Thursday
October 30, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

Post a New Question | Current Questions

Physics need help
Carbon monoxide is a gas at 0 degree Celsius and a pressure of 1.51x10^5 Pa. It is a diatomic gas, each of its molecules consisting of one carbon atom (atomic mass = 12.o u) and one oxygen atom (atomic mass = 16.0 u). Assuming that carbon monoxide is an ideal gas, calculate ...
Monday, October 27, 2014 at 6:43pm

Physics
A car, moving along a straight stretch of highway, begins to accelerate at 0.0235 m/s 2 It takes the car 67.8 s to cover 1 km.How fast was the car going when it first began to accelerate?
Monday, October 27, 2014 at 6:41pm

Physics
In the movie Superman, Lois Lane falls from a building and is caught by the diving superhero. Assuming that Lois, with a mass of 45 kg, is falling at a terminal velocity of 56 m/s, A)how much force does Superman exert on her if it takes 0.7 s to slow her to a stop? B)If Lois ...
Monday, October 27, 2014 at 6:39pm

Physics
A circular pond of radius 12 m has a layer of ice 0.25 m thick. On a spring day, the temperature of the water below the ice is 4.0°C and the temperature of the air above is 11°C. What is the rate of heat transfer through the ice, in kW?
Monday, October 27, 2014 at 6:36pm

Physics
A large pot is placed on a stove and 1.2 kg of water at 14°C is added to the pot. The temperature of the water is raised evenly to 100°C just before it starts to boil. (a) What amount of heat is absorbed by the water in reaching 100°C? (b) The water then boils ...
Monday, October 27, 2014 at 6:36pm

Physics Science
(a) Find the total force on the bottom of a cylindrical gasoline storage tank 15.0 m high with radius 23.0 m. (b) Find the total force on the side of the tank.
Monday, October 27, 2014 at 6:30pm

Physics
The initial speed of a body is 3.01 m/s. What is its speed after 3.89 s if it accelerates uniformly at 3.63 m/s 2 ? Answer in units of m/s
Monday, October 27, 2014 at 6:30pm

Physics
A block of mass m1 = 41.3 kg on a horizontal surface is connected to a mass m2 = 13.2 kg that hangs vertically as shown in the figure below. The two blocks are connected by a string of negligible mass passing over a frictionless pulley. Assume that the horizontal surface is ...
Monday, October 27, 2014 at 6:20pm

Physics
What is the minimum energy needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
Monday, October 27, 2014 at 6:01pm

physics
A car accelerates uniformly in a straight line from rest at the rate of 3.7 m/s2 . What is the speed of the car after it has traveled 67 m? Answer in units of m/s 014 (part 2 of 2) 10.0 points How long does it take the car to travel 67 m? Answer in units of s
Monday, October 27, 2014 at 6:01pm

physics
The velocity v(t) of a particle is plotted as a function of time. The scale on the horizontal axis is 9 s per grid square and on the vertical axis 2 m/s per grid square. Initially, the particle is at x0 = 43 m.
Monday, October 27, 2014 at 6:00pm

physics
016 (part 1 of 2) 10.0 points A speedboat increases in speed from 17.9 m/s to 31.8 m/s in a distance 188 m. Find the magnitude of its acceleration.
Monday, October 27, 2014 at 5:50pm

Science Physics
A pile driver falls a distance of 1.75 m before hitting a pile. Find its velocity as it hits the pile. So its 1.75x9.80=17.15?
Monday, October 27, 2014 at 5:48pm

physics
A 65kg astronaut (including spacesuit and equipment), is floating at rest a distance of 6m from the spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it away from the ship at a speed of 15 m/s ...
Monday, October 27, 2014 at 5:41pm

Physics
A space craft made up of two parts with masses m1 = 2.3 kg and m2 = 3.4 kg is held together by explosive bolts against a spring. The spring is compressed by 73.0 cm and has negligible mass. After the bolts are exploded m1 is found to have a speed of 3.6 m/s away from the ...
Monday, October 27, 2014 at 5:28pm

physics intro
A 0.175-lb ball is thrown upward with an initial velocity of 75.0 ft/s. What is the maximum height reached by the ball? Would I need to set it up like √2*75.0*-32.2/0/175?
Monday, October 27, 2014 at 5:02pm

Physics
A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
Monday, October 27, 2014 at 4:40pm

Math Physics
Water is pumped at 250m^3/min from a lake into a tank 65.0 m above the lake. (a) What power, in kW, must be delivered by the pump? (b) What horsepower rating does this pump motor have? (c) What is the increase in potential energy of the water each minute?
Monday, October 27, 2014 at 4:21pm

physics
A small block of mass m = 225 g is released from rest at point circled A along the horizontal diameter on the inside of a frictionless, hemispherical bowl of radius R = 27.5 cm as shown in the figure below. (a) Calculate the gravitational potential energy of the block-Earth ...
Monday, October 27, 2014 at 4:06pm

Physics
The wheels, axle, and handles of a wheelbarrow weigh W = 57 N. The load chamber and its contents weigh WL = 674 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the ...
Monday, October 27, 2014 at 3:09pm

Physics
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=54300 N. The lift force L generated by the rotating blade makes an angle of 21.0° with respect to the vertical. (a) What is the magnitude of the lift...
Monday, October 27, 2014 at 3:03pm

physics
A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 555 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap?
Monday, October 27, 2014 at 2:13pm

physics
A person is pulled to the right on a sled (total mass of 60.1 kg) across the surface of a frozen pond with a force of 62.9 Newtons so that they move with a constant velocity. What is the force of friction acting on the sled? Choose your coordinate system so that upward, and to...
Monday, October 27, 2014 at 2:09pm

physics
Let's say you measure an average acceleration to be 0.44 ms-2. What is the height (in centimeters) of the riser block? Assume the legs of the track span 1.0000 m and that there is neither friction nor drag. Also assume the block is under one of the legs.
Monday, October 27, 2014 at 1:52pm

physics
A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of the book? 0.45 kilograms 0.90 kilograms 1.35 kilograms 1.5 kilograms 1.8 kilograms
Monday, October 27, 2014 at 10:13am

Physics
A beam of particles is directed at a 0.017-kg tumor. There are 2.4 x 1010 particles per second reaching the tumor, and the energy of each particle is 5.2 MeV. The RBE for the radiation is 14. Find the biologically equivalent dose given to the tumor in 27 s.
Monday, October 27, 2014 at 6:01am

Physics
Two springs, each with spring constant 20 N/m, are connected in parallel, and the combination is hung vertically from one end. A 10-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
Monday, October 27, 2014 at 4:17am

physics
A beam of particles is directed at a 0.016-kg tumor. There are 2.1 x 1010 particles per second reaching the tumor, and the energy of each particle is 5.4 MeV. The RBE for the radiation is 14. Find the biologically equivalent dose given to the tumor in 16 s.
Monday, October 27, 2014 at 2:50am

physics
A 150-N ladder leans against a smooth wall, inclined at an angle of 60 degrees above the floor. The centre of gravity of the ladder is at point on the ladder which is one-third the length of the ladder from the bottom. How large a horizontal force must the floor provide if the...
Monday, October 27, 2014 at 1:55am

physics
a 20-kg box sits on a level floor. the coefficient of kinetic friction between floor and box is 0,60. how large a friction force opposes the motion of the box while moving? how much work must be done against friction to move the box 5,0 m?
Monday, October 27, 2014 at 12:22am

physics
A person is kayaking in the ocean at 5.6 m/s 75° to the horizon when he experiences a current of 3.8 m/s 45° south of west. What is the speed and direction of his kayak?
Sunday, October 26, 2014 at 11:18pm

Physics
A 15 kg sled experiences an applied force of 5.5 N [north] and an opposing frictional force of 2.5 N [south]. If the sled starts from rest, what will be the velocity of the sled after 4.0 s?
Sunday, October 26, 2014 at 11:00pm

Physics
(a) A small mail bag is released from a helicopter that is descending steadily at 2.13 m/s. After 4.38 s, what is the speed of the mail- bag? The acceleration of gravity is 9.8 m/s2 . (b) After the mailbag is dropped, the helicopter continues descending for 1 s but then stops...
Sunday, October 26, 2014 at 10:17pm

Physics
A 940 kg car moves along a horizontal road at speed v0 = 16.8 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.196 and the kinetic friction coefficient is even lower, μk = 0.1372. The acceleration of gravity is 9....
Sunday, October 26, 2014 at 9:26pm

Physics
A ball is thrown horizontally from the top of a building 17.6 m high. The ball strikes the ground at a point 67.7 m from the base of the building. The acceleration of gravity is 9.8 m/s2. Find the time the ball is in motion
Sunday, October 26, 2014 at 9:16pm

physics
The system of blocks shown in the diagram below is being accelerated to the right at 4.4 m/s2 What is the applied force Small box mass- 0.10 kg Big box mass - 0.20 kg Acceleration - 4.4 m/s2 Coefficient kinetic - 0.35
Sunday, October 26, 2014 at 8:25pm

PHYSICS (VECTOR)
A plane is flying due South (270º) at 474.8 km/h. A wind blows from West to East (0°) at 46 km/h. Find the direction of the plane's travel. Report your answer in degrees from 0° as a reference.
Sunday, October 26, 2014 at 7:44pm

physics
A diving bell has a weight of 30000 N when measured on shore. In the water, suspended by a cable, the tension in the cable is only 12000 N. What is the buoyant force, FB, on the diving bell when it is in the water?
Sunday, October 26, 2014 at 7:21pm

Physics
A figure skater is spinning at a rate of 1.1 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 66% of its original value. What is her new rate of rotation?
Sunday, October 26, 2014 at 7:20pm

physics
how much will the velocty of a car be in 24 seconds
Sunday, October 26, 2014 at 7:08pm

physics
The position of a toy locomotive moving on a straight track along the x-axis is given by the equation x = t4 − 6 t2 + 9 t , where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to
Sunday, October 26, 2014 at 6:18pm

physics
A copper (Young's modulus 1.1 x 1011 N/m2) cylinder and a brass (Young's modulus 9.0 x 1010 N/m2) cylinder are stacked end to end, as in the drawing. Each cylinder has a radius of 0.14 cm. A compressive force of F = 4800 N is applied to the right end of the brass ...
Sunday, October 26, 2014 at 6:15pm

Physics
Jeff’s basketball falls into a pond. There is no wind and the water is still. Jeff wants to get the ball. He throws a rock into the pond, which hits water at 2 ft behind the ball from Jeff’s view. What will happen to the ball?
Sunday, October 26, 2014 at 5:07pm

Physics
A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the ...
Sunday, October 26, 2014 at 4:55pm

CHEMISTRY
As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from ...
Sunday, October 26, 2014 at 4:52pm

Physics
While following the directions on a treasure map, a pirate walks 49.7 m north, then turns and walks 4.1 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure?
Sunday, October 26, 2014 at 4:47pm

physics
1- An elevator, when fully loaded, has a mass of 5500 kg. The elevator needs to accelerate anywhere from 2.7 m/s^2 [D] to 2.7 m/s^2 [U]. What is the maximum tension force that the elevator cable will need to support during normal use? can we use fnet principle here, so when ...
Sunday, October 26, 2014 at 4:20pm

physics
A 1300-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 17.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision?
Sunday, October 26, 2014 at 4:06pm

Physics(Science)
Waves on a 5.0 m rope travel at a speed of 92 m/s. If the tension in the rope is 497 N, what is the mass of the rope?
Sunday, October 26, 2014 at 3:32pm

physics
A 83 kg person is hanging off the edge of a cliff, holding a rope. A 101 kg person is on the top of the cliff holding the other end of the rope. Find the minimum coefficient of static friction that would prevent the 83 kg person from falling.
Sunday, October 26, 2014 at 3:08pm

physics
a student leaves home and walks 100 m in a northerly direction. he then walks in a direction of 45 degree north of east for 50 m to reach school. calculate the displacement graphically. choose a scale to draw the diagram
Sunday, October 26, 2014 at 10:54am

physics
draw the following position vectors, find the displacement and present it on diagram. di=2 m df=5m di=3m df= -4m
Sunday, October 26, 2014 at 10:47am

physics
A compact car, mass 730 kg, is moving at 1.00 ✕ 102 km/h toward the east. The driver of the compact car suddenly applies the brakes hard for 1.9 s. As a result, an average force of 4.8 ✕ 103 N is exerted on the car to slow it down. What is the momentum now?
Sunday, October 26, 2014 at 10:42am

Physics
A 1300-kg car moving north at 27.0 m/s is struck by a 2165-kg car moving east at 17.0 m/s. The cars are stuck together. How fast and in what direction do they move immediately after the collision?
Sunday, October 26, 2014 at 10:35am

physics
draw a particle model and a motion diagram for A bike travels at constant speed of 4.0 m/s for 4 s then slow down to come at rest in 3 s.
Sunday, October 26, 2014 at 10:17am

physics
If an object is initially moving with a constant velocity of 20m/s towards positive x-axis and after 5 sec it changes its direction and moving at an angle of 30o with x-axis, find magnitude and direction of its acceleration.
Sunday, October 26, 2014 at 10:13am

n. i. o. s physics
How would you design a black body?
Sunday, October 26, 2014 at 9:52am

Physics
A cannon ball is fired horizontally with velocity of 15m from the top of a cliff 90m high.after how many seconds will it hit the foot of the cliff(a)time (b)at what distance from the foot of the cliff will it strike.
Saturday, October 25, 2014 at 11:18pm

Physics , Pls help
A space station consists of two donut-shaped living chambers, A and B, that have the radii shown in the figure. As the station rotates, an astronaut in chamber A is moved 2.06 x 102 m along a circular arc. How far along a circular arc is an astronaut in chamber B moved during ...
Saturday, October 25, 2014 at 9:46pm

Physics
Three charges are placed at the vertices of an isosceles triangle as shown in the figure. If q = 5.00 μC, calculate the electric potential at the midpoint of the base of the triangle. Also calculate the electric field vector at the same point due to the 3 charges. +q 4cm...
Saturday, October 25, 2014 at 9:01pm

physics
A motorcycle has a mass of 1000 kg. The motorcycle is slowed from 50 km/hr to a stop in 5s. What is the net force causing the deceleration?
Saturday, October 25, 2014 at 8:52pm

Physics
In a football game, a quarterback (G), hit simultaneously by two linebackers, experiences horizontal forces of 412 N [27.0° W of N] and 478 N [36.0° N of E]. Determine the net force of the quarterback.
Saturday, October 25, 2014 at 7:31pm

physics
the 5.0 kilogram block shown below is accelerated from rest across a wood floor (coefficient kinetic friction 0.22) by a 40 N pulling force for 3.0 seconds What us the blocks final velocity/speed? I am not sure what force i am supposed to calculate??
Saturday, October 25, 2014 at 7:02pm

physics
A ball is dropped from the top of a building. The balls fall 3 times farther during its last second of freefall than it did during its third second of freefall. The ball fell 4.9 meters during its first second, how tall is the building and how much time is the ball in the air...
Saturday, October 25, 2014 at 6:48pm

physics
A Titan IV rocket has put your spacecraft in a circular orbit around Earth at an altitude of 230 km. Calculate the force due to gravitational attraction between the Earth and the spacecraft in N if the mass of the spacecraft is 2300 kg.
Saturday, October 25, 2014 at 3:58pm

physics
To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. It is found that she weighs 690 N when weighed in air and 36.0 N when weighed underwater. What is her average density?
Saturday, October 25, 2014 at 3:34pm

Physics
A 66.0 kg base runner begins his slide into second base when moving at a speed of 4.4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to friction...
Saturday, October 25, 2014 at 2:56pm

Physics
A 1200 kg car pulls a 510 kg trailer. The car exerts a horizontal force of 4040 N against the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.160 for the trailer.
Saturday, October 25, 2014 at 12:34pm

Physics
A(n) 160 g block is pushed by an external force against a spring with spring constant of 1260 N/m until the spring is compressed by 11.8 cm from its uncompressed length. The compressed spring and block rests at the bottom of an incline of angle θ = 39.0°. Note that ...
Saturday, October 25, 2014 at 12:19pm

Physics
A block of mass 11.2 kg slides from rest down a frictionless 24.0° incline and is stopped by a strong spring with a spring constant 31.3 kN/m (note the unit). The block slides 8.90 m from the point of release to the point where it comes to rest against the spring. When the...
Saturday, October 25, 2014 at 11:41am

physics
A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . (please include an FBD when giving the solutions) a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the ...
Saturday, October 25, 2014 at 11:39am

physics
A 20 g fridge magnet is being held onto the fridge by a 0.9 N force. coefficient of kinetic friction is 0.3 . a. calculate the friction acting on the magnet. b. calculate the weight of the magnet c.the acceleration of the magnet. also, explain the situation, cause i dont get it.
Saturday, October 25, 2014 at 11:38am

physics
a car accidently roll off a cliff. as it leaves the cliff it has a horizontal velocity of 13m/s.it hits the ground 60m from the shoreline. calculate the height of cliff.
Saturday, October 25, 2014 at 10:32am

physics
What is the electric field intensity of a point 15cm from a charge 15microcoulomb
Saturday, October 25, 2014 at 5:41am

Physics
For the remaining parts of this question use the following settings in "Uniform circular motion" mode. The initial angular velocity is 4.1 rad/s and the radius is 4.1 cm. (c) What is the speed of the object at a time t = 3.0 s after the simulation is started?
Saturday, October 25, 2014 at 3:32am

Physics
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 36.6 m/s in a time of 8.22 s. The mass of the car and riders is 3.94 × 103 kg. Find the average net force exerted on the car and riders by the magnets.
Friday, October 24, 2014 at 11:43pm

Physics
What are the products (either vector or scalar for each answer) of: a) scalar x scalar b) scalar x vector c) vector x vector A simple concept, but I want to be sure I get it right! Thanks for any help :)
Friday, October 24, 2014 at 11:09pm

College physics
When a 0.15 kg baseball is hit, it approaches the bat with a speed of 20 m/s and undergoes an elastic collision. (a) What is the impulse delivered to the bat by the ball? (b) If the baseball is in contact with the bat for 1.3 ms, what is the average force exerted by the bat on...
Friday, October 24, 2014 at 10:30pm

Physics
A mouse sits on a turntable 14.8 cm from the center. The coefficient of static friction is 0.49. The angular velocity increases steadily from zero. At what angular velocity does the mouse begin to slide? I believe that the max frictional force can be is momentum x normal force...
Friday, October 24, 2014 at 9:12pm

physics
Due to friction with the Earth's atmosphere, a large static electric charge could build up on our plummeting asteroid fragment. Would you expect our fragment to generate a magnetic field? Explain why or why not.
Friday, October 24, 2014 at 8:47pm

Physics
In the figure, a 52 kg rock climber is climbing a “chimney” between two rock slabs. The coefficient of static friction between her shoes and the rock is 1.20; between her back and the rock it is 0.707. She has reduced her push against the rock until her back and her ...
Friday, October 24, 2014 at 8:41pm

Physics
A father pulls his son, whose mass is 27.3 kg and who is sitting on a swing with ropes of length 2.85 m, backward until the ropes make an angle of 36.8° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the ...
Friday, October 24, 2014 at 8:34pm

Physics!
A spring with a spring constant of 224.3 N/m is compressed by 0.253 m. Then a steel ball bearing of mass 0.0433 kg is put against the end of the spring, and the spring is released. What is the speed of the ball bearing right after it loses contact with the spring? (The ball ...
Friday, October 24, 2014 at 8:25pm

Physics!
A car of mass 1298.7 kg is moving at a speed of 64.0 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0.234 s, how much average power (in watts) is expended in this interval?
Friday, October 24, 2014 at 8:24pm

Physics
If you are at the top of a toboggan run that is 44.3 m high, how fast will you be going at the bottom, provided you can ignore friction between the sled and the track?
Friday, October 24, 2014 at 8:21pm

Physics
A classmate throws a 1.1-kg book from a height of 1.3 m above the ground straight up into the air. The book reaches a maximum height of 4.0 m above the ground and begins to fall back. Assume that 1.3 m above the ground is the reference level for zero gravitational potential ...
Friday, October 24, 2014 at 8:20pm

Physics
A classmate throws a 1.1-kg book from a height of 1.3 m above the ground straight up into the air. The book reaches a maximum height of 4.0 m above the ground and begins to fall back. Assume that 1.3 m above the ground is the reference level for zero gravitational potential ...
Friday, October 24, 2014 at 8:16pm

physics
why is it that drivers place cement blocks and other heavy items in the trucks of their vehicles? (think of friction and normal force)
Friday, October 24, 2014 at 7:35pm

physics
Calculate the mass of H2O produced by metabolism of 2.6kg of fat, assuming the fat consists entirely of tristearin (C57H110O6), a typical animal fat, and assuming that during metabolism, tristearin reacts with O2 to form only CO2 and H2O.
Friday, October 24, 2014 at 7:28pm

.
Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of ...
Friday, October 24, 2014 at 5:40pm

Physics
A 2.10 kg frictionless block is attached to an ideal spring with force constant 315N/m . Initially the block has velocity -3.75m/s and displacement 0.270m . Find (a) the amplitude of the motion. (b) the maximum acceleration of the block. (c) the maximum force the spring exerts...
Friday, October 24, 2014 at 4:10pm

physics
To push a 16 kg crate up a frictionless incline, angled at 32° to the horizontal, a worker exerts a force of 108.0 N, parallel to the incline. As the crate slides 1.50 m, how much work is done on the crate by the worker's applied force?
Friday, October 24, 2014 at 2:34pm

Physics
A block of mass m = 800 g is released from rest and slides down a frictionless track of height h = 57.0 cm. At the bottom of the track the block slides freely along a horizontal table until it hits a spring attached to a heavy, immovable wall. The spring compressed by 2.49 cm ...
Friday, October 24, 2014 at 1:51pm

physics
About the years 214-212 BC, the Greek philosopher and scientist Aρχιμηδ ​51;ζ is said to have repelled a Roman attack with a "death-ray" concave mirror, using sunlight to set the approaching fleet on fire. Assume an early ...
Friday, October 24, 2014 at 1:18pm

Physics
As shown in the figure below, a skateboarder starts at point A on the ramp and rises to point B, a maximum height of h = 2.89 m above the top of the ramp. If the amount of work done against friction is insignificant, determine his initial speed at point A.
Friday, October 24, 2014 at 12:04pm

Physics
as you are riding in a 1650-kg car, you approach a hairpin curve in the road whose radius is 50m. the roadbed is banked inward at anangle of 10 degrees. suppose that the road is dry and that the static friction coefficient between the tires and the asphalt road is .6 what is ...
Friday, October 24, 2014 at 3:46am

physics
A small pumpkin of mass 2.22 kg is dropped from rest from a height of 2.87 m. The pumpkin rebounds from the ground to a height of 1.12 m. a. With what speed does the pumpkin hit the ground? b. With what speed does the pumpkin leave the ground? c. What impulse was given to the ...
Friday, October 24, 2014 at 12:05am

physics
A 1075 kg van, stopped at a traffic light, is hit directly in the rear by a 705 kg car traveling with a velocity of +2.06 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of ...
Thursday, October 23, 2014 at 10:59pm

physics
A ball is projected upward at time t = 0.0 s, from a point on a roof 10 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in the upward direction. At time the velocity of the ball is ...
Thursday, October 23, 2014 at 9:53pm

Simple Physics
Which of the following is most appropriate to follow motion in one dimension? -linear scale -solid coordinates -x-y-z coordinates -graph with x- and y-axes
Thursday, October 23, 2014 at 9:21pm

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members