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April 27, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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

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

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