second. Calculate how far it has fallen, in meters, after falling for 4 seconds. However, do not put the units in the box below.
*Wednesday, November 4, 2015 by Phil*

**Physics**

In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.608 m. At one point on this circle, the ball has an ...
*Wednesday, November 4, 2015 by Deven*

**physics **

A cat is chasing a mouse. The mouse runs in a straight line at a speed of 2.2 m/s. If the cat leaps off the floor at a 29° angle and a speed of 4.0 m/s, at what distance behind the mouse should the cat leap in order to land on the poor mouse?
*Wednesday, November 4, 2015 by aaron*

**Physics**

A stone is dropped from the top of a cliff and hits the round below with a speed of 50m/s. Assume that the acceleration due to gravity is 10m/s/s. Find it's mean speed, in m/s, during the fall. Do not include units when typing your answer into the box. Using the answer you...
*Wednesday, November 4, 2015 by Phil*

**Physics**

Two trucks that look the same collide. One was originally at rest. The trucks stick together and move off at more than half the original speed of the moving truck. What can you say about the contents of the two trucks?
*Wednesday, November 4, 2015 by M*

**Physics**

In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.608 m. At one point on this circle, the ball has an ...
*Wednesday, November 4, 2015 by Deven*

**Physics**

A bomber flies horizontally with a speed of 175 m/s relative to the ground. The altitude of the bomber is 4780 m and the terrain is level. Neglect the effects of air resistance. gravity is 9.8 m/s a) How far from the point vertically under the point of release does a bomb hit ...
*Wednesday, November 4, 2015 by Anonymous *

**AP-Physics**

which of the following pairs of graphs shows the distance traveled versus time and speed versus for an object uniformly accelerated from rest?
*Wednesday, November 4, 2015 by maya*

**Physics**

So this is the problem: A comet is in an elliptical orbit around our Sun. At its point of closest approach, it is moving at 6.3x10^4 m/s and is 4.2x10^10m away from the sun. When it is at the farthest distance, 7.5x10^12m away, how fast is it going? This is what I did K1+U1=K2...
*Wednesday, November 4, 2015 by Crystal*

**Physics**

Starting from rest at t = 0 s, a wheel undergoes a constant angular acceleration. When t = 1.6 s, the angular velocity of the wheel is 5.9 rad/s. The acceleration continues until t = 19 s, when the acceleration abruptly changes to 0 rad/s2. Through what angle does the wheel ...
*Wednesday, November 4, 2015 by Julia*

**Physics**

A car is initially travelling at 30m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. How far does the car travel while the brakes are ...
*Wednesday, November 4, 2015 by Phil*

**physics**

Two blocks with masses M1 = 8.0 kg and M2 = 5.4 kg are connected with a massless string over two massless and frictionless pulleys, as shown in the Figure. One end of the string is connected to M1 while the other end is fixed. What is the acceleration of mass M2?
*Wednesday, November 4, 2015 by Kevin*

**Physics**

A ball projected with an initial velocity u at an angle tita to the horizontal cover a horizontal range of 26m after 5sec. Cal. The value of u and tita? g=10ms-1
*Wednesday, November 4, 2015 by Jason*

**Physics**

A block of mass 35kg is on a flat floor with a static friction coefficient of 0.36 and a kinetic friction coefficient of 0.29. A person attempts to slide the box from rest in a forward direction . Find the maximum frictional force experienced and the acceleration of the box ...
*Wednesday, November 4, 2015 by Gabb*

**Physics**

A 8 kg block is set moving with an initial speed of 6 m/s on a rough horizontal surface. If the friction 12 12 N, approximately how far does the block travel before it stops?
*Wednesday, November 4, 2015 by Jose Luis*

**PHYSICS**

A piece of aluminum (bulk modulus 7.1 x 1010 N/m2) is placed in a vacuum chamber where the air pressure is 0.307 x 105 Pa. The vacuum pump is then turned on and the pressure is further reduced to zero. Determine the fractional change V/V0 in the volume of the aluminum.
*Wednesday, November 4, 2015 by Anonymous*

**PHYSICS**

A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.248 m on a side, is subjected to two shearing forces, each of magnitude F = 3.84 x 10 6 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.
*Wednesday, November 4, 2015 by Anonymous*

**Physics**

A 50 kg boy runs at a speed of 10 m/s and jumps onto a cart. The cart is initially at rest. The speed of the cart with the boy on it is 2.50 m/s. a)What is the initial momentum of the boy? b) What is the final momentum of the boy and the cart? c) What is the mass of the cart?
*Wednesday, November 4, 2015 by Jose Luis*

**PHYSICS**

A tow truck is pulling a car out of a ditch by means of a steel cable (Y = 2.0 x 1011 N/m2) that is 9.73 m long and has a radius of 0.550 cm. When the car just begins to move, the tension in the cable is 859 N. How much has the cable stretched?
*Wednesday, November 4, 2015 by Anonymous*

**Physics **

An airplane with a velocity of 50m/s comes in to land at the start of the runway and brakes at -5m/s. Will it be able to stop in time if the runway is 275m long? I'm not sure which formula to use since the ones I have used give me very small answers in comparison to the 275m
*Wednesday, November 4, 2015 by Masha*

**Physics**

A 0.010 kg bullet is fired into a 7 kg ballistic pendulum. The pendulum rises 0.08m before it stops. Use conservation of energy and momentum to find the initial velocity of the bullet.
*Wednesday, November 4, 2015 by Jose Luis*

**PHYSICS**

A block weighs 15 N and is suspended from a spring that is attached to the ceiling. The spring stretches by 0.075 m from its unstrained length. By how much does the spring stretch when a 24-N block is suspended from it?
*Wednesday, November 4, 2015 by Anonymous*

**physics**

an object weighs 180N on earth, how much will it weigh on the moon?
*Wednesday, November 4, 2015 by ibrahim a zadawa*

**Physics**

A 100g piece of ice at 0 degrees celcius is placed into a container holding 200g of water, initially at temperature 25 degrees celcius. Heat flows from the water to the ice, cooling the water and melting the ice. Calculate a) how many moles of ice and how many moles of water ...
*Wednesday, November 4, 2015 by Betty*

**Physics**

A jet aircraft is flying due south at 300 m/s at a place where the earth’s magnetic field is 80 µT. Find the potential difference between the wing tips if they are 25 m apart. Which tip has the higher potential?
*Wednesday, November 4, 2015 by Brittany*

**PHYSICS**

A thin rod has a length of 0.339 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. The rod has an angular velocity of 0.687 rad/s and a moment of inertia of 1.03 x 10-3 kg·m2. A bug standing on ...
*Wednesday, November 4, 2015 by Anonymous*

**PHYSICS**

A thin rod has a length of 0.339 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. The rod has an angular velocity of 0.687 rad/s and a moment of inertia of 1.03 x 10-3 kg·m2. A bug standing on ...
*Tuesday, November 3, 2015 by Anonymous*

**PHYSICS**

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
*Tuesday, November 3, 2015 by Anonymous*

**physics**

A spherically symmetric object, with radius R = 0.700 m and mass M = 1.90 kg, rolls without slipping across a horizontal floor, with velocity V = 1.200 m/s. It then rolls up an incline with an angle of inclination θ = 40.0 deg and comes to rest a distance d = 0.177 m up ...
*Tuesday, November 3, 2015 by Juicy*

**PHYSICS**

A hiker, who weighs 976 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4350 N, and rests on two concrete supports, one on each end. He stops 1/3 of the way along the bridge. What is the magnitude of the force that a ...
*Tuesday, November 3, 2015 by Anonymous*

**Physics**

A sprinter accelerates at the start of the race at 8.5 m/s^2. After 1.3 seconds the sprinter runs the rest of the 100m race at a constant velocity. What was the sprinter's time at the finish line?
*Tuesday, November 3, 2015 by David*

**Physics**

An athlete swings a 3.06 kg ball horizontally on the end of a rope. The ball moves in a circle of radius 0.82 m at an angular speed of 0.25 rev/s. What is the tangential speed of the ball? Answer in units of m/s.
*Tuesday, November 3, 2015 by james*

**Physics**

A bomber flies horizontally with a speed of 175 m/s relative to the ground. The altitude of the bomber is 4780 m and the terrain is level. Neglect the effects of air resistance. gravity is 9.8 m/s a) How far from the point vertically under the point of release does a bomb hit ...
*Tuesday, November 3, 2015 by Anonymous *

**Physics**

A ball is projected horizontally from the edge of a table that is 0.465 m high, and it strikes the floor at a point 1.04 m from the base of the table. gravity is 9.8 m/s the initial speed of the ball is 3.376042 m/s ~How high is the ball above the floor when its velocity ...
*Tuesday, November 3, 2015 by Anonymous *

**physics**

You drop a 1.90 kg book to a friend who stands on the ground at distance D = 11.8 m below with outstretched hands at distance d = 1.42 m above the ground. a)What is the speed of the book when it reaches the hands? b)If we substituted a second book with twice the mass, what ...
*Tuesday, November 3, 2015 by John*

**Physics**

Suppose a bouncy ball were thrown against a wall. The ball hit with 15 m/s and then bounced backwards with 15 m/s. The interaction time with the wall was 0.5 ms (5 x 10-3 s). If the ball's mass is 0.1 kg, what is the average force of the wall on the ball?
*Tuesday, November 3, 2015 by Arlin*

**Physics **

A car starts rolling down a 1-in-8 hill (1-in-8 means that for each 8 m traveled along the road, the elevation change is 1 m). A) How fast is it going when it reaches the bottom after traveling 90 m ? Assume an effective coefficient of friction equal to 0.10.
*Tuesday, November 3, 2015 by Brody*

**Physics **

Since friction is a force, how do you determine its magnitude and direction? Use a box sliding across a carpet to illustrate your answer
*Tuesday, November 3, 2015 by IGN*

**Physics**

Two particles, of mass m and mass nm, undergo a head-on, fully elastic collision. (Here n is just a unitless number.) Before colliding the particles approach one another with equal speed v. Snapshots of the particles before, during, and after the collision are shown above. ...
*Tuesday, November 3, 2015 by Andy*

**physics**

A 2kg rock is thrown downward from a height of 3 meters with an initial velocity of 4 m/s. Just before it hits the ground its speed is _____.
*Tuesday, November 3, 2015 by Sydney*

**Physics**

A car going 50 m/s undergoes an acceleration of 2 m/s^2 for 6 seconds what is the final velocity ? How far did it travel while it was accelerating?
*Tuesday, November 3, 2015 by Blanca*

**physics**

A flywheel comprises a uniform circular disk with a moment of inertia of 64.13 Kg m2. It rotates with an angular velocity of 1106. rpm. A constant tangential force is applied at a radial distance of 0.400 m. What energy (in Kilo Joule) must this force dissipate to stop the ...
*Tuesday, November 3, 2015 by Juicy*

**Physics**

A uniform ladder of mass m is 2.5 m long. Its upper end leans against a frictionless wall. The coefficient of static friction between the ladder and the floor is 0.58. How far from the wall can the lower end be placed before the ladder starts to slip? Hint: for the ladder to ...
*Tuesday, November 3, 2015 by Juicy*

**AP 1 Physics**

A motorcycle has a constant speed of 25.0 m/s as it passes over the top of a hill whose radius of curvature is 144 m. The mass of the motorcycle and driver is 326 kg. Find the magnitudes of the following. Centripetal force: mv^2/r = 1414.93 N Normal force: ?? I tried N = mg...
*Tuesday, November 3, 2015 by Lulu*

**physics**

Two springs X and Y have spring constants k and 2k respectively.Spring X is stretched by a force F and spring Y is stretched by a force 2F. Each spring obeysHooke’s law during the extension.The work done in stretching spring X is WX and the work done in stretching spring ...
*Tuesday, November 3, 2015 by varsha *

**Physics**

The instruments attached to a balloon have a mass of 5kg. The balloon is released and exerts an upward force of 100 N. After the balloon has accelerated for 10s, the instruments are released. What is the velocity of the instruments at the moment of release?
*Monday, November 2, 2015 by Bill*

**physics**

To leave Nicholson, you exit via the door to the quad. The door is 40 inches wide and has a mass of 200 kg. You push the door with a perpendicular force of 52.61N exactly 0.86m away from the hinge. This generates the minimum torque, \tau_1, required to open the door. If you ...
*Monday, November 2, 2015 by Kim*

**physics**

a block of mass M = 9.9 kg rests on a bracket of mass m = 5.5 kg. the bracket sits on a frictionless surface. the coefficients of friction between the block and the bracket on which it rests are .4 and .3. what is the maximum force that can be applied if the block is not to ...
*Monday, November 2, 2015 by john*

**physics**

i need help understanding physics. im failing my class and dont want to do anything because i have zero clue where to start. im stuck on this problem currently. a cat pushes a ball from a 7.00 m high window, giving it a horizontal velocity of .20 m/s. how far from the base of ...
*Monday, November 2, 2015 by kaleigh*

**physics**

An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?
*Monday, November 2, 2015 by greg*

**physics **

A tire rotates 140 rpm, how many rotations have been completed in 20 seconds?
*Monday, November 2, 2015 by Emily *

**Physics**

A 1500 kg car is moving 18 m/s how much force is required to bring the car to a stop in 12 seconds
*Monday, November 2, 2015 by Kyeanna*

**Physics**

A block of 3kg is pulled up a smooth slope with a force of 24N and the slope is of an angle 25 degrees. Calculate the acceleration of the block up the slope.
*Monday, November 2, 2015 by Sean*

**physics**

Two similar sphere having charge -2C and +4C respectively are separated by distance "r" exert force (F=16N) third similar neutral sphere is first touched with sphere B and then sphere A. then force between spheres decreases by
*Monday, November 2, 2015 by why nobody is responding?*

**Physics**

A 5.60 kg object is pulled over a rough surface with a constant tension resulting in an acceleration of 3.12 m/s2. There is a friction, and the coefficient of kinetic friction is 0.47. What is the magnitude of the tension?
*Sunday, November 1, 2015 by Andrew Jeong*

**Physics**

A motor cycle, starting from rest, has an acceleration of +2.6 m/s^2. When the motorcycle has traveled a distance of 120 m, it slows down with an acceleration of -1.5 m/s^2 until its velocity is +12 m/s. What is the total displacement of the motorcycle?
*Sunday, November 1, 2015 by Madison*