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January 30, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift. Not sure how to answer this.
Friday, January 31, 2014 at 11:08am

Physics
An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage
Friday, January 31, 2014 at 11:05am

Physics
A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage)
Friday, January 31, 2014 at 11:05am

Physics
How much (in Celsius degrees) is the temperature of 1.3 kg of alcohol raised by adding 4.1 kcal of heat? The following piece of information may come in handy: specific heat of alcohol is 0.58 kcal/kgC.
Friday, January 31, 2014 at 11:00am

Physics
An aluminum calorimetry cup [mc = 0.6 kg, cc = 0.22 kcal/(kgC)] is filled with water [mw = 2.4 kg, cw = 1 kcal/(kgC)]. It is at a temperature of 30C. A sample of an unknown substance with mass mm = 2.34 kg, originally at a temperature of 210C, is added. After a while, the ...
Friday, January 31, 2014 at 10:56am

physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is observed: After the 1st bounce, the ball ...
Friday, January 31, 2014 at 9:46am

physics
A man steps off a 100 m diving platform. How long will it take him to drop the …first 50 m? How long will it take him to drop the second 50 m?
Friday, January 31, 2014 at 1:12am

physics
When a bullet leaves a barrel of a rifle, it is moving 640 m/s. If the barrel is 1.20 m long, and if the bullet undergoes constant acceleration while within the barrel, how long after the rifle is fired will the bullet emerge from the end of the barrel?
Friday, January 31, 2014 at 1:10am

physics
As soon as the stop light changes from red to green, a car at rest at the intersection accelerates with a constant acceleration of 2.2 m/s/s. At the same moment, a truck passes by, moving at a constant speed of 9.5 m/s. How far beyond the intersection will the car catch the ...
Friday, January 31, 2014 at 1:08am

physics
A superball is dropped from rest from a height of 2.0m. It bounces repeatedly from the floor, as superballs are prone to do. After each bounce the ball dissipates some energy, so eventually it comes to rest. The following pattern is observed: After the 1st bounce, the ball ...
Friday, January 31, 2014 at 12:56am

physics
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 30 s per increment, and the scale for the velocity axis is 50 m/s per increment.
Friday, January 31, 2014 at 12:33am

Physics
The Nova laser at Lawrence Livermore National Laboratory in California is used in studies of initiating controlled nuclear fusion (Section 45.4). It can deliver a power of 1.60 × 1013 W over a time interval of 2.50 ns. Compare its energy output in one such time interval ...
Friday, January 31, 2014 at 12:03am

Physics
The Nova laser at Lawrence Livermore National Laboratory in California is used in studies of initiating controlled nuclear fusion (Section 45.4). It can deliver a power of 1.60 × 1013 W over a time interval of 2.50 ns. Compare its energy output in one such time interval ...
Friday, January 31, 2014 at 12:03am

Physics
A water heater is operated by solar power. If solar collector has an area of 6.00m^2, and the intensity delivered by sunlight is 550W/m^2, how long does it take to increase the temperature of 1m^3 of water from 20°Cto 60°C?
Thursday, January 30, 2014 at 11:53pm

Physics
How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
Thursday, January 30, 2014 at 10:33pm

Physics
How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
Thursday, January 30, 2014 at 10:32pm

physics
A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.29 ✕ 103 kg/m3. If the bowl has a radius of 5.30 cm and negligible mass, what is the mass of the frog?
Thursday, January 30, 2014 at 10:26pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:50pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:45pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:38pm

physics
A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
Thursday, January 30, 2014 at 9:37pm

Physics
Two speeding lead bullets each of mass 5 g and temperature of 20°C collide head on at speeds of 500m/s each. Assuming a perfectly inelastic collision and no loss of energy to the atmospheres, describe the final state of the two bullet system.
Thursday, January 30, 2014 at 8:41pm

Physics
A bar of gold is in thermal contact with a bar of silver of the same length and area. One end of the compound bar is maintained at 80.0°C while the opposite end is at 30.0°C. When the energy transfer reaches steady state, what is the temperature at the junction?
Thursday, January 30, 2014 at 8:40pm

physics
A glass window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window.
Thursday, January 30, 2014 at 8:40pm

Physics
A small 9g plastic ball is suspended by a 35 cm long string in a uniform electric field 1110 N/C as shown. The ball is in equilibrium when the string makes a 23 degree angle with the vertical.
Thursday, January 30, 2014 at 8:01pm

Physics
On a curved roadway of radius 100 m, the suggested speed limit is 35 mph (approximately 16 m/s). What must the coefficient of friction be between a car’s tires and the road for the car to safely negotiate the curve at the posted speed?
Thursday, January 30, 2014 at 7:47pm

Physics 141
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 100 s per increment, and the scale for the velocity axis is 110 m/s per ...
Thursday, January 30, 2014 at 5:35pm

physics
A)A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 19.0o below the horizontal. It strikes the ground 2.50 s later. How far horizontally from the base of the building does the ball strike the ground? B)...
Thursday, January 30, 2014 at 4:21pm

physics
Two point charges lie on the x axis. A charge of 6.2μC is at the origin, and a charge of -9.5μC is at x=10.0cm. What is the net electric field at (a) x=−4.0cm and at (b) x=+4.0cm?
Thursday, January 30, 2014 at 3:07pm

Physics
On an unknown planet, a pendulum of length 1.5 m swings with a period of 3.3 s. What is the acceleration of gravity on this planet?
Thursday, January 30, 2014 at 2:59pm

Physics
A ball player catches a ball 3.33s after throwing it vertically upward. a) with what speed did he throw it? b) what height did it reach?
Thursday, January 30, 2014 at 2:26pm

physics
A spring (k=80n/m) lies on a frictionless table, one end connected to the wall, the other to a 4kg block. The block is pulled, stretching the spring .5m. and then released. A) max elastic potential energy of system? b) total energy? C) what is the acceleration of the block at ...
Thursday, January 30, 2014 at 1:56pm

Physics
An object is dropped from a platform100 ft high. Ignoring wind resistance, how long will it take to reach the ground?
Thursday, January 30, 2014 at 1:05pm

physics
If the ball is in equilibrium when the string makes a 43◦ angle with the vertical as indicated, what is the net charge on the ball? The acceleration due to gravity is 9.81 m/s 2. Answer in units of C
Thursday, January 30, 2014 at 12:04pm

Physics
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 10^3 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
Thursday, January 30, 2014 at 11:14am

Physics
A severe thunderstorm dumped 2.4 in of rain in 30 min on a town of area 35 km^2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
Thursday, January 30, 2014 at 11:12am

physics
A flywheel has a small magnet mounted on it. EAch time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10cm wide. The flywheel is rotating at a rate of about 3000 revolutions per minute.Why will the time base...
Thursday, January 30, 2014 at 7:01am

Physics
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:48am

physics
This question is roughly based on some historical data from tropical cyclone Clare which crossed the WA coast near Dampier in January 2006. It started off as a tropical low north of the Northern Territory and was upgraded to tropical cyclone intensity at 8 pm on Saturday 7 ...
Thursday, January 30, 2014 at 1:27am

physics
A car is stopped at a set of traffic lights. It takes off, accelerating at 4.5m/s2 until it is travelling at 60km/h. It maintains this velocity for 3 minutes before braking to a halt over 60m at another set of traffic lights. How far has the car travelled in this trip and how ...
Thursday, January 30, 2014 at 1:26am

physics
A basket weighing 0.3kg is suspended from two ropes which are tied to a horizontal beam. The rope on the left is at an angle of 63° and the rope on the right is at an angle of 32° with respect to the beam. What mass of rocks could be placed in the bucket before the ...
Thursday, January 30, 2014 at 1:26am

physics
On a day with a breeze blowing from the west at 8.5km/h, a remote control helicopter, facing north, takes off vertically from a level field at full power. It has a mass of 700g and the propeller generates 10N of thrust when running at full power. Once it reaches a height of 5m...
Thursday, January 30, 2014 at 1:25am

physics
Wavelength in a Closed Column Here is the prompt: We place a speaker near the top of a drinking glass. The speaker emits sound waves with a frequency of 3.75 kHz. The glass is 14.1 cm deep. As I pour water into the glass, I find that at certain levels the sound is enhanced due...
Thursday, January 30, 2014 at 12:24am

Physics 112
Moving a charge from point A, where the potential is 370V , to point B, where the potential is 190V , takes 4.1×10−4J of work. Part A What is the value of the charge?
Thursday, January 30, 2014 at 12:13am

physics
Four charges −8 × 10^−9 C at (0 m, 0 m), −7 × 10^−9 C at (5 m, 1 m), −1 × 10^−9 C at (−2 m, −3 m), and 2 × 10^−9 C at (−2 m, 4 m), are arranged in the (x, y) plane as shown. Find the magnitude ...
Wednesday, January 29, 2014 at 11:26pm

Physics
Problem 1 (80 points) Consider a spring of equilibrium length L, lying horizontally in a frictionless trough. The spring has cross sectional area S perpendicular to its length. The trough constrains the motion of the spring so that any wave propagating along the spring is a ...
Wednesday, January 29, 2014 at 11:24pm

physics
A motorcycle stunt driver zooms off the end of a cliff at a speed of 30 meters per second. If he lands after 0.75 seconds, what is the height of the cliff?
Wednesday, January 29, 2014 at 11:16pm

physics
A river flows due east at 1.65 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.7 m/s due north relative to the water. What is the velocity of the boat relative to shore?
Wednesday, January 29, 2014 at 9:50pm

Physics Speed of Sound
Does sound travel faster in wood or water?
Wednesday, January 29, 2014 at 8:47pm

physics
A small block is released from rest at the top of a frictionless incline. The distance from the top of the incline to the bottom, measured along the incline, is 3.60 m. The vertical distance from the top of the incline to the bottom is 1.36 m. If g = 9.80 m/s2, what is the ...
Wednesday, January 29, 2014 at 4:11pm

Physics
Problem 1 (80 points) Consider a spring of equilibrium length L, lying horizontally in a frictionless trough. The spring has cross sectional area S perpendicular to its length. The trough constrains the motion of the spring so that any wave propagating along the spring is a ...
Wednesday, January 29, 2014 at 3:50pm

physics
A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate?
Wednesday, January 29, 2014 at 3:25pm

Physics
Snells law lab
Wednesday, January 29, 2014 at 2:53pm

physics
A 3.90 kg block is in equilibrium on an incline of 27.5◦ . The acceleration of gravity is 9.81 m/s 2 . What is Fn of the incline on the block? Answer in units of N
Wednesday, January 29, 2014 at 2:52pm

physics
What neutralizes acid rain?
Wednesday, January 29, 2014 at 1:51pm

Physics
Please help! 400 calories of heat are added to 40grams of water at 20celcius . What's the final temp reached ?
Wednesday, January 29, 2014 at 12:51pm

Physics
A car experiences a constant acceleration of 2.3 m/s2. How long does it take (in s) for the car's speed to increase from 6.6 m/s to 17.9 m/s?
Wednesday, January 29, 2014 at 11:59am

physics
What neutralizes acid rain?
Wednesday, January 29, 2014 at 8:46am

physics
A wave travels a distance of 20m in 3s. The distance btw successive crests of the wave is 4cm. What is the frequency of the wave?
Wednesday, January 29, 2014 at 8:21am

physics
A toy rocket is launched at an initial velocity of 50 m/s at an angle of 75° with the horizontal. Write parametric equations to represent the path of the rocket. (A)x = 50t cos 75°y = 50t sin 75° – 4.9t2 (B)x = 50t cos 75°y = 50t sin 75° – 16t2
Wednesday, January 29, 2014 at 12:43am

Physics
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface. To do this, compare the gravitational force on an orbiting astronaut to the force on the astronaut here at Earth’s ...
Tuesday, January 28, 2014 at 11:18pm

PHYSICS
Suppose that the electric potential outside a living cell is higher than that inside the cell by 0.0928 V. How much work is done by the electric force when a sodium ion (charge = +e) moves from the outside to the inside? no idea how to do this can i just have the step by step ...
Tuesday, January 28, 2014 at 11:02pm

Physics
A jogger travels a route that has two parts. The first is a displacement of 2.20 km due south, and the second involves a displacement that points due east. The resultant displacement + has a magnitude of 4.10 km. (a) What is the magnitude of , and what is the direction of + as...
Tuesday, January 28, 2014 at 10:18pm

Physics
A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 32.0 m/s. Then the truck travels for 76.0 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00 s. What is the average ...
Tuesday, January 28, 2014 at 10:00pm

Physics
A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
Tuesday, January 28, 2014 at 9:45pm

Physics
A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
Tuesday, January 28, 2014 at 9:45pm

PHYSICS
A block of mass m1 = 28 kg rests on a wedge of angle θ = 53∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to ...
Tuesday, January 28, 2014 at 9:05pm

physics
At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.64 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find the change in its ...
Tuesday, January 28, 2014 at 8:54pm

Physics
A dirt biker races up a 15° incline and then takes off in an attempt to clear an obstacle. The end of the ramp is 3 m off the ground. A 4-m high obstacle is located 20 m from the base of the ramp. What minimum take-off speed is required for the daredevil to clear the ...
Tuesday, January 28, 2014 at 8:24pm

physics
A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 450 N at an angle of 15° with the centerline of the canal. What is the net force on ...
Tuesday, January 28, 2014 at 8:21pm

Physics
A 2.12 m tall basketball player wants to sink the ball into a basket located 14 m from the player, as in Figure P3.58. If he shoots the ball at a 46° angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?
Tuesday, January 28, 2014 at 8:20pm

college physics
To tighten a bolt, you push with a force of 76N at the end of a wrench handle that is 0.26m from the axis of the bolt. What torque are you exerting?
Tuesday, January 28, 2014 at 8:11pm

Physics
A metal with a work function of 2.40 eV is illuminated by a beam of monochromatic light. If the stopping potential is 2.5V, what is the wavelength of the light?
Tuesday, January 28, 2014 at 7:50pm

Physics
Spring on Incline The block in the figure is initially at rest on an inclined plane at the equilibrium position that it would have if there were no friction between the block and the plane. How much work is required to move the block 25 cm down the plane if the frictional ...
Tuesday, January 28, 2014 at 7:46pm

Physics
What is the instantaneous velocity of a freely falling object 7.0s after it is released from a position of rest? What is its average velocity during this 7.0-s interval? How far will it fall during this time?
Tuesday, January 28, 2014 at 7:39pm

PHYSICS
A proton, initially traveling in the +x-direction with a speed of 5.30×105m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.38×10−7s , the proton’s velocity is directed 45 ∘ above the +x-axis. ...
Tuesday, January 28, 2014 at 6:23pm

physics
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface.
Tuesday, January 28, 2014 at 4:56pm

physics
sin inverse of .032
Tuesday, January 28, 2014 at 4:44pm

Physics
A copper sheet of thickness 2.49 mm is bonded to a steel sheet of thickness 1.51 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 24.1°C. a) Determine the temperature (in °C) of the copper-steel interface. b) ...
Tuesday, January 28, 2014 at 3:24pm

Physics
A block of mass m1 = 28 kg rests on a wedge of angle θ = 53∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to ...
Tuesday, January 28, 2014 at 2:56pm

physics
a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?
Tuesday, January 28, 2014 at 2:45pm

physics
A block of mass m1 = 28 kg rests on a wedge of angle θ = 53∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to ...
Tuesday, January 28, 2014 at 2:27pm

physics
A diver springs upward with an initial speed of 2.58 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water.(b) What is the highest point he reaches above the water?
Tuesday, January 28, 2014 at 12:35pm

physics 1
In an historical movie, two knights on horseback start from rest 88.7 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.386 m/s2, while Sir Alfred's has a magnitude of 0.359 m/s2. Relative to Sir George's ...
Tuesday, January 28, 2014 at 11:48am

physics 1
Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initial velocity of +6700 m/s, while rocket B has an initial velocity of +9700 m/s. After a time t both rockets are again side by side, the displacement of...
Tuesday, January 28, 2014 at 11:44am

Physics
A 70 kg person is at the top of a 10 m tall slide. Ignoring friction, what is his or her speed at the halfway point where he or she is 5 m from the bottom of the slide? What is his or her speed at the bottom of the slide?
Tuesday, January 28, 2014 at 11:33am

Physics
A 70 kg person is riding on a frictionless skateboard at 5 m/s. A friend facing him throws a 5 kg ball toward him at 20 m/s. What is his final speed after catching the ball?
Tuesday, January 28, 2014 at 11:32am

physics
A cart is driven by a large propeller or fan, which can accelerate or decelerate the cart. The cart starts out at the position x = 0 m, with an initial velocity of + 3.3 m/s and a constant acceleration due to the fan. The direction to the right is positive. The cart reaches a...
Tuesday, January 28, 2014 at 11:13am

physics
A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 10.0 kg cart is moving at 3.0 m/s afterward. How fast is the 15 kg cart moving
Tuesday, January 28, 2014 at 10:48am

physics 1
The left ventricle of the heart accelerates blood from rest to a velocity of + 24.8 cm/s. (a) If the displacement of the blood during the acceleration is + 2.97 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity?
Tuesday, January 28, 2014 at 10:40am

physics
A 257kg motor cycle and rider accelerate from rest and reach a velocity of 20 meters per second west. The motor cycle wheels exert an average force 710N east of the road.Explain how the force directed east causes the motorcycle to accelerate west
Tuesday, January 28, 2014 at 10:30am

physics
Does an solid expand or contract as the temperature rises?
Tuesday, January 28, 2014 at 10:14am

Physics
An inclined plane is used to raise a 100 kg box to a height of 5 m. How long must the inclined plane be if a force of 250 N is used to push the box up the inclined plane?
Tuesday, January 28, 2014 at 10:01am

physics
1. Where does sound travel fastest? water, salt water, steel, or wood 2. Does sound travel faster in salt water than water?
Tuesday, January 28, 2014 at 9:59am

physics
calculate the mass of air in a room measuring 5m*8m*10m if the density of air is 1.3kg/m cube
Tuesday, January 28, 2014 at 8:24am

Physics 2
2 spheres of equal diameters have a positive 15 micro column and negative 10 micro column charge if they are place 5 cm apart what would be the force of attraction between them.
Tuesday, January 28, 2014 at 6:40am

Physics Help
You're driving at 39km/h , when the traffic light 25m away turns yellow. I need to find the constant acceleration required to stop at the light, the stopping time, and weather the acceleration is reasonable. I know how to find the average and instantaneous acceleration, ...
Tuesday, January 28, 2014 at 12:54am

Physics
A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. On the way down it passes near an observer (sitting in a 22.5-m-high tower) who sees the rocket traveling at a speed of 37.9 m/s and moving in a vertical plane at an angle of 50.8&...
Tuesday, January 28, 2014 at 12:00am

Physics
A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto ...
Monday, January 27, 2014 at 10:40pm

Physics
A train moving at a constant speed of 61.0 km/h moves east for 35.0 min, then in a direction 50.0° east of due north for 10.0 min, and then west for 49.0 min. What is the average velocity of the train during this run? What is the magnitude of that velocity? What is the ...
Monday, January 27, 2014 at 10:39pm

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