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October 25, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
a net force of 72 n is applied to a 48 kg box starting from rest for 8 s. what is the final velocity of the box? I need someone to show me how to set up. thanks
Thursday, October 16, 2014 at 7:48pm

physics
A 65 kg skateboarder is standing on a stationary .5 kg skateboard. the skateboarder steps off the a skateboard with a horizontal veolicty of 1.5 m/s. what is the recoil velocity of the skateboard ignoring friction? 
Thursday, October 16, 2014 at 7:29pm

Science-Physics
A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle that the final velocity ...
Thursday, October 16, 2014 at 7:29pm

physics
A projectile is shot from the edge of a cliff h = 285 m above ground level with an initial speed of v0 = 155 m/s at an angle of 37.0° with the horizontal. (a) Determine the time taken by the projectile to hit point P at ground level. Incorrect: Your answer is incorrect. s...
Thursday, October 16, 2014 at 7:19pm

physics
A projectile is shot from the edge of a cliff h = 125 m above ground level with an initial speed of v0 = 145 m/s at an angle of 37.0° with the horizontal. (a) Determine the time taken by the projectile to hit point P at ground level. b) Determine the range X of the ...
Thursday, October 16, 2014 at 7:17pm

Physics
A projectile is accelerated from rest at point A along a circular track of radius 2 m, as shown in Fig. 5.1. Gravity acts in the z direction. The rate at which the speed of the projectile increases as a function of time, t, is at = 2t ms-2. What is the magnitude of the ...
Thursday, October 16, 2014 at 6:49pm

Physics Help Please!!!! Urgent!!
1) A 10 kg lead brick rests on a wooden table. if a force of 46N is required to slide the brick across the table at a constant velocity, what is the coefficient of friction? 2) A horizontal force of 100N is applied to a 200 kg refrigerator sitting on a horizontal surface. the ...
Thursday, October 16, 2014 at 6:01pm

Physics
The drawing shows a skateboarder moving at 5.71 m/s along a horizontal section of a track that is slanted upward by 49.8 ° above the horizontal at its end, which is 0.516 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
Thursday, October 16, 2014 at 6:00pm

physics
When a jet lands on an aircraft carrier, a hook on the tail of the plane grabs a wire that quickly brings the plane to a halt before it overshoots the deck. In a typical landing, a jet touching down at 240 km/h is stopped in a distance of 95 m. What is the magnitude of the jet...
Thursday, October 16, 2014 at 5:26pm

Physics Help Please!!!!
A man pushes a stalled car with a horizontal force of 312 N. The car does not move. What is the frictional drag force on the car? A water-skier (mass=60kg) is pulled by a boat with a horizontal force of 300N. The boat and the skier have a constant velocity. What is the ...
Thursday, October 16, 2014 at 5:18pm

Physics
An electron in an electron beam experiences a downward force of 2.0 x 10^-14 N while traveling in a magnetic field of 8.8 x 10 ^-2 T west. The charge on a proton is 1.60×10^−19. a) What is the magnitude of the velocity? Answer in units of m/s
Thursday, October 16, 2014 at 5:04pm

Physics
A solenoid 74.5 cm long has 350 turns and a radius of 2.26 cm. If it carries a current of 1.69 A, find the magnetic field along the axis at its center. Answer in units of T
Thursday, October 16, 2014 at 3:51pm

Physics
A ball rolls without slipping down the track as shown in the figure below, starting from rest at a height h1 = 27 m as shown. The ball is traveling horizontally when it leaves the bottom of the track, which has a height h2 = 8.0 m.
Thursday, October 16, 2014 at 3:29pm

physics
A railroad flatcar is loaded with crates having a coefficient of static friction of 0.394 with the floor. If the train is moving at 57.1 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide?
Thursday, October 16, 2014 at 2:58pm

physics
1. A 100N block lies on a frictional surface. A force of 50N was applied horizontally where the block had moved 5 m from the positive direction. Find the work done by the applied force and the work done by the weight of the block. 2. Using Example 1, if the applied force is ...
Thursday, October 16, 2014 at 2:35pm

physics
5. A woman is wearing her seat belt while driving 95km/h. She finds it necessary to slam on her brakes, and she slows uniformly to a stop in 5 s. Calculate the average force exerted on her by the seat belt (neglecting friction with the seat)? Express the result as a multiple ...
Thursday, October 16, 2014 at 1:53pm

Science-Physics
A car is moving at a constant 19.3m/s, and rain is falling at 8.9 m/s straight down. What angle does the rain make with respect to the horizontally observed by the driver?
Thursday, October 16, 2014 at 11:59am

Science (Physics)
I need help with these. I'm so confused! Thanks! 1.) An F-14 Tomcat fighter jet goes from rest to a speed of 75m/s in 2.5 s. What is the acceleration? 2.) Preston tossed a red ball upward and it reaches a maximum height of 3.0m What is the final velocity when it returns to...
Thursday, October 16, 2014 at 11:56am

physics
two spherical boys float half some edge in a calm deep sea their radius a, is very much small er than their separation b, calculate the resistance between them If the resistivity of the is rho water
Thursday, October 16, 2014 at 8:59am

Physics
Two steam locomotives are approaching each other, each at 30 mi/hr, heading for a sure head-on collision. A rhinoceros beetle, who flies with a constant speed of 40 mi/hr, leaves the front of the first locomotive when the engines are just 2.000 miles apart, and flies to the ...
Wednesday, October 15, 2014 at 11:16pm

physics
A diver leaves the end of a 4.0-m-high diving board and strikes the water 1.3 s later, 3.0 m beyond the end of the board. Considering the diver as a particle, determine:
Wednesday, October 15, 2014 at 11:04pm

physics
A block of mass m = 4.20 kg slides along a horizontal table with speed v0 = 9.50 m/s. At x = 0 it hits a spring with spring constant k = 62.00 N/m and it also begins to experience a friction force. The coefficient of friction is given by μ = 0.150. How far has the spring ...
Wednesday, October 15, 2014 at 10:56pm

Physics
Please help! A young girl with mass 42.5kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 94.0kg * (m/s) . Starting at 0s , a net force with magnitude F=( 8.10N/s )*t and direction due west is applied to the ...
Wednesday, October 15, 2014 at 10:55pm

Physics
A pair of blocks of the mass M =30.7 kg, and 2 M are dragged over a rough, horizontal surface by two constant forces of magnitude F=98.0 N. The angle α = 22.7 ° . The blocks are displaced 7.5 m, and the coefficient of kinetic friction is 0.258. *for the normal force ...
Wednesday, October 15, 2014 at 10:19pm

Physics
A 4.00g bullet, traveling horizontally with a velocity of magnitude 410m/s , is fired into a wooden block with mass of 0.780kg , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 220m/s . The block slides a distance...
Wednesday, October 15, 2014 at 9:44pm

physics
A heavier mass m1 and a lighter mass m2 are 17.5 cm apart and experience a gravitational force of attraction that is 9.80 10-9 N in magnitude. The two masses have a combined value of 5.00 kg. Determine the value of each individual mass
Wednesday, October 15, 2014 at 9:12pm

Physics
A golf ball was launched at 35.0m/s at an angle of 35.0 degrees above the horizontal a) determine the horizontal and vertical components of the balls velocity b)how long was the ball in the air c) how far did the ball go d) what was the maximum height
Wednesday, October 15, 2014 at 9:12pm

Physics Help Please!!!!
During a launch of the shuttle, fuel is being burned at a rate of 2000 kg every second. the exhaust from the burning of this fuel is expelled by the engines and can be seen during the launch. readings from instruments mounted on the space shuttle show that for the first 2 min ...
Wednesday, October 15, 2014 at 8:23pm

physics... PLEASE HELP
In a particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.7 × 10 -27 kg. What is the force on the proton
Wednesday, October 15, 2014 at 8:21pm

physics
A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current flows through a square area of membrane on a side? (ii...
Wednesday, October 15, 2014 at 8:21pm

physics... PLEASE HELP
A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mm in diameter. The average power of such a laser is 0.75 mW. (i) What is the average intensity? (ii) What is the peak intensity? (iii) What is the average energy density of...
Wednesday, October 15, 2014 at 8:06pm

Physics - Second Law Question
the space shuttle engines cause an upward force of 3 x 10 ^5 N to act on the shuttle. gravity pulls down on the shuttle with a force of 1.96 x 10^5 N. what is the net force on the shuttle? what is the direction of the net force?
Wednesday, October 15, 2014 at 8:05pm

Physics - Second Law Question
A large raindrop falling a cloud is acted on by a gravitational force of 4.9 x 10^-3 N directed downward and a force of air resistance of 4.5 x 10^-3 N directed upward. What is the net force on the raindrop? What is the direction of the net force? Thank you so much!
Wednesday, October 15, 2014 at 8:03pm

Physics
Does potential energy equal to kinetic energy within the limits of experimental error?
Wednesday, October 15, 2014 at 8:01pm

Physics Help Please!!!! Urgent!!
In an experiment, a boar (2600 kg) slows down from 11 m/s to 8 m/s in 5 sec when the engine is stopped. a) Determine the drag force. b) Using this information, what is a good approximation of the forward thrust force needed to keep the boat cruising at a constant speed of 9 to...
Wednesday, October 15, 2014 at 8:01pm

physics
A typical cell membrane is 8.0 nm thick and has an electrical resistivity of 1.3 × 107Ω.m. (i) If the potential difference between the inner and outer surfaces of a cell membrane is 75 mV, how much current flows through a square area of membrane on a side? (ii...
Wednesday, October 15, 2014 at 7:52pm

physics
In a particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.7 × 10 -27 kg. What is the force on the proton?
Wednesday, October 15, 2014 at 7:50pm

physics
You exert a force of a known magnitude F on a grocery cart of total mass m. The force you exert on the cart points at an angle θ below the horizontal. If the cart starts at rest, determine an expression for the speed of the cart after it travels a distance d. Ignore ...
Wednesday, October 15, 2014 at 7:50pm

physics
If the cart starts at rest, determine an expression for the speed of the cart after it travels a distance d. Ignore friction. I have to use F (known magnitude), m, the angle and d for distance.
Wednesday, October 15, 2014 at 7:47pm

Physics
A floor polisher has a rotating disk that has an 11-cm radius. The disk rotates at a constant angular velocity of 1.1 rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in one place for 43 s, in order to buff an especially scuffed...
Wednesday, October 15, 2014 at 7:31pm

Physics
A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the horizontal. Ignore any...
Wednesday, October 15, 2014 at 7:12pm

Physics
Even when the head is held erect, as in the figure below, its center of mass is not directly over the principal point of support (the atlanto-occipital joint, point A). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your ...
Wednesday, October 15, 2014 at 7:03pm

physics
A man threw a ball horizontally out of an elevator that was traveling upward at a rate of 5.50m/s. If the ball was thrown at a velocity of 10.5m/s when the elevator was 15.3m above the floor of the atrium. How far from the base of the elevator did it land?
Wednesday, October 15, 2014 at 7:01pm

physics
How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the earth) of one of the protons? (
Wednesday, October 15, 2014 at 6:56pm

physics
A uniform 3.05 kg board of length L = 1.58 m overhangs the edge of a table by x = 0.32 m. If a 4.87 kg block is placed on the board, what is the maximum distance d from the edge of the table that the block can be placed without tipping the board? so you have to solve for d. (L...
Wednesday, October 15, 2014 at 5:02pm

physics
Alice ((7.500x10^1) kg) and Bob ((8.5x10^1) kg) are standing at rest on friction free ice. Alice pushes Bob causing Bob to accelerate at (2.300x10^0) m/s^2. What is the magnitude of Alice’s acceleration?
Wednesday, October 15, 2014 at 4:29pm

physics
A (1.35x10^2) kg box is falling near Earth’s surface. It is accelerating at (7.3000x10^0) m/s^2 [D]. What is the force of air resistance on the box?
Wednesday, October 15, 2014 at 4:25pm

physics
what are the dimensions of power?
Wednesday, October 15, 2014 at 3:25pm

Physics
1.) Let's say that an an orange is launched upward at 22m/s. What is the displacement 3.5s later? 2.) When a volcano erupts, big rocks have been measured to reach heights of 50km (50,000m) What would the initial velocity need to be in order to reach such heights (neglect ...
Wednesday, October 15, 2014 at 1:59pm

physics
A body is at equilibrum under the action of three forces.one force is 10N acting due east and one is 5N in the direction 60degree north east.what is the magnitude and direction of the third force
Wednesday, October 15, 2014 at 11:51am

Physics/science
A stuntman drives a motorcycle off a 350 m cliff going 70 mph. The angle of elevation of the cliff is 21 degree. He is hoping to make it across a 261 m wide river and land on a ledge 82 m high. Does he make it? HELP ME PLSSSSSSS!!!!!
Wednesday, October 15, 2014 at 6:24am

physics
A worker on scaffolding 75 ft above the ground needs to lift a 410 lb bucket of cement from the ground to a point 25 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required
Wednesday, October 15, 2014 at 5:24am

Physics
The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?
Wednesday, October 15, 2014 at 3:35am

physics
The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
Wednesday, October 15, 2014 at 12:38am

Physics
The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
Wednesday, October 15, 2014 at 12:04am

physics
A 35.0 kg kid run with a horizontal velocity of 5.50 m/s and jumps onto a 5.00 kg sled. What is the velocity of the kid and sled after the impact, if there were no friction? (4.81 m/s)
Tuesday, October 14, 2014 at 11:37pm

Physics
The hydrogen atom contains 1 proton and 1 electron. The radius of the proton is approximately 1.0fm femtometers, and the radius of the hydrogen atom is approximately 53 pm (picometers). - Calculate the volume of the nucleus and the volume of the atom for hydrogen. - What ...
Tuesday, October 14, 2014 at 10:46pm

Physics
A child whose weight is 292 N slides down a 5.20 m playground slide that makes an angle of 35.0° with the horizontal. The coefficient of kinetic friction between slide and child is 0.130. (a) How much energy is transferred to thermal energy? (b) If she starts at the top ...
Tuesday, October 14, 2014 at 10:17pm

physics
A person pushes a 20.1-kg shopping cart at a constant velocity for a distance of 39.5 m on a flat horizontal surface. She pushes in a direction 27.3 ° below the horizontal. A 40.6-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
Tuesday, October 14, 2014 at 10:12pm

physics
A 80-kg man stands on a bathroom scale inside an elevator. (a) The elevator accelerates upward from rest at a rate of 1.40 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval? N (b) The elevator continues upward at constant velocity for 8.50 s. What does the ...
Tuesday, October 14, 2014 at 9:14pm

physics
The figure below shows Superhero hanging motionless from a rope, with Trusty Sidekick hanging below him. Superhero's mass is 89.0 kg, while Trusty Sidekick's is 58.0kg, and the mass of the rope is negligible. (a) Find the tension in the rope at a point between ...
Tuesday, October 14, 2014 at 9:13pm

physics
016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...
Tuesday, October 14, 2014 at 8:45pm

Physics
an athlete is attempting to jump over a bar that is 1.5 meters in the air what is the lowest initial velocity that the athlete must jump with in order to successfully jump over the bar
Tuesday, October 14, 2014 at 8:04pm

physics
016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...
Tuesday, October 14, 2014 at 7:27pm

Physics
What does it mean to have a 99.1% experimental uncertainty or percent deviation
Tuesday, October 14, 2014 at 7:15pm

Physics Projectile Motion
You arrive on an unknown planet with your team of astro-scientists. This time, to calculate acceleration due to gravity you decide to drive your buggy off of a 16 meter tall cliff. If you drive at a velocity of 22 m/s off the cliff and land 55.1 meters away, what is your air ...
Tuesday, October 14, 2014 at 7:04pm

physics
If each complete revolution of the pedals moves the bike 5.00m along its path, calculate the average force that must be exerted on the pedals tangent to their circular path. Neglect work done by friction and other losses. The pedals turn in a circle of diameter 38.4cm.
Tuesday, October 14, 2014 at 7:01pm

Physics
What do it mean to have a zero percent discrepancy?
Tuesday, October 14, 2014 at 6:21pm

Physics
a heavy metal chain of mass 0.60kg hangs over the edge of a table a)when half the chain is hanging over the edge,what is the magnitude of the net external force that causes the chain to accelerate?
Tuesday, October 14, 2014 at 6:01pm

Physics
Katie kicks a football at a 52 degree angle and a velocity of 31 m/s. At what times will it be 10 meters off the ground?
Tuesday, October 14, 2014 at 5:52pm

physics
A force of 3.25 N acts on a(n) 3.8 kg object for 16.5 s. What is the object’s change in momentum?
Tuesday, October 14, 2014 at 5:33pm

physics
A passenger on a ride at the firemen's field days sits in a chair and is swung around at the end of a cable connected to a central tower. At full speed, the cable makes an angle of 56 degree with the vertical, and the chair is 46 m from the pole. What is the speed of the ...
Tuesday, October 14, 2014 at 5:09pm

physics
A bumper car with mass m1 = 100 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 86 kg is moving to the left with a velocity of v2 = -3.8 m/s. The two cars have an elastic collision. Assume the surface is frictionless. 1) What is ...
Tuesday, October 14, 2014 at 4:40pm

physics
The system in the Figure is in equilibrium. A mass M1 = 226.0 kg hangs from the end of a uniform strut which is held at an angle è = 41.0° with respect to the horizontal. The cable supporting the strut is at angle á = 27.4° with respect to the horizontal...
Tuesday, October 14, 2014 at 4:19pm

physics
a net force of 72 n is applied to a 48 kg box starting from rest for 8 s. what is the final velocity of the box?
Tuesday, October 14, 2014 at 4:06pm

physics
a 65 kg skateboarder is standing on a stationary .5 kg skateboard. the skateboarder steps off the skateboard with a horizontal veolicty of 1.5 m/s. what is the recoil velocity of the skateboard ignoring friction? I need help with set up.
Tuesday, October 14, 2014 at 4:04pm

physics
A student is skateboarding down a ramp that is 7.06 m long and inclined at 29.0° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 4.03 m/s. Neglect friction and find the speed at the bottom of the ramp.
Tuesday, October 14, 2014 at 3:44pm

PHYSICS
Two people Simultaneously kick the same soccer ball, each with a force of 10. N. One force is directed 45 degrees N of E, the other 30 degrees S of E. What are the magnitude and direction of the resultant of their forces? I know that for one of them the angle is 30 degrees and...
Tuesday, October 14, 2014 at 3:41pm

Physics
A rocket lifts off its launching pas with a vertical velocity of 20. m/s and a horizontal velocity of 60. m/s. What are the magnitude and direction of its resultant velocity? I drew the x and Y axis. 20 m/s on the Y axis and 30 m/s on the X axis. I know I need to find the ...
Tuesday, October 14, 2014 at 3:37pm

Physics
Two people Simultaneously kick the same soccer ball, each with a force of 10. N. One force is directed 45 degrees N of E, the other 30 degrees S of E. What are the magnitude and direction of the resultant of their forces?
Tuesday, October 14, 2014 at 3:33pm

physics
four forces act as 10,12,9,15 calculate their resultant
Tuesday, October 14, 2014 at 3:11pm

physics
A truck with mass 2000 kg tows a boat and trailer of total mass 500 kg. The rolling coefficient of friction for the truck is 0.080 and for the trailer is 0.050. The force of the truck’s drive wheels pushing backward on the pavement is 3.0 kN. (a) Determine the ...
Tuesday, October 14, 2014 at 1:50pm

Physics
On June 9, 1988, Sergei Bubka broke the world pole-vaulting record for the 8th time in four years by attaining a height of 6.14 m. How long did it take Bubka to return to the ground from the highest part of his vault?
Tuesday, October 14, 2014 at 12:21pm

Physics
In ammonia, 14g of nitrogen combines completely with 3g of hydrogen. How many grams of hydrogen are needed to combined completely with 56 g of nitrogen? Need Help
Tuesday, October 14, 2014 at 11:40am

Physics
Two forces parallel to the x axis do 17.2 J of work on a small tray while moving it 19.0 m in the x direction across a gym floor. One of the forces has a value of +3.93 N in the x direction. What is the other force?
Tuesday, October 14, 2014 at 10:18am

physics
Ten , one rupees coin are put on the top at of each other on a table. Each coin has a mass 'm'. Give the magnitude and direction of - (1)- The force of 7th coin (counted from bottom) due to all coins on its top. (2)- The force of 7th coin by 8th coin. (3)- The reaction...
Tuesday, October 14, 2014 at 6:48am

physics
A disc revolve with a speed of 33.5 revolution per minute and has a radius of 15 cm .two coin are placed at 4 cm and 14 cm away from the center of disc. Coefficient of friction between coin and disc is 0.5 cm .which of the coin will revolve with the disc?
Tuesday, October 14, 2014 at 4:35am

physics
Ten ,one rupees coin are put on the top of at each other on a table each coin has a mass 'm' give the magnitudes and direction of - 1. The force of seventh coin (counted from bottom) due to all the coins. 2. The reaction of 6th coin on the 7th coin. 3. The force at 7th...
Tuesday, October 14, 2014 at 4:26am

physics
A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. The horizontal velocity of the plane is 250 km/h (69.4 m/s). Rescue plane releases the supplies a horizontal distance of 425 m in advance of the mountain climbers
Tuesday, October 14, 2014 at 3:39am

physics
a fire hose held near the ground shoots water at a speed of 6.4m/s, at what angle should
Tuesday, October 14, 2014 at 2:45am

physics
A baseball player throws a ball at an angle N of E from 3rd base to 1st base. if it takes 1.2 seconds to get there, at what velocity did he throw it? (bases on a baseball field are 90 feet apart) -9.8=0-27.432m/ .24
Tuesday, October 14, 2014 at 2:29am

physics
A baseball player throws a ball at an angle N of E from 3rd base to 1st base. if it takes 1.2 seconds to get there, at what velocity did he throw it? (bases on a baseball field are 90 feet apart) -9.8=0-27.432m/ .24
Tuesday, October 14, 2014 at 12:29am

Physics
Sam, whose mass is 73.0kg , takes off down a 50.0m high, 12.0∘ slope on his jet-powered skis. The skis have a thrust of 210N . Sam's speed at the bottom is 45.0m/s . What is the coefficient of kinetic friction of his skis on the snow?
Tuesday, October 14, 2014 at 12:23am

physics
Consider three force vectors F1 with magnitude 42N and direction 140°, F2 with magnitude 27N and direction -110°, and F3 with magnitude 19N and direction 120°. All direction angles 0 (0 with a line inside) are measured from the positive x axis: counter-clockwise ...
Monday, October 13, 2014 at 9:30pm

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. If the balloon misses or shoots over the building, how far will the balloon land from its launch location?
Monday, October 13, 2014 at 9:13pm

College Physics 1401
The Space Shuttle travels at a speed of about 7.60 103 m/s. The blink of an astronaut's eye lasts about 100 ms. How many football fields (length = 91.4 m) does the Shuttle cover in the blink of an eye?
Monday, October 13, 2014 at 9:06pm

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?
Monday, October 13, 2014 at 9:06pm

physics
A person walks 27m east and then walks 31m at an angle 38° north of east. What is the magnitude of the total displacement. Answer in units of m
Monday, October 13, 2014 at 9:06pm

physics
A particle undergoes two displacements. The first has a magnitude of 135cm and makes an angle of 114° with the positive x axis. The resultant displacement had a magnitude of 183cm and is directed at an angle of 21.8° to the positive x axis. Find the magnitude of the ...
Monday, October 13, 2014 at 9:02pm

physics
A metal sphere is launched with an initial velocity of 1.5 m/s as it leaves the ramp. The end of the ramp is 1.2 m above the floor. Calculate the range of the sphere.
Monday, October 13, 2014 at 9:00pm

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