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October 23, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

math physics
A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
Monday, October 13, 2014 at 8:54pm

math physics
A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
Monday, October 13, 2014 at 8:54pm

math physics
A meteorite is a solid composed of stone and/or metal material from outer space that passes through the atmosphere and hits the earth’s surface. Find the kinetic energy of a meteorite with mass 250 kg that hits the earth at 25 km/s. Given: m=250kg v=2.5E4m/s <<< ...
Monday, October 13, 2014 at 8:54pm

physics
Now the ramp is tilted downwards and the sphere leaves the ramp at 1.5 m/s. The bottom of the ramp is 0.90 m above the floor. Calculate the range of the sphere.
Monday, October 13, 2014 at 8:51pm

physics
As shown in the figure below, a box of mass m = 57.0 kg (initially at rest) is pushed a distance d = 79.0 m across a rough warehouse floor by an applied force of FA = 202 N directed at an angle of 30.0° below the horizontal. The coefficient of kinetic friction between the ...
Monday, October 13, 2014 at 8:25pm

Science Physics
A 250 kg part falls from a plane and hits the ground at 150 km/h. Find its kinetic energy. Would I need to convert 150km/h to m/s? then multiply with the mass?
Monday, October 13, 2014 at 8:08pm

854 physics
A 1.06 kg ball is attached to a ceiling by a 1.25 m long string. The height of the room is 5.82 m The acceleration of gravity is 9.8 m/s 2 . What is the gravitational potential energy associated with the ball relative to the ceiling? Answer in units of J
Monday, October 13, 2014 at 8:06pm

physics
A block is pushed against the spring with spring constant 11 kN/m
Monday, October 13, 2014 at 7:42pm

physics
Find the final speed of the train assuming no friction. Answer in units of m/s
Monday, October 13, 2014 at 7:34pm

Science Physics
The Hoover Dam is 726 ft high. Find the potential energy of 1.00 million ft3 of water at the top of the dam.(1 ft3 of water weighs 62.4 lb.)
Monday, October 13, 2014 at 7:32pm

physics
distance a cannonball travels when shot horizontally with a velocity of 28.3 at 30 degrees? I'm not sure what formula I need to use. Please help.
Monday, October 13, 2014 at 7:15pm

physics
In the 1950’s, an experimental train that had a mass of 16200 kg was powered across a level track by a jet engine that produced a thrust of 5.02 × 105 N for a distance of 565 m. Find the work done on the train. Answer in units of J
Monday, October 13, 2014 at 7:13pm

physics
A 92.7 N grocery cart is pushed 13.7 m along an aisle by a shopper who exerts a constant horizontal force of 33.4 N. The acceleration of gravity is 9.81 m/s 2 . If all frictional forces are neglected and the cart starts from rest, what is the grocery cart’s final speed? ...
Monday, October 13, 2014 at 7:01pm

Physics
Spiderman is standing on the edge of a rooftop 100m above a swimming pool. He decides to jump in to cool off, so he springs out at a velocity of 30 m/s at an angle of 35 degrees above the horizontal. The near edge pool is located 127 m from the base of the building. It is a ...
Monday, October 13, 2014 at 6:47pm

physics
a cat chases a mouse across a 0.55 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 2.7 m from the edge of the table. The acceleration of gravity is 9.81 m/s. what was the cats speed when it slid off the table?
Monday, October 13, 2014 at 6:43pm

physics
A car travels 15.5 km due north and then 38.6 km in a direction φ = 74.3 ◦ west of north.Find the magnitude of the car’s resultant displacement. Answer in units of km
Monday, October 13, 2014 at 5:56pm

Physics
A square loop of wire of side 3.0 cm carries 3.0 A of current. A uniform magnetic field of magnitude 0.67 T makes an angle of 37degree with the plane of the loop. What is the magnitude of the torque on the loop? What is the net magnetic force on the loop?
Monday, October 13, 2014 at 5:35pm

physics
A frictionless massless pulley has 7 kg tied to a cable on the left side and an unknown mass (M) on the right. The unknown mass accelerates downward at 6.6 m/s2 What is the accelerationof the system/tension of the rope
Monday, October 13, 2014 at 5:12pm

Physics
a singly charged ion of uknown mass moves in a circle of radius 12.5 cm in a magnetic field of 1.7 t. the ion was accelerated through qa potential difference of 5.7 kv before it entered the magnetic field. what is the mass of the ion
Monday, October 13, 2014 at 4:53pm

Physics
A particle of mass =6.50 kg moves with a velocity v1=x1i+y1j+z1k. A second particle of mass =3.50 kg moves with a velocity v2=x2i+y2j+z2k. And a third particle of mass =6.30 kg moves with a velocity v3=x3i+y3j+z3k. Here, (x1,y1,z1)=(-2.5,5.4,1.2), (x2,y2,z2)=(-2.3,0.1,-2.5) ...
Monday, October 13, 2014 at 4:21pm

Physics
High-speed stroboscopic photographs show that the head of a golf club of mass 231g is traveling at 59.0m/s just before it strikes a 47.1g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 44.3m/s. Calculate the speed of the golf ...
Monday, October 13, 2014 at 3:55pm

Physics
Two acrobats, each of 50.0 kg, launch themselves together from a swing, holding hands. Their velocity at launch was 6.80 m/s and the angle of their initial velocity relative to the horizontal was 36.0 degrees upwards. At the top of their trajectory, their act calls for them to...
Monday, October 13, 2014 at 3:54pm

Physics
The space shuttle, with an initial mass M = 2.41×106 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s^2. The rate of fuel consumption is R = 6.90×103 kg/s. The shuttle reaches outer space with a velocity of vo = 4632. m/s...
Monday, October 13, 2014 at 3:51pm

College Physics
Two crates are connected by a massless rope that passes over a pulley. If the crates have mass 33 kg and 82 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 12 m above the floor, how long does it take for the more massive crate ...
Monday, October 13, 2014 at 3:43pm

College Physics
A hockey puck is sliding down an inclined plane with angle θ = 12.4° as shown in the figure below. If the puck is moving with a constant speed, what is the coefficient of kinetic friction between the puck and the plane?
Monday, October 13, 2014 at 3:42pm

College Physics
There are two forces acting on an object. One force has a magnitude of 35 N and is directed along the +x axis. The other force has a magnitude of 20 N and is directed along the +y axis. What is the direction of the acceleration of the object? Express your answer by giving the ...
Monday, October 13, 2014 at 3:41pm

Physics
A balloon, when rubbed against denim, gains a charge of -10ìC. The force between the balloon and the denim when they are separated by a distance of 5 cm is:
Monday, October 13, 2014 at 3:24pm

physics
With friction turned on, set the initial velocity of the box to 1.75 m/s, the coefficient of friction to 0.60, and the mass to 1.5 kg. Assume the acceleration due to gravity has a magnitude of 9.8 m/s2.
Monday, October 13, 2014 at 3:21pm

physics
A space probe is to be put into a circular orbit of radius 42.00 km about an asteroid. At this radius the magnitude of the gravitational acceleration, normally referred to as the "gravitational field", is 1.00×10-3 meters per second squared. What speed, in ...
Monday, October 13, 2014 at 2:34pm

physics
Suppose a roller-coaster car starts at a height of 39 m with a speed of 2.51 m/s. What will its speed be at height = 0m if the average force of friction is equal to 0.22 times its weight? The total distance traveled is 53m.
Monday, October 13, 2014 at 2:11pm

College Physics
A skier is traveling at a speed of 39.7 m/s when she reaches the base of a frictionless ski hill. This hill makes an angle of 14° with the horizontal. She then coasts up the hill as far as possible. What height (measured vertically above the base of the hill) does she reach?
Monday, October 13, 2014 at 1:48pm

Physics - Spring Gun
A toy gun uses a spring to shoot a ball with a mass of 5.0 g. The spring is “loaded” by compressing it 5.0 cm and has a spring constant of 288 N/m. The end of the spring is at the end of the gun (the ball does not travel any distance inside the gun after the spring) ...
Monday, October 13, 2014 at 1:12pm

Physics
While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.27. The pushing force is directed downward at an angle θ below the horizontal. When θ is greater than a ...
Monday, October 13, 2014 at 11:26am

Physics
You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 120 N, the sled has an acceleration of 1.7 m/s2 If the sled has a mass of 8.4 kg, what is the mass of your little sister?
Monday, October 13, 2014 at 10:44am

Physics graphing
Im making a graph of magnetic force vs current, after investigating the magnetic force exerted on a current-carrying wire, and how it varies with current, length, magnetic field and angle. How do I know when to use the point (0,0) on the graph?
Monday, October 13, 2014 at 10:27am

physics
the intensity level of a sound A is5dB greater than that of sound B and 3dB less than that of C. determine the ratio (Ic/Ib) of the intensity of sound C to that of sound B.
Monday, October 13, 2014 at 9:28am

physics please help
Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
Monday, October 13, 2014 at 8:06am

physics
for the uniform T shaped structure with mass 3M moment of inertia about an axis normal to the plane & passing through O would be
Monday, October 13, 2014 at 7:44am

physics
a ball is thrown straight up with a speed of 8.0 m/s from a third-floor window located 13.0 m above ground. Calculate the maximum height, measured from the ground, of the ball; calculate the ball's velocity when it reaches the ground, and calculate the total time it takes ...
Monday, October 13, 2014 at 12:40am

physics
Jordan throws a golfball straight up from the top of a building 50 meters high. The initial speed of the golfball is 20 m/s and it just misses the edge of the roof when it eventually falls. Neglecting air resistance, find the velocity of the golfball just at the instant it ...
Sunday, October 12, 2014 at 11:21pm

physics
A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?
Sunday, October 12, 2014 at 10:32pm

physics
A bicycle tire rotates at 30 radians/s. If the bicyclist travels at 10m/s, what is the diameter of the tire?
Sunday, October 12, 2014 at 8:26pm

Physics
Two children are playing on two trampolines. The first child can jump one and a half times higher than the second child. The initial speed of the second child is 5 m/s. What is the maximum height of the second child? What is the initial speed of the first child? How long was ...
Sunday, October 12, 2014 at 8:16pm

Physics
A northbound 3000 kg truck collides with an eastbound 2000 kg car. The two vehicles slide together as a single mangled object after the collision, and the direction of the slide is exactly northeast (45 degree angle between north and east). Which vehicle was going faster ...
Sunday, October 12, 2014 at 5:14pm

physics
A particle of mass 7.7 × 10-8 kg and charge +11 μC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 4.2 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time...
Sunday, October 12, 2014 at 5:13pm

Physics 12
how to calculate the tie when the initial velocity of and object (rock) is given ( 12m/s 42 degrees above the horizontal. The object land at the other side of say a moat at a level of 9.5 m below the initial level. Air resistance is negligible. What is the time of flight? (the...
Sunday, October 12, 2014 at 4:54pm

physics
Stones are thrown horizontally with the same velocity from two buildings. One stone lands 1.81 as far away from its building as the other stone. Determine the ratio of the heights of the two buildings.
Sunday, October 12, 2014 at 2:06pm

physics
A box slides down a 28° ramp with an acceleration of 0.98 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.
Sunday, October 12, 2014 at 1:38pm

physics
If you wanted to make a barometer that had a column of liquid about 6 feet tall, what would the density of the liquid have to be? 1 meter = 3.28 ft 1 inch = 2.54 cm Density Hg = 13.6 g/mL 1atm = 760 torr
Sunday, October 12, 2014 at 1:04pm

physics
A projectile is fired with muzzle velocity v uphill over ground that slopes at an angle α to the horizontal. If the angle of projection is θ to the horizontal: i) show that the horizontal range is x = 2v2 (cos θ sin θ − cos2 θ tan α) /g ii) ...
Sunday, October 12, 2014 at 11:17am

Physics
If a car increases its speed from 5 meters per second to 25 meters per second over 40 seconds. what is the acceleration? Give the unit.
Sunday, October 12, 2014 at 10:28am

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