Friday

November 28, 2014

November 28, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

a 10.0m long bar is attached by a frictionless hing to a wall and held horizontally by a rope that makes an angle of 53 deg with the bar the bar is uniform and weights 39.9 N. how far from the hinge should a 10.0kg mass be suspended for the tension T in the rope to be 125 N
*Monday, November 3, 2014 at 8:32pm*

**Reactor Physics**

There is an infinite non-multiplying medium with diffusion length 3 cm and diffusion coefficient 1 cm. There are 3 point sources of neutrons on the x-y plane: „h Source S1 = 108 s-1 at (x, y) = (2 cm, 0) „h Source S2 = 2*108 s-1 at (x, y) = (0, 2 cm) „h Source ...
*Monday, November 3, 2014 at 7:56pm*

**Reactor Physics**

Design the smallest cubical uniform nuclear reactor which will have a fission rate at any point not greater than 2.1*1011 fissions.cm-3.s-1 and a fission power not smaller than 2,500 MW. [Neglect the extrapolation distance.]
*Monday, November 3, 2014 at 7:52pm*

**physics**

Erica throws a ball out of a window with a horizontal speed of 3.8m/s. If the ball hits the ground 15m away, how high up is the window? My work: X-direction v1x=3.8m/s v2x=3.8m/s a=0m/s2 d=15m y-direction I don't know how to find the initial and final velocity. a=-9.8m/s2 ...
*Monday, November 3, 2014 at 7:43pm*

**physics**

A hollow 0.358 kg sphere rolls without slipping down an inclined plane that makes an angle of 41.0o with the horizontal direction. The sphere is released from rest a distance 0.734 m from the lower end of the plane. a. How fast is the hollow sphere moving as it reaches the end...
*Monday, November 3, 2014 at 7:41pm*

**physics**

A hollow 0.358 kg sphere rolls without slipping down an inclined plane that makes an angle of 41.0o with the horizontal direction. The sphere is released from rest a distance 0.734 m from the lower end of the plane. a. How fast is the hollow sphere moving as it reaches the end...
*Monday, November 3, 2014 at 7:40pm*

**physics**

Please Help The human outer ear contains a more-or-less cylindrical cavity called the auditory canal that behaves like a resonant tube to aid in the hearing process. One end terminates at the eardrum (tympanic membrane), while the other opens to the outside. (See the figure (...
*Monday, November 3, 2014 at 7:24pm*

**Physics**

Consider the rods plus disc system shown in the Figure. The rod has a length L =0.50 m, and mass M = 0.270kg. The large disc has a radius of R = 0.130m and mass m=0.810kg. The second disk should be treated as a point mass of 0.405kg. It is glued to the rod at position X = 0....
*Monday, November 3, 2014 at 7:22pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
*Monday, November 3, 2014 at 7:22pm*

**PHYSICS**

A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
*Monday, November 3, 2014 at 7:04pm*

**PHYSICS**

A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
*Monday, November 3, 2014 at 7:03pm*

**Physics**

A circular coil (660 turns, radius = 0.037 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.024 s, the normal makes an angle of 45o with the field because the coil has made one-eighth of a ...
*Monday, November 3, 2014 at 7:02pm*

**Physics 11U**

At the moment when a shot putter releases a 5.00 kg shot, the shot is 2.00 m above the ground and travelling at 15.0 m/s. It reaches a maximum height of 8.0 m above the ground and then falls to the ground. Assume air resistance is negligible. a) What was the velocity of the ...
*Monday, November 3, 2014 at 6:43pm*

**physics**

car doing 60 mph and skids for 52.3 meters what is the speed at end of skid co/friction is 0.693 urgent help please
*Monday, November 3, 2014 at 6:35pm*

**Physics**

A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...
*Monday, November 3, 2014 at 6:22pm*

**Science Physics**

How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
*Monday, November 3, 2014 at 5:58pm*

**physics**

Please help I cant breath with this qn, due today exam pending, thanks for taking your time to help. The human outer ear contains a more-or-less cylindrical cavity called the auditory canal that behaves like a resonant tube to aid in the hearing process. One end terminates at ...
*Monday, November 3, 2014 at 5:55pm*

**Physics (heat)**

A coal sample yields 1.25 X 10^4 Btu/lb. How many foot-pounds of work result from burning 1.00 ton of this coal?
*Monday, November 3, 2014 at 5:35pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
*Monday, November 3, 2014 at 5:32pm*

**physics**

Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 72.7 N, Jill pulls with 79.9 N in the northeast direction, and Jane pulls to the southeast with 103 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
*Monday, November 3, 2014 at 5:20pm*

**Physics**

A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...
*Monday, November 3, 2014 at 5:17pm*

**Physics **

A moving object has a kinetic energy of 182 J and a momentum with magnitude of 27.6 kg·m/s. (a) Determine the mass of the object. kg (b) Determine the speed of the object. m/s
*Monday, November 3, 2014 at 4:43pm*

**Physics**

A 73.5 kg ice skater moving to the right with a velocity of 2.97 m/s throws a 0.21 kg snowball to the right with a velocity of 29.3 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*Monday, November 3, 2014 at 4:27pm*

**Science Physics**

A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?
*Monday, November 3, 2014 at 4:15pm*

**physics**

A disk with mass m = 8.1 kg and radius R = 0.33 m begins at rest and accelerates uniformly for t = 18 s, to a final angular speed of ω = 34 rad/s. What is the angular acceleration of the disk? What is the angular displacement over the 18 s? What is the moment of inertia ...
*Monday, November 3, 2014 at 3:40pm*

**Physics**

A beaker of mass 5kg containing oil of mass 17.4 kg and density 8.5 x102kg/m3 rests on the scale A block of iron of mass 6.7kg is suspended from the spring scale and completely submerged in the oil as shown in Figure below. Determine the equilibrium readings of lower scale in ...
*Monday, November 3, 2014 at 2:17pm*

**physics**

Which parameter of a projectile depends on the horizontal as well as the vertical component of velocity of projection?
*Monday, November 3, 2014 at 2:12pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
*Monday, November 3, 2014 at 1:41pm*

**physics **

The wheels, axle, and handles of a wheelbarrow weigh 60.0 N. The center of gravity of the wheelbarrow alone is 0.600 m from the axel. The distance from the axle to the hands of the operator is 1.3 m. The force applied by the operator to the end of the handles is 250 newtons. ...
*Monday, November 3, 2014 at 1:16pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
*Monday, November 3, 2014 at 1:08pm*

**physics**

A clock has a brass pendulum with a period of 1.000 s at 18.9°C. Suppose the clock is moved to a location where the average temperature is 33.1°C. How much time will the clock lose or gain in 6 days?
*Monday, November 3, 2014 at 12:03pm*

**physics**

An aluminum vessel with a volume capacity of 530 cm3 is filled with water to the brim at 20.0°C. The vessel and contents are heated heated to 42.5°C. During the heating process, will the water spill over the top (in this case the answer would be positive), will there ...
*Monday, November 3, 2014 at 12:02pm*

**physics**

A 15.0-gal container is filled with gasoline. Neglect the change in volume of the container and find how many gallons are lost if the temperature increases by 31.9°F. The volume expansion coefficient of gasoline is 9.60·10-4°C-1
*Monday, November 3, 2014 at 12:02pm*

**physics**

On a cool morning, with the temperature at 9.1 °C, a painter fills a 5-gal container to the brim with turpentine. When the temperature reaches 27.1 °C, how much fluid spills out of the container? The volume expansion coefficient for this brand of turpentine is 7.7&...
*Monday, November 3, 2014 at 12:00pm*

**physics **

A 750-N physics student carries a 4.0 meter board, uniform in shape, and 190 newtons in weight to our swimming pool. The student then places the board on the deck and next to the pool in such a way so 1.5 meters of the board extends out over the edge of the pool. How far, in ...
*Monday, November 3, 2014 at 11:31am*

**Physics **

mass of 2 kg is released from rest at the top of the inclined plane shown below. at bottom speed is 5 m/s how much work was done by friction between incline and mass
*Monday, November 3, 2014 at 8:29am*

**Physics **

3.2 kg block is given an initial velocity of 12 m/s across horizontal surface. after travels 8 m speed is 2.4 m/s. determine coefficient of friction bewern block and surface and how far it travels before coming to rest
*Monday, November 3, 2014 at 8:28am*

**Physics**

A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
*Monday, November 3, 2014 at 2:47am*

**Physics**

A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
*Monday, November 3, 2014 at 2:45am*

**physics**

which of acceleration age speed temperature and velocity are vector quantities
*Monday, November 3, 2014 at 2:41am*

**physics**

A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N,
*Monday, November 3, 2014 at 2:16am*

**Physics**

A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of its horizontal component? Answer in units of N.
*Sunday, November 2, 2014 at 11:20pm*

**AP Physics 1**

A cat climbs 8m directly up a tree. What is the horizontal component of the cat's displacement? Answer in units of m.
*Sunday, November 2, 2014 at 11:13pm*

**Physics **

Repairing a spaceship CJ drops a hammer and it took .68 s to fall .90 m to the ground. What is the magnitude of the gravitational accerleration on mars
*Sunday, November 2, 2014 at 11:00pm*

**physics**

The red box has a mass of 20.1 kg and the blue box has a mass of 14.5 kg and the force is 290 N. To the nearest tenth of a m/s2 what is the acceleration of the combination? The diagram looks like this: F --> [Red Box][Blue Box] On a straight plane, not on an incline.
*Sunday, November 2, 2014 at 9:37pm*

**Physics **

The 56 kg man in the roller coaster car is sitting on a bathroom scale. If he is traveling at 40.9 m/s at the point shown and the radius of the vertical coaster track is 87 meters, to the nearest newton what does the scale read? What is the answer to the previous problem if ...
*Sunday, November 2, 2014 at 9:08pm*

**physics**

A marble rolls off the edge of a table that is 0.82 m high. The marble is moving at a speed of 0.11 m/s at the moment that it leaves the edge of the table. How far from the table does the marble land?
*Sunday, November 2, 2014 at 8:54pm*

**physics**

Arann launches a rock into the air such that it rises 20.0 m in the first third (time wise) of its ascent to maximum height. Determine the rock's maximum height and launch speed. Determine the time(s) at which the ball is at a height of 10m. PLEASE HELP
*Sunday, November 2, 2014 at 8:31pm*

**Physics**

A 1000 kg Toyota, initially traveling at 40 mph, collides into the rear end of a 2000 kg Cadillac, initially stopped at a red light. The bumpers lock and the two cars skid for 2 seconds before coming to rest. Calculate the coefficient of kinetic friction between the tires and ...
*Sunday, November 2, 2014 at 7:51pm*

**Physics (projectile motion)**

Projectile fired in earths gravitational field at a height of of 0.90m above ground level, with a horizontal velocity of 9m/s. How far will the ball fly before hitting the ground? How long will the ball stay in the air?
*Sunday, November 2, 2014 at 7:46pm*

**Physics**

Hi I see another student actually posted this question... but got no answer... is someone able to look at it? see below - a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the...
*Sunday, November 2, 2014 at 7:46pm*

**physics **

A remote-controlled car’s wheel accelerates at 22.6 rad/s2. If the wheel begins with an angular speed of 10.6 rad/s, what is the wheel’s angular speed after exactly three full turns?
*Sunday, November 2, 2014 at 7:42pm*

**physics**

A thin rod of mass M and length L is lying on a frictionless table. It is given an impulse of 4.5 N*s by a force of magnitude F on one end at an angle of 35 degrees to the rod. How far will the center of mass of the rod travel when the rod has completed 12 revolutions?
*Sunday, November 2, 2014 at 7:00pm*

**physics**

A block of mass m = 350 g is released from rest and slides down a frictionless track of height h = 58.9 cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.35 cm...
*Sunday, November 2, 2014 at 6:50pm*

**PHYSICS**

last homework question I cannot figure out.... H E L P :} a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the target, and a speed (0.466)v after passing through the target. ...
*Sunday, November 2, 2014 at 6:45pm*

**Physics**

As shown in the figure below, a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the target, and a speed (0.466)v after passing through the target. The collision is inelastic ...
*Sunday, November 2, 2014 at 6:28pm*

**physics**

find the mass of a ball on a roof 30 meters high, if the ball's gravitational energy is 58.8 joules.
*Sunday, November 2, 2014 at 6:27pm*

**physics**

A projectile is fired at 12.5 m/s at an angle of 53.1 with the horizontal from a point 75m above the ground. A) How long does it take to reach the ground? B)What max height does it reach? C) What horizontal distance does it travel before striking the ground? D) With what ...
*Sunday, November 2, 2014 at 6:06pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 45.7 cm and a mass of 9.1kg. How many revolutions did one of the front tires (assuming only the back tires spun upon ...
*Sunday, November 2, 2014 at 5:49pm*

**physics **

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 45.7 cm and a mass of 9.1kg. How many revolutions did one of the front tires (assuming only the back tires spun upon ...
*Sunday, November 2, 2014 at 5:42pm*

**physics**

A car weighing 1.0 x 10^4N is parked on a 34 degree slope. The brakes fail and the car starts to slide down the hill. Assume no friction. Show your work, and determine a) the acceleration of the car, and b) after it has moved 28.0 m, how fast is it moving?
*Sunday, November 2, 2014 at 4:38pm*

**Physics**

a place kicker must kick a football from a Lint 36 meters from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.04 meters high. When kicked, the ball leaves the ground with a speed of 20 meters per second at an angle of 50 degrees to the ...
*Sunday, November 2, 2014 at 4:15pm*

**physics**

a projectile is fired at 50 meters per second at an angle of 30 degrees below the horizontal off a cliff that is 50 meters high. How far away and at what speed and angle will this projectile land?
*Sunday, November 2, 2014 at 4:10pm*

**Physics**

A block M1 of mass 13.0 kg sits on top of a larger block M2 of mass 23.0 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.440. The kinetic friction coefficient between the lower block and the flat surface is 0.140. A ...
*Sunday, November 2, 2014 at 3:27pm*

**physics**

A space station Radar locates sattelites A and B at a certain moment: A_0=(a_1,0,1^3), B_0=(0,b_2,b_3) the space station is located at (0,0,0) and the sattelites moves with a uniform velocity related to the space station: v_A=(V_A,0,0), v_B=(V_B,V_B,0) what is the minimal ...
*Sunday, November 2, 2014 at 2:32pm*

**physics**

What is the cause of esacape velocity
*Sunday, November 2, 2014 at 1:08pm*

**physics**

How can the equation be prove:maximum height,time of flight and maximun range in projectile?
*Sunday, November 2, 2014 at 12:42pm*

**physics**

A bus moves from rest with a uniform acceleration of 2ms(square)for the first 10s.
*Sunday, November 2, 2014 at 12:33pm*

**Physics**

An ant climbs onto the side of a bicycle tire a distance of 40.0 m from the hub. If the 0.010 g ant can hold onto the tire with a force of 4.34*10 to the -4, at what frequency would the tire fling the ant of assuming the wheel is spun on a horizontal plane? so what I did for ...
*Sunday, November 2, 2014 at 11:09am*

**Physics**

Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)
*Sunday, November 2, 2014 at 11:03am*

**physics**

During burnouts at the local drag strip, a dragster’s 45.0kg tire rotates at a speed of 35.0m/s. If the tire has a radius of 0.500m what is the centripetal force acting on the center of the tire rim during this burnout?
*Sunday, November 2, 2014 at 10:12am*

**Physics**

Two forces are applied to a car in an effort to accelerate it, as shown below. The first force, F1 = 328 N, is applied at an angle α = 35° to the forward dashed line. The second force, F2 = 464 N, is applied at an angle β = 13° to the forward dashed line. (a...
*Sunday, November 2, 2014 at 9:51am*

**Physics**

A laser source emits lights of wavelength 62100m and has an output of 35mW calculate how many photons are emitted per minute by this laser sourse
*Sunday, November 2, 2014 at 9:43am*

**Physics**

When maximum power is transferred to an external resistor R by a battery of emf E and internal resistance r, the ratio of r/R is? Answer 1:1 Can some please explain? Thankkks!
*Sunday, November 2, 2014 at 8:49am*

**physics**

a 1500kg car travelling east with a speed of 20m/s collides at an intesection with a 2500kg van travelling south at a speed of 15m/s.The vehicle undergoes a perfectly inelastic collision, and the wreckage slides 6m before coming to rest.Find the magnitude and direction of the ...
*Sunday, November 2, 2014 at 3:59am*

**physics**

a wheel 0.45m in diameter starts from rest and rotates with uniform acceleration to 6000 radians per minute in a time of 4s.Find angular acceleration of the wheel and speed of a point on the rim at end of 4s =w/t
*Sunday, November 2, 2014 at 3:49am*

**physics **

A cylindrically shaped space station is rotating about the axis of the cylinder to create artificial gravity. The radius of the cylinder is 159 m. The moment of inertia of the station without people is 4.23 x 109 kg·m2. Suppose 299 people, with an average mass of 67.0 ...
*Sunday, November 2, 2014 at 1:04am*

**physics**

a warehouse employee is pushing a 38 kg desk across a floor at a constant speed of 0.4 m/s. How much work must the employee do on the desk to change the speed of 1.5m/s?
*Sunday, November 2, 2014 at 1:34am*

**Physics **

A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 7.83 m/s at the bottom of the rise. ...
*Sunday, November 2, 2014 at 12:45am*

**physics, math**

A hot air balloon with a mass of 18.0 kg is accelerating upward at 1.80 m/s^2 (Anet = 1.80 m/s^2). What is the weight and buoyant force acting on the balloon?
*Saturday, November 1, 2014 at 10:05pm*

**Physics**

What is the maximum speed of a 3.40g particle that oscillates between x =2.0mm and x =8.0mm in the figure? (Figure 1) Description of Figure: Parabola with the lowest point at (4,1) parabola starts at(2,5) and ends at (8,5) Y-axis is U(J) X-axis is x(mm)
*Saturday, November 1, 2014 at 9:55pm*

**physics**

An m=150 g block hits an M= 265 g block initially at rest on a horizontal surface. After impact they stick together and slide 7.47 m before coming to rest. The coefficient of friction between blocks and surface is 0.39. a) What is in m/s the speed of both blocks immediately ...
*Saturday, November 1, 2014 at 9:54pm*

**Physics**

What is the maximum speed of a 3.40g particle that oscillates between x =2.0mm and x =8.0mm in the figure? (Figure 1) Description of Figure: Parabola with the lowest point at (4,1) parabola starts at(2,5) and ends at (8,5) Y-axis is U(J) X-axis is x(mm)
*Saturday, November 1, 2014 at 8:34pm*

**Physics**

A bowling ball encounters a 0.760 m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 5.40 m/s at the bottom of the rise. ...
*Saturday, November 1, 2014 at 7:50pm*

**Physics**

1.71 kg of glass (ρ = 2.66 x 10^3 kg/m3) is shaped into a hollow spherical shell that just barely floats in water. What are the (a) outer and (b) inner radii of the shell? Do not assume the shell is thin. Volume = 2.66 * 10^3/1.71 V=1555.56 m^3 V=pi(r^2)h
*Saturday, November 1, 2014 at 6:27pm*

**Physics**

The colors we see when looking at an object depend on the _________. A) density of the object B) amplitude of the light we see C) frequency of the light we see D) mass of the object we are looking at I think it is A
*Saturday, November 1, 2014 at 5:33pm*

**Physics**

You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
*Saturday, November 1, 2014 at 2:31pm*

**Physics**

A car is traveling along a road, and its engine is turning over with an angular velocity of +190 rad/s. The driver steps on the accelerator, and in a time of 13.0 s the angular velocity increases to +300 rad/s. (a) What would have been the angular displacement of the engine if...
*Saturday, November 1, 2014 at 2:11pm*

**physics**

A dart is thrown horizontally toward X at 30 m/s as shown. It hits Y 0.29 s later. The distance XY in centimeters is:
*Saturday, November 1, 2014 at 1:47pm*

**physics**

A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?
*Saturday, November 1, 2014 at 11:18am*

**Physics**

Three particles X, Y, and Z of masses 2 kg, 5 kg, and 4 kg respectively are arranged in order along a straight line. Y is 5.0 m from X and 7.0 m from Z. The distance of the centre of mass of the system of mass from X is? ANS: 6.6 m Help please? I dont even know how to start :(
*Saturday, November 1, 2014 at 8:57am*

**Physics**

A 56kg student is standing atop a spring in an elevator that is accelerating upward at 3.1m/s2 . The spring constant is 2100N/m . By how much is the spring compressed?
*Friday, October 31, 2014 at 11:55pm*

**physics**

The car stationary in front of a red traffic light. As the light turns green , a truck goes past at a constant velocity of 1.5 m/s. At the same moment , the car begins to accelerate at 1.25 m/s 2 . When it reaches 2.5 m/s the car continues at this velocity . When does the car ...
*Friday, October 31, 2014 at 11:36pm*

**physics**

The car stationary in front of a red traffic light. As the light turns green , a truck goes past at a constant velocity of 1.5 m/s. At the same moment , the car begins to accelerate at 1.25 m/s 2 . When it reaches 2.5 m/s the car continues at this velocity . When does the car ...
*Friday, October 31, 2014 at 11:32pm*

**physics**

A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum ...
*Friday, October 31, 2014 at 11:16pm*

**physics**

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 356, 1460, and 5400 m/s, respectively. The sound ...
*Friday, October 31, 2014 at 10:58pm*

**physics**

A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum ...
*Friday, October 31, 2014 at 10:14pm*

**Physics**

A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and radius R = 2.81 cm, as shown in the figure. a) Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and ...
*Friday, October 31, 2014 at 8:08pm*

**Physics**

I would really appreciate the help for this assignment. A small reasoning for the answer would be very helpful. Thank you. A sphere of mass m and radius r is attached to the rim of a disk (mass M, radius R). The disk is rotating counter-clockwise with a constant period T ...
*Friday, October 31, 2014 at 8:02pm*

**physics**

The drawing shows two transverse waves traveling on two strings. The linear density of each string is 0.0483 kg/m, and the tension is provided by a 15.0-N block that is hanging from the string. Determine the speed of the wave in part (a) and part (b) of the drawing.
*Friday, October 31, 2014 at 8:01pm*

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