Friday
May 29, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
The tortoise and the hare agree to a race. Of course, they are racing cars, having gotten tired of racing on foot. The tortoise, having just bought a new Mercedes AMG GT, allows the hare to have a running start in his Volkswagen Rabbit. The hare starts the race by getting up ...
Sunday, February 15, 2015 at 8:51am

physics
A sprinter in a race can run 100m in 11.4 seconds. If it takes him 4.2 seconds to accelerate to top speed, what is the magnitude of his acceleration? Assume that he stays at his top speed from 4.2 seconds till the end. I do not understand which kinematics equation will help, ...
Sunday, February 15, 2015 at 8:50am

physics
A sledge weighing 30 kg is pulled with a rope that makes 60° with the horizontal. The tension on the rope is constant and it is 37N. The sledge is moved horizontally for 13 m. There is no friction and cos(60°)=0.5 a) What is the work done by the tension on the sledge ...
Sunday, February 15, 2015 at 8:25am

Physics
Calculate the components parallel and perpendicular to the plane of 150N gravitational force acting on an object on a slope at 20 degrees to the horizontal ?
Sunday, February 15, 2015 at 4:48am

Physics
Calculate the horizontal and vertical components of a 280 N force pulling upwards at an angle of 33 degrees to the horizontal ?
Sunday, February 15, 2015 at 4:01am

Physics
A particle moving along the x-axis has its velocity described by the function v =2t squared m/s, where t is in s. Its initial position is x = 2.8m at t = 0 s. At 2.7s , what is the particle's position?
Saturday, February 14, 2015 at 7:34pm

physics
Galileo's first telescope used a convex objective lens with a focal length f = 1.65 m and a concave eyepiece. When this telescope is focused on an infinitely distant object, and produces an infinitely distant image, its angular magnification is +3.11. What is the focal ...
Saturday, February 14, 2015 at 7:30pm

physics
Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One method uses a second, convex, lens to produce a virtual object for the concave lens. Under the proper conditions, the concave lens will form a real ...
Saturday, February 14, 2015 at 7:11pm

Physics
If the rifle is stopped by the hunter’s shoulder in a distance of 3.16 cm, what is the magnitude of the average force exerted on the shoulder by the rifle? Answer in units of N. mass of bullet= 0.0137 kg velocity of bullet= 546 m/s to the right mass of rifle= 3.82 kg ...
Saturday, February 14, 2015 at 3:18pm

Physics
Two objects of same material are travelling near you. Object A is a 1.5 kg mass traveling 13.5 m/s; object B is a 2 kg mass traveling 5 m/s. Which object would make you feel worse if you are hit by it? 1. B 2. A 3. Unable to determine 4. the same
Saturday, February 14, 2015 at 2:17pm

Physics
A car and driver weighing 7740 N passes a sign stating “Bridge Out 27.7 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 12.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done stopping the car if ...
Saturday, February 14, 2015 at 2:09pm

Physics
How does the energy stored in a capacitor change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, as the capacitor remains connected to a battery?
Saturday, February 14, 2015 at 1:33pm

physics
A batted baseball leaves the bat at an angle of 33.0∘ above the horizontal and is caught by an outfielder 380ft from home plate at the same height from which it left the bat. 1. What was the initial speed of the ball? 2. How high does the ball rise above the point where ...
Saturday, February 14, 2015 at 12:13pm

Physics
An airplane is travelling from Vancouver to Toronto following the jet stream. The plane cruised at an average speed of 1100 km/h for the 4000 km flight. How long did the flight take? If the plane left Vancouver at 3:00 am EST, what time did it arrive in Toronto? please show ...
Saturday, February 14, 2015 at 1:47am

physics
Three charged marbles are glued to a nonconducting surface and are placed in the diagram as shown. The charges of each marble are q1 = 5.75 µC, q2 = 1.48 µC, and q3 = −2.47 µC. Marble q1 is a distance r1 = 3.00 cm to the left of the marble q2, while ...
Friday, February 13, 2015 at 11:05pm

Physics
How does the energy stored in a capacitor change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, as the capacitor remains connected to a battery?
Friday, February 13, 2015 at 9:58pm

Physics
Emmy kicks a soccer ball up at an angle of 45° over a level field. She watches the ball\'s trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. Assume that air resistance is negligable, and plot the horizontal and ...
Friday, February 13, 2015 at 8:07pm

Physics
A speedboat moves on a lake with initial velocity vector v1,x = 8.57 m/s and v1,y = -2.61 m/s, then accelerates for 6.67 seconds at an average acceleration of aav,x = -0.105 m/s2 and aav,y = 0.101 m/s2. What are the components of the speedboat\'s final velocity, v2,x and ...
Friday, February 13, 2015 at 8:07pm

Physics
The top of the pool table is 0.770 m from the floor. The placement of the tape is such that 0 m is aligned with the edge of the table (as shown). The winner of the competition wants to know if he has broken the world record for the break shot of 32 mph (about 14.3 m/s). If ...
Friday, February 13, 2015 at 8:06pm

Physics
Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...
Friday, February 13, 2015 at 8:04pm

Physics
What is the final equilibrium temperature when 5 g of milk at 13â—¦C is added to 161 g of coffee at 81â—¦C? Assume the specific heats of milk and coffee are the same as that of water, and neglect the specific heat of the container. Answer in...
Friday, February 13, 2015 at 6:39pm

Physics
It takes 133 J of work to move 3 C of charge from the negative plate to the positive plate of a parallel plate capacitor. What voltage difference exists between the plates? Answer in units of V.
Friday, February 13, 2015 at 6:27pm

Physics
The potential difference between a storm cloud and the ground is 2.13 × 108 V. If a bolt carrying 2 C falls from a cloud to Earth, what is the magnitude of the change of potential energy of the charge? Answer in units of J.
Friday, February 13, 2015 at 6:26pm

Physics
Calculate the flow rate of blood (of density 1.03 g/cm3) in an aorta with a cross-sectional area of 2.88 cm2 if the flow speed is 28.5 cm/s. Answer in units of g/s.
Friday, February 13, 2015 at 5:18pm

Physics
While rearranging a dorm room, a student does 312 J of work in moving a desk 2.0 m. What was the magnitude of the applied horizontal force?
Friday, February 13, 2015 at 4:25pm

physics
if a 400g ball moving 1.2 m/s [north], receives an impulse that changes its direction and speed to 2.8 m/s [east], what is the change of momentum?
Friday, February 13, 2015 at 2:54pm

physics
a regulation golf ball has a mass of 45.0 grams. a golf ball is dropped from a height of .305 m and it strikes the floor with a velocity of 2.35 m/s [down]. if the velocity of the ball as it leaves the floor is 2.15 m/s [up]. determine the impulse applied to the golf ball.
Friday, February 13, 2015 at 2:44pm

Physics
A chandelier with mass m is attached to the ceiling of a large concert hall by two cables. Because the ceiling is covered with intricate architectural decorations (not indicated in the figure, which uses a humbler depiction), the workers who hung the chandelier couldn't ...
Friday, February 13, 2015 at 12:54pm

Physics Honors
A 47.0 g golf ball is driven from the tee with an initial speed of 48.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 8.0 m below its highest point?
Friday, February 13, 2015 at 12:30pm

Physics Honors
A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 1.90 m above the floor with a speed of 7.40 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.40 m/s. What is the work done on the ball by air resistance, a ...
Friday, February 13, 2015 at 12:29pm

physics
How fast do you need to swing a 180-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 35∘ angle relative to the horizontal?
Friday, February 13, 2015 at 11:52am

physics
what will be the young's modulus of copper wire pf length 0.15 m and radius 0.2 cm
Friday, February 13, 2015 at 5:46am

physics
Stone dropped from top of a tower 100m high. At same instant another stone is thrown vertically from base of the tower with a velocity of 25m/s. When and where will the two stones meet? Given g =10 m/s^2
Friday, February 13, 2015 at 3:03am

physics
Stone dropped from top of a tower 100m high. At same instant another stone is thrown vertically from base of the tower with a velocity of 25m/s. When and where will the two stones meet? Given g =10 m/s^2
Friday, February 13, 2015 at 3:01am

physics
In driving the usual route to school, a student computes his average speed to be 26 km/h. In a hurry to get home that afternoon, he wants to average 30 km/h for the round trip. What would his average speed for the return trip over the same route have to be in order to do this?
Friday, February 13, 2015 at 2:05am

physics
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 67.3 N, Jill pulls with 98.7 N in the northeast direction, and Jane pulls to the southeast with 133 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
Friday, February 13, 2015 at 1:48am

physics
What angle might give you the greatest height? How could you test this with a simulation that does not go off the page? What angle might give you the greatest distance? How could you test this with a simulation that does not go off the page? What angle will give you minimum ...
Friday, February 13, 2015 at 1:03am

physics
the velocity time graph of a car start from rest and it accelerate uniformly at a rate 3m/s2 for 5seonds if attain the velocity which maintain for 1m the car then brought to rest by a uniform retardation after another 30m. draw the velocity time graph. find the acceleration. ...
Thursday, February 12, 2015 at 11:54pm

Physics
Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)
Thursday, February 12, 2015 at 11:43pm

Physics
Two people are holding up the ends of a 4.40-kg wooden board that is l = 1.95 m long. A m = 2.00-kg box sits on the board, 0.50 m from one end, as shown below. What forces do the two people exert?
Thursday, February 12, 2015 at 10:53pm

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 100 s per increment, and the scale for the velocity axis is 330 m/s per ...
Thursday, February 12, 2015 at 10:25pm

physics
A 3.6 kg rock is initially at rest at the top of a cliff. Assume that the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water. How high is the cliff if the temperature of 1.1 kg of water is raised ...
Thursday, February 12, 2015 at 10:04pm

physics
A light, rigid rod l = 5.55 m in length rotates in the xy plane about a pivot through the rod’s center. Two particles of masses m1 = 9.8 kg and m2 = 2.4 kg are connected to its ends find the moment of inertia
Thursday, February 12, 2015 at 9:34pm

physics
A student holds two lead weights, each of mass 12 kg. When the students’ arms are extended horizontally, the lead weights are 0.82 m from the axis of rotation and the student rotates with an angular speed of 1.5 rad/sec. The moment of inertia of student plus stool is 5.5 ...
Thursday, February 12, 2015 at 9:25pm

physics
while rowing in a race, john uses his arms to exert a force of 165 N per stroke while pulling the .80 m. how much work does he do in 30 stroke?
Thursday, February 12, 2015 at 9:20pm

physics
A light, rigid rod l = 5.55 m in length rotates in the xy plane about a pivot through the rod’s center. Two particles of masses m1 = 9.8 kg and m2 = 2.4 kg are connected to its ends. Determine the angular momentum of the system about the origin at the instant the speed of...
Thursday, February 12, 2015 at 9:16pm

Physics
How does the energy stored in a capacitor change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, as the capacitor remains connected to a battery? Does the stored energy go up by a factor of 4 for both A and B?
Thursday, February 12, 2015 at 8:57pm

Physics Dynamics
A sled of mass m = 70.0 kg is being pulled horizontally on a frictionless floor by a force F = 420 N that makes an angle 20.0o above the horizontal. What is the magnitude of the normal force applied by the ground on the sled?
Thursday, February 12, 2015 at 8:09pm

Physics Dynamics
A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.69 of the person's regular weight. Calculate the magnitude of the acceleration of the elevator.
Thursday, February 12, 2015 at 8:08pm

Physics Dynamics
A child slides down a slide with a 24o incline, and at the bottom her speed is precisely one-third what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child.
Thursday, February 12, 2015 at 8:08pm

Physics Dynamics
An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
Thursday, February 12, 2015 at 8:08pm

Physics Dynamics
Swimming at 2.00 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 35 m downstream from the point directly across the river from his starting point. (a) What is the speed of the current in the river? (b) At what angle relative to ...
Thursday, February 12, 2015 at 8:07pm

Physics
You are hitting a tennis ball against a wall. The 0.057-kg tennis ball traveling at 29 m/s strikes the wall and rebounds at the same speed. Earth is the object of reference. Determine the ball's change in momentum (magnitude).
Thursday, February 12, 2015 at 6:55pm

Physics
An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 85kg ball swings from a 20-m-long wire at speed 10m/s as the wire passes the vertical orientation. What tension force must the wire be able to withstand in order not to break? ...
Thursday, February 12, 2015 at 6:53pm

Physics
The two angled ropes used to support the crate in (Figure 1) can withstand a maximum tension of 1700N before they break. What is the largest mass the ropes can support? The two angles given are 30 degrees and 45 degrees.
Thursday, February 12, 2015 at 6:04pm

physics
an object is projected with a velocity of 10m/s from the ground level at an angle to the vertically, the total time of flight of projectile os 10secs. calculate angle when (g=10m/s) show workings
Thursday, February 12, 2015 at 5:44pm

physics
A warehouse worker pushes a crate along the floor, as shown in the figure (Figure 1) , by a force of 9.0N that points downward at an angle of 45∘ below the horizontal. Q1 Find the horizontal component of the push Q2 Find the vertical component of the push.
Thursday, February 12, 2015 at 5:27pm

Physics
Initial velocity is 21 m/s, the angle is 40 degrees, 20 meters away from the wall. How long is the ball in the air for?
Thursday, February 12, 2015 at 4:59pm

Physics
From her bedroom window a girl drops a water-filled balloon to the ground, 6.9 m below. If the balloon is released from rest, how long is it in the air?
Thursday, February 12, 2015 at 4:53pm

Physics
A skier moves 100.0 m horizontally, and then travels another 35.0 m uphill at an angle of 35.0º above the horizontal. What is the skier's displacement from his starting point?
Thursday, February 12, 2015 at 4:46pm

Physics
A spaceship in deep space has a velocity of 4000 km/s and an acceleration in the forward direction of 6 m/s2. What is the acceleration of a ball relative to the spaceship after it is released in this spaceship?
Thursday, February 12, 2015 at 4:02pm

physics
An object is placed in front of a concave mirror, 16.0 cm from the mirror's focal point. The image formed by the mirror is two times farther away from the focal point. Calculate the focal length of the mirror. There are actually two possible image distances di that satisfy...
Thursday, February 12, 2015 at 2:57pm

Physics
What is the maximum total force exerted on a 71 kg astronaut by her seat during the launch of the Space Shuttle?
Thursday, February 12, 2015 at 1:59pm

Physics
When man stands on a bathroom scale here on Earth, it reads 560N . Assume each planet to be a perfect sphere with the following parameters. What would his mass be on Mars if Mars has a mass of 6.419 x 10^23 kg and a radius of 3.396 x10^6 m? and what is the magnitude of the ...
Thursday, February 12, 2015 at 12:04pm

college physics 1
As part of a fundraiser, the Chancellor has agreed to bungee jump from a crane 45 m above a pool filled with Jello. The plan is for the bungee cord to stop the Chancellor just before his head enters the Jello. Your task is to select a bungee cord that will safely stop the ...
Thursday, February 12, 2015 at 9:21am

fristyear physics
two girls a and b weighting 40 and 30 kg both of them pull 14m held by them.they will meet when covers a distance of?
Thursday, February 12, 2015 at 6:15am

physics
a man raises a mass,m to a height ,h and then shifts it horizontally over a distance ,x. find the total work done against the force of gravity?
Thursday, February 12, 2015 at 3:22am

physics
A frictionless incline is 5.00 m long (the distance from the top of the incline to the bottom, measured along the incline). The vertical distance from the top of the incline to the bottom is 4.03 m. A small block is released from rest at the top of the incline and slides down ...
Thursday, February 12, 2015 at 1:25am

physics
What happens if we use water instead of kerosene in joules calorimeter experiment
Thursday, February 12, 2015 at 1:22am

Physics
How fast do you need to swing a 190-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 30 degree angle relative to the horizontal?
Thursday, February 12, 2015 at 12:42am

Physics
Two identical resistors are connected in parallel across a 26-V battery, which supplies them with a total power of 9.8 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains unchanged...
Thursday, February 12, 2015 at 12:14am

physics
A 14-Ω loudspeaker, a 9.0-Ω loudspeaker, and a 3.2-Ω loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers, assuming that they all behave as resistors. Answer: (1/14)+(1/9)+(1/3.2...
Thursday, February 12, 2015 at 12:05am

Physics
a BALL IS THROWN UPWARD WITH AN INITIAL VELOCITY OF 9.8 M/S FROM THE TOP OF A BUILDING. FILL A TABLE BELOW SHOWING THE BALLS POSITION,VELOCITY, and ACCELERATION AT THE END OF EACH OF THE 1ST 4SEC OF MOTION TIME(s) POSITION(M) VELOCITY(M/S) 1 2 3 4 Acceleration (M?S^2) Fill in ...
Wednesday, February 11, 2015 at 11:48pm

Physics
During a rElay race along a straight ROAD the 1st runner on a three person team runs D1 with a constant velocity v1. The runner then hands off the baton to the sEcond runner who runs d2 with a constant vElocity v2. The batton is then passed to the 3rd runner who completes the ...
Wednesday, February 11, 2015 at 11:36pm

Physics
The rms current in a 41-Ω resistor is 0.69 A. What is the peak value of the voltage across this resistor? Answer: V(rms) = A(ohms)(sqrt2)
Wednesday, February 11, 2015 at 11:24pm

Physics
Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)
Wednesday, February 11, 2015 at 11:05pm

physics
A box of mass 26 kg is hung by a thin string from the ceiling of an elevator. The string can hold up to 276.1 N and will break under larger tension force. How much can the maximum acceleration of the elevator be going upward so that the string does not break and continues to ...
Wednesday, February 11, 2015 at 10:40pm

physics
A man named Harold is standing in a train car that has no windows. Since there aren't any windows, he doesn't know how fast or in what direction the train is moving or whether it is accelerating or decelerating. Harold decides that he might be able to figure something ...
Wednesday, February 11, 2015 at 9:47pm

Physics
How fast do you need to swing a 180-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 35∘ angle relative to the horizontal?
Wednesday, February 11, 2015 at 9:25pm

Physics-Electricity
A toaster consists of 4 heating elements that are connected in parallel. The toaster is connected to a 240 V mains supply. When the toaster is switched on, a current of 2.5 A is drawn from the mains supply. Calculate the electrical energy used by a single heating element in ...
Wednesday, February 11, 2015 at 8:33pm

Physics
If the drive chain exerts a force of 2090 N at a radius of 5.00 cm, what is the angular acceleration of the wheel? (b) What is the tangential acceleration of a point on the outer edge of the tire? (c) How long, starting from rest, does it take to reach an angular velocity of ...
Wednesday, February 11, 2015 at 8:29pm

physics
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 0.0070m/s2 less than that at sea level (gsealevel = 9.83 m/s2). What is the observatory's altitude? Assume Rearth = 6.37 × 106 m.
Wednesday, February 11, 2015 at 8:29pm

physics
A cylindrical 9.16 kg pulley with a radius of 0.373 m is used to lower a 2.64 kg bucket into a well. The bucket starts from rest and falls for 3.94 s. What is the linear acceleration of the falling bucket? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s 2
Wednesday, February 11, 2015 at 7:58pm

Physics
The best sprinters can run a 100 m in 10.0 s. A 77.2 kg sprinter accelerates uniformly for the first 51.0 m to reach top speed, which he maintains for the remaining 49.0 m. What is the average horizontal component of force exerted on his feet by the ground during acceleration...
Wednesday, February 11, 2015 at 7:56pm

Physics
You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of F = (202i − 161k) N to try and move the 75.0-kg refrigerator. The coefficient of static friction is 0.640. a) how much static friction force does the floor exert on the ...
Wednesday, February 11, 2015 at 7:46pm

Physics
A spring with a spring constant of 40.1 N/m is attached to different masses, and the system is set in motion. What is its period for a mass of 2.8 kg?
Wednesday, February 11, 2015 at 7:08pm

Physics
Cleveland is 480 km east of Chicago. A plane leaves Chicago with an air speed of 800km/h in a wind which blows [S 45 degrees W]. (A) what heading will the pilot take in order to fly with a ground speed which is directly east? (B) how long will it take to get to Cleveland?
Wednesday, February 11, 2015 at 6:55pm

Physics
A cannon ball is fired horizontally with an initial speed of 75 m/s from the top of a 50-m tall building. When the ball hits the ground, its velocity vector makes an angle θ with the horizontal. What is θ
Wednesday, February 11, 2015 at 6:28pm

Physics
A baseball player slides into third base with an initial speed of 3.8m/s. If the coefficient of kinetic friction between the player and the ground is 0.40, how far does the player slide before coming to rest?
Wednesday, February 11, 2015 at 6:28pm

physics
a tsunami originating in japan has a wavelength of 10^5 m and a period of 10 mins. how long does it take to travel 8000km?
Wednesday, February 11, 2015 at 6:26pm

Physics
Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.345. The objects have masses of m1 = 3.25 kg, m2 = 1.25 kg, and m3 = 2.50 kg, and the pulleys are frictionless. The Photo: w w w(dot)...
Wednesday, February 11, 2015 at 4:33pm

Physics
Why does the potential inside a solid conductor not change?
Wednesday, February 11, 2015 at 3:47pm

Physics
Does the potential inside a hollow conductor change and why?
Wednesday, February 11, 2015 at 3:46pm

Physics Help!!!!!!!!!!!!!!!!
Suppose you were asked to develop a concept of "automobile current" ( a current formed by moving cars) for traffic on an interstate or busy street near you. a) what would be the units of "automobile current"? b) what info would be the "automobile ...
Wednesday, February 11, 2015 at 2:52pm

Physics Help Please!
Suppose you work at an amusement park. Your boss has asked you to determine the "people current," a measurement of moving people coming through the entrance of the park. a) what would be the units of "people current?" b) what information would "people ...
Wednesday, February 11, 2015 at 1:04pm

Physics Help Please
Suppose you work at an amusement park. Your boss has asked you to determine the "people current," a measurement of moving people coming through the entrance of the park. a) what would be the units of "people current?" b) what information would "people ...
Wednesday, February 11, 2015 at 1:04pm

Physics
A cannon fires projectile (ordinarily called a cannonball) at an angle 85 degrees from the ground. The cannonball has a speed 150 m/s, and it is launched from hill 20 m above the plain where it will land.
Wednesday, February 11, 2015 at 11:56am

Physics
A car speeds up from 12 m/s to 20 m/s in 6.4s.If its mass is 1200 kg,what force must its engine provide ?
Wednesday, February 11, 2015 at 11:20am

PHYSICS
A variable length air column (closed on one end) is placed just below a vibrating wire of mass 5.00g, which is fixed at both ends. The length of the air column is gradually increased from zero until the first position of resonance (first harmonic) is observed at 34 cm. The ...
Wednesday, February 11, 2015 at 10:24am

physics
Two bodies have masses in ratio 3:4when a force is applied on the first body it moves with an acceleration of 6m/s2 how much acceleration will the same force produced in the body
Wednesday, February 11, 2015 at 1:23am

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