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April 1, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
with what velocity must a ball be thrown in order to achieve the height of 50 ft.? and how long will it stay in the air?
Tuesday, February 17, 2015 at 8:14pm

Physics
Sound of a certain wavelength is coming from within a room and passing through a rectangular door (a "slit"). If the width of the doorway is twice the wavelength of the sound, what is the diffraction angle è of the sound leaving the doorway? Please show me how...
Tuesday, February 17, 2015 at 7:46pm

physics
A fire helicopter carries a 664 kg bucket of water at the end of a 24.9 m long cable. Flying back from a fire at a constant speed of 44.2 m/s, the cable makes an angle of 41.6o with respect to the vertical. Determine the force of air resistance on the bucket.
Tuesday, February 17, 2015 at 7:12pm

physics
Two blocks are connected by a lightweight cord that passes over a frictionless, massless pulley. The bottom block has a mass of 2.00 kg and the top block has mass 0.500 kg. The coefficient of kinetic friction at each sliding surface is equal to 0.10. The two blocks are release...
Tuesday, February 17, 2015 at 6:45pm

physics
43. A block of mass 2.00 kg rests on a ramp tilted at 25.0°. Coefficients of friction for the block/ramp: μs = 0.300, μk = 0.100. A string passing over a high quality pulley connects the block with a bucket as shown below. The bucket contains sand but a hole is ...
Tuesday, February 17, 2015 at 6:44pm

physics
38. A rock of mass 0.400 kg is released from the surface and sinks in the ocean. As the rock descends it is acted upon by three forces: gravity, buoyancy, and drag. The buoyancy is an upward force equal to half its weight. Drag from the water can be modeled by F = kv, where k...
Tuesday, February 17, 2015 at 6:43pm

physics
21. A traffic signal of mass 25.0 kg is suspended by two cables as shown in the diagram below. Solve for the tension in each cable each of the following scenarios: (a) θ1 = θ2 = 20.0°, and (b) θ1 = 20.0°, θ2 = 30.0°.
Tuesday, February 17, 2015 at 6:42pm

Physics
how does the value of V relate to V1 and V2?
Tuesday, February 17, 2015 at 6:08pm

physics
Toby is jogging at a constant speed of 3 m/s along a winding path. He is accelerating even though he is going at a constant speed. how is this possible? please help..
Tuesday, February 17, 2015 at 6:04pm

Physics
A contestant in a winter games event pushes a 59.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. The block is being pushed at a direction of 23 degrees below the ...
Tuesday, February 17, 2015 at 5:06pm

physics
A string under a tension of 59.0 N is used to whirl a rock in a horizontal circle of radius 2.55 m at a speed of 20.0 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string on the table is 1.00 m...
Tuesday, February 17, 2015 at 4:04pm

Chemistry and physics
What causes a red glow when the iron and sulphur mixture is heated?
Tuesday, February 17, 2015 at 1:30pm

physics
An object 5 cm high is placed at a distance of 60 cm in front of a concane mirror of focal length10cm .Find the position and size of image
Tuesday, February 17, 2015 at 1:17pm

Physics
suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be?
Tuesday, February 17, 2015 at 12:48pm

Physics
I'm having trouble finding the speed to the problem. My book isn't helping much either. A golfer hits a shot to a green that is elevated 2.50 m above the point where the ball is struck. The ball leaves the club at a speed of 18.7 m/s at an angle of 51.0˚ above the...
Tuesday, February 17, 2015 at 12:36pm

physics SOS
a 62.8 kg astronaut is floating toawrd the front of her ship at .16 m/s relative to the ship. she wishes to throw away the 2.9 kg book she was carrying. what should the speed of the book be to achive her goal?
Tuesday, February 17, 2015 at 8:57am

physics
An object travels at 5.00 m/s in the +x direction and 4.00 m/s in the +y direction. What is the magnitude of its velocity?
Tuesday, February 17, 2015 at 6:23am

physics
An object has a velocity of 5.00 m/s at an angle of 30.0˚ north of east. If we define east as the +x direction and north as the +y direction, what is the magnitude of vy?
Tuesday, February 17, 2015 at 6:13am

physics
A person walks 4.0 miles east and then makes a 50° turn to the right and walks another 2.0 miles. How far is she from her starting point?
Tuesday, February 17, 2015 at 5:04am

Physics
In a hydroelectric installation, a turbine delivers 1500 hp to a generator, which in turn transfers 80.0% of the mechanical energy out by electrical transmission. Under these conditions, what current does the generator deliver at a terminal potential difference of 1910 V?
Monday, February 16, 2015 at 11:03pm

Physics
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.2 V when it is delivering 26.0 W of power to an external load resistor R. (a) What is the value of R? (b) What is the internal resistance of the battery?
Monday, February 16, 2015 at 10:30pm

physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled.
Monday, February 16, 2015 at 8:36pm

physics
this website sucks--- try posting solutions to the questions that are asked or stop calling your site homework help
Monday, February 16, 2015 at 8:07pm

Physics 2
Using the diagram to the left, rank each of the given paths on the basis of the change in electric potential. Rank the largest-magnitude positive change (increase in electric potential) as largest and the largest-magnitude negative change (decrease in electric potential) as ...
Monday, February 16, 2015 at 7:06pm

Physics
The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.550mg is then applied at upward angle = 19°. (a) What is the magnitude of the acceleration of the block across the floor if the friction coefficients are μs = 0.595 ...
Monday, February 16, 2015 at 5:28pm

physics
A woman with mass of 63 kg stands at the rim of a horizontal table having a moment of inertia of 520 kg m2 and a radius of 1.5 m. The turntable is initially at rest and is free to rotate about a frictionless, vertical axis through its center. The woman then starts walking ...
Monday, February 16, 2015 at 5:06pm

physics
A charge of +355 μC is fixed at the center of a square that is 0.64 m on a side. How much work is done by the electric force as a charge of +7.9 μC is moved from one corner of the square to any other empty corner?
Monday, February 16, 2015 at 2:38pm

physics
A police officer investigating an accident estimates that a moving car hit a stationary car at 24km/h . If the moving car left skid marks 45m long, and if the coefficient of kinetic friction is 0.71, what was the initial speed of the moving car? Express your answer using two ...
Monday, February 16, 2015 at 2:28pm

physics
Starting from rest, a skier slides 100 m down a 28 ∘ slope. How much longer does the run take if the coefficient of kinetic friction is 0.17 instead of 0? Express your answer using two significant figures.
Monday, February 16, 2015 at 2:28pm

physics
The handle of a 27kg lawnmower makes a 36∘ angle with the horizontal. If the coefficient of friction between lawnmower and ground is 0.66, what magnitude of force, applied in the direction of the handle, is required to push the mower at constant velocity? Express your ...
Monday, February 16, 2015 at 2:28pm

physics
A skier of mass m = 55kg glides down a slope at angle theta = 32∘, as shown in the figure below. The snow is so slippery that you can neglect friction. Find the skier's acceleration. Express your answer using two significant figures. Find the force the snow exerts on...
Monday, February 16, 2015 at 2:27pm

physics
Children sled down a 44m -long hill inclined at 27∘ . At the bottom, the slope levels out. If the coefficient of friction is 0.11, how far do the children slide on the level ground? Express your answer using two significant figures.
Monday, February 16, 2015 at 2:26pm

Physics
Assume the distance axis is linear and da = 10.0m and db = 35.0 m. Estimate the work done by a force F in moving a 2.80 kg object from da to db.
Monday, February 16, 2015 at 1:49pm

Physics
One 3.30 kg paint bucket is hanging by a massless cord from another 3.30 kg paint bucket, also hanging by a massless cord, as shown in figure below. If the two buckets are pulled upward with an acceleration of 1.57 m/s by the upper cord, calculate the tension in the lower cord...
Monday, February 16, 2015 at 11:08am

Physics
A Gun of Mass 3.5kg fires a bullet at 320m/s. If the gun recoils with a speed of 24m/s, calculate the mass of the bullet.
Monday, February 16, 2015 at 10:47am

Physics
Express the angular velocity of 36 rpm (revolutions per minute) in units of radians per second (rad/s).
Monday, February 16, 2015 at 10:32am

physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 5 rotations in 20.7 seconds when twirled. 1)Calculate the centripetal acceleration of the wooden block: 2)Calculate the tension in the string acting on the ...
Monday, February 16, 2015 at 10:31am

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled. a)What is the block's tangential (linear) speed? b)What is the block's angular speed?
Monday, February 16, 2015 at 10:30am

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled.
Monday, February 16, 2015 at 10:18am

physics
a solid X, insoluble in water, weighs 180g in air and 150g in water. what is the relative density of the solid X? it is the physics question.
Monday, February 16, 2015 at 10:06am

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 12 rotations in 20.7 seconds when twirled. Calculate the centripetal acceleration of the wooden block: Calculate the tension in the string acting on the ...
Monday, February 16, 2015 at 9:26am

Physics
A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 8 rotations in 20.7 seconds when twirled. What is the block's tangential (linear) speed? What is the block's angular speed?
Monday, February 16, 2015 at 9:24am

physics
Two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
Monday, February 16, 2015 at 8:05am

physics
a student wants to determine the coefficient of static friction and kinetic friction between a box and a plank by gradually raising one end of the plank. when the angle of inclination with the horizontal reaches 28.0, the box starts to slip and slide 2.53 m down the plank in 3...
Monday, February 16, 2015 at 7:10am

physics
A water (H2O) molecule consists of two hydrogen atoms and one oxygen atom. The oxygen atom is located at the origin. One hydrogen atom is between the positive x-axis and positive y-axis and the other hydrogen atom is between the negative x-axis and the positive y-axis. Each ...
Monday, February 16, 2015 at 7:01am

Physics
Calculate the acceleration of a plane when it changes its speed from 0m/s to 250m/s in 12 seconds
Monday, February 16, 2015 at 6:58am

Physics
Angelito wanted to lose weight by dieting and exercising. One day, he only had a loaf of bread with an energy content of 2.50 x 10^5 J for his breakfast. To exercise, he lifted a 28.34kg to a height of 0.5m. How many times must he lift and lower the barbell to burn 1.25 x 10^4 J?
Monday, February 16, 2015 at 4:17am

physics
An unknown object with mass M slides on a smooth frictionless surface with a speed of 35.0 m/s along the x-axis. Suddenly it explodes into two pieces, P and Q, which move in different directions as shown in the figure below. Determine the final velocity of both fragments if ...
Monday, February 16, 2015 at 2:32am

physics
A hockey puck of mass m = 120 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 0.50 m. Tied to the other end of the string, and hanging vertically beneath the table, is ...
Monday, February 16, 2015 at 12:56am

physics
The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 7.0 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 3.3 m from ...
Monday, February 16, 2015 at 12:42am

physics
Two objects, with masses m1 and m2, are originally a distance r apart. The gravitational force between them has a magnitude F. The second object has its mass changed to 4m2, and the distance is changed to r/7. What is the ratio between the magnitude of the new gravitational ...
Monday, February 16, 2015 at 12:33am

physics
When you lift a bowling ball with a force of 60.7 N, the ball accelerates upward with an acceleration a. If you lift with a force of 69.3 N, the ball's acceleration is 1.99a. Calculate the weight of the bowling ball.
Sunday, February 15, 2015 at 11:25pm

Physics
A simple pendulum has mass 1.14 kg and length 0.760 m. (a) What is the period of the pendulum near the surface of Earth? (b) If the same mass is attached to a spring, what spring constant would result in the period of motion found in part (a)?
Sunday, February 15, 2015 at 10:43pm

Physics 1
Monique has a mass of 46 kg and she is sitting on a swing that hangs 0.50 m above the ground. Pierre pulls the swing back and releases it when the seat is 1.40 m above the ground. How fast is Monique moving when the swing passes through its lowest point? The answer is 4.2m/s, ...
Sunday, February 15, 2015 at 8:34pm

Physics (BioPhysics)
You are bending your upper body forward, while your legs remain perfectly straight and their center of gravity remains over the back of your feet (see cartoon below). What is the maximum angle  you can lean forward by without tipping over? Assume that your upper body ...
Sunday, February 15, 2015 at 7:48pm

Physics Circular Motion
What is the maximum speed for a car to safely negotiate a 30 banked curve of 60 m radius if there is a coefficient of static friction of 0.35?
Sunday, February 15, 2015 at 7:32pm

Physics Circular Motion
A 0.75-kg ball is attached to a 1.0-m rope and whirled in a vertical circle. The rope will break when the tension exceeds 450 N. What is the maximum speed the ball can have at the bottom of the circle without breaking the rope?
Sunday, February 15, 2015 at 7:31pm

Physics Circular Motion
A satellite in orbit around the earth has a period of one hour. An identical satellite is placed in an orbit having a radius that is nine times larger than that of the first satellite. What is the period of the second satellite?
Sunday, February 15, 2015 at 7:31pm

Physics
What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.82m tall person standing vertically?
Sunday, February 15, 2015 at 6:42pm

physics
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 7.87 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Sunday, February 15, 2015 at 6:19pm

Physics- Momentum
A 170g cue ball is moving at 3.0 m/s when it strikes a 160g stationary numbered ball (object ball). After the collision the balls move off as shown. Determine the speed of the cue ball and the numbered (object) ball after the collision. The diagram illustrates the cue ball ...
Sunday, February 15, 2015 at 5:01pm

physics
What average force is required to stop a 920kg car in 7.7s if the car is traveling at 83km/h ?
Sunday, February 15, 2015 at 4:33pm

Physics
A slide loving pig slides down a certain 21° slide in four times the time it would take to slide down a frictionless 21° slide. What is the coefficient of kinetic friction between the pig and the slide?
Sunday, February 15, 2015 at 3:40pm

Physics
A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 29.8° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.400 and 0.320, respectively. The box slides down unless the...
Sunday, February 15, 2015 at 3:26pm

Physics
You are given a vector in the xy plane that has a magnitude of 85.0 units and a y component of -40.0 units
Sunday, February 15, 2015 at 3:25pm

physics
Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
Sunday, February 15, 2015 at 2:31pm

physics
As a protest against the umpire’s calls, a baseball pitcher throws a ball straight up into the air at a speed of 20.4 m/s. In the process, he moves his hand through a distance of 1.57 m. The acceleration of gravity is 9.8 m/s 2 . If the ball has a mass of 0.147 kg, find ...
Sunday, February 15, 2015 at 12:09pm

Physics
Two boys,each of mass m,are standing at the back of a flatbed trolley of mass 4m.the trolley is at rest on a frictionless horizontal surface.The boys jump off simultaneously at one of end of the trolley whith a horizontal velocity of 2m's.the trolley moves in the opposte ...
Sunday, February 15, 2015 at 9:15am

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

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