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March 29, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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PHYSICS
What magnitude is not possible when a vector of magnitude 3 is added to a vector of magnitude 4?
Tuesday, November 4, 2014 at 11:39pm

Physics
A 4.9 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 14 N. Find the speed of the block after it has
Tuesday, November 4, 2014 at 11:05pm

Physics
An 8.00g bullet is fired at 220m/s into a 250g wooden block that is initially at rest. The bullet remains in the block and after the collision the two slide up a 30° incline. a. Solve for the velocity of the bullet-block after the collision. (ans: 6.82m/s) b. Determine ...
Tuesday, November 4, 2014 at 10:35pm

physics
During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 0.144-kg baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 14.9 m / s, shatters the glass as it passes through, and leaves the ...
Tuesday, November 4, 2014 at 8:55pm

physics
a standard coordinate system (+x to the right, +y upwards and +z out of the page) a particle with a positive charge is travelling in the +x direction when it encounters a magnetic field in the −y direction. In which direction will the magnetic force act on the particle?
Tuesday, November 4, 2014 at 8:41pm

Physics
gazelle traveling 200 m/s is launched at a 40 degree angle with respect to the horizontal.
Tuesday, November 4, 2014 at 8:32pm

physics
You are loading a refrigerator weighing 2250 N onto a truck, using a wheeled cart. The refrigerator is raised 1.00 m to the truck bed when it is rolled up a ramp. Calculate the minimum work that must be done by the force you apply and the magnitude of the force if the ramp is ...
Tuesday, November 4, 2014 at 8:24pm

Physics
A vector is directed at an angle tangent above the +x axis, pointing into the first quadrant. If the x component of this vector is 10 m, the magnitude of the vector is?
Tuesday, November 4, 2014 at 7:44pm

physics
Rocket-powered sleds are been used to test the responses of humans to acceleration. Start- ing from rest, one sled can reach a speed of 510 m/s in 2.37 s and can be brought to a stop again in 3.15 s. Find the acceleration of the sled while ac- celerating. Answer in units of m/...
Tuesday, November 4, 2014 at 7:37pm

physics
Tony Hawk skates down a ramp. If he is moving at 5.4 m/s at the bottom of the ramp and has a mass of 82 kg, how tall was the ramp?
Tuesday, November 4, 2014 at 7:26pm

physics
How fast will a roller coaster, with a mass of 1200 kg, be moving at the bottom of an 18 meter tall hill?
Tuesday, November 4, 2014 at 7:24pm

physics
Bobo jumps out of a plane 2,000 m in the air. If Bobo has a mass of 100 kg, how much kinetic energy will he have after falling for 200 m? Assume no air resistance.
Tuesday, November 4, 2014 at 7:23pm

physics
A team of sled rides has a mass of 180 kg. If they have 8,000 J of kinetic energy at the bottom of the hill, how tall was the hill they just tackled?
Tuesday, November 4, 2014 at 7:22pm

Physics
A wheel is rotating freely with an angular speed of 4840rad/s on a shaft whose moment of inertia is negligible. A second wheel, initially at rest and with 8 times the rotational inertia of the first is suddenly coupled to the same shaft. a) What is the angular speed of the ...
Tuesday, November 4, 2014 at 6:07pm

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
Tuesday, November 4, 2014 at 6:06pm

physics
A 1100- kg car collides with a 1500- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 35 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
Tuesday, November 4, 2014 at 5:45pm

Physics
A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
Tuesday, November 4, 2014 at 5:45pm

physics-distance
Here's a stationary bike. If you pedal such that the front wheel rotates at 6.9 rad/s, and that wheel's radius is half a meter, how far would you have gone in 35 minutes, if the bike where a non-stationary bike? (Assume a constant speed of rotation) I am not sure where...
Tuesday, November 4, 2014 at 5:29pm

physics
Find the height of a cliff if the 87.6 kg cliff diver hits the water at 15.5 m/s.
Tuesday, November 4, 2014 at 5:00pm

physics
A particle undergoes three successive displacement in a plane as follows 4m southwest, 5m east, 6m in a direction 60 degree north of east (a) draw an apropraite vector diagram to represcent the displacement (b) detarmine the displacement that would be required to bring the ...
Tuesday, November 4, 2014 at 4:14pm

physics
A one-piece cylinder is shaped as in the Figure, with a core section protruding from the larger drum. The cylinder is free to rotate around the central axis shown in the drawing. A rope wrapped around the drum, of radius 2.70 m, exerts a force F1 to the right on the cylinder. ...
Tuesday, November 4, 2014 at 4:01pm

Physics- linear acceleration
A wagon, starting from rest has a linear acceleration in the positive x direction of 0.3 m/s2. For the next 19 seconds, the wheels roll without slipping. The radius of each wheel is 37.4 cm. After this time, how many radians has each wheel rotated through?
Tuesday, November 4, 2014 at 3:56pm

physics
A block of mass m = 1.02 kg is suspended above the ground at a height h = 14.4 m by a spool with two arms. The spool-with- arms arrangement is a combination of a solid uniform cylinder of mass M = 3.43 kg and radius R = 0.440 m, and two rods, each of length l = 0.559 m and ...
Tuesday, November 4, 2014 at 3:18pm

physics
Suppose a bimetallic strip is constructed of copper and steel strips of thickness 1.23 mm and length 22.3 mm, and the temperature of the strip is reduced by 6.30 K. Determine the radius of curvature of the cooled strip (the radius of curvature of the interface between the two ...
Tuesday, November 4, 2014 at 3:04pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its ...
Tuesday, November 4, 2014 at 2:51pm

physics
Two masses are connected by a light string passing over a frictionless pulley as shown on Figure. The M2= 6.1 kg mass is released from rest at height h = 2.8 m . We are given that M1=2.7 kg and I, the moment of inertia of the pulley is I = 0.198 kg m2 and its radius is R = 0....
Tuesday, November 4, 2014 at 2:50pm

Physics
A solid sphere of mass 2.07kg rolls up an incline with an inclination angle of 24.40°. At the bottom of the incline, the center of mass of the sphere has a translational speed of 2.80m/s. a) What is in J, the linear kinetic energy of the sphere at the bottom of the incline...
Tuesday, November 4, 2014 at 2:19pm

Physics
A 1100- kg car collides with a 1500- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 35 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...
Tuesday, November 4, 2014 at 2:01pm

Physics
A ball of mass 0.60 kg is fired with velocity 100 m/s into the barrel of a spring gun of mass 2.4 kg initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. No energy is lost to friction. What fraction of ...
Tuesday, November 4, 2014 at 1:08pm

Physics
A 0.145- kg baseball with an initial speed of 27 m/s rebounds with a speed of 32 m/s after being struck with a bat. If the duration of contact between ball and bat was 1.5 ms, what was the magnitude of the average force between ball and bat?
Tuesday, November 4, 2014 at 12:52pm

Physics
What is the momentum (in kg m/s) of a 131- kg football player running at a top speed of 9.9 m/s? What is the momentum of a 9.32- g rifle bullet traveling at 618 m/s
Tuesday, November 4, 2014 at 12:52pm

physics
in passing theough a wooden block 8cm thick the velocity of a beullet reduces from 700m/s to 300 m/s if the mass of the bullet is 10g find the average resitance to penetrate ?
Tuesday, November 4, 2014 at 12:42pm

Physics
A 8.9 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 12.1 N. Find the speed of the block after it has moved 3.3 m. Answer in units of m/s
Tuesday, November 4, 2014 at 12:27pm

Physics
Calculate the ideal gas constant using the moles of air, temperature of air and slope of the air vs. 1/Pressure graph. Moles of air = 4.89*10^-4 Temperature of air = 23C Slope = 2317
Tuesday, November 4, 2014 at 12:25pm

physics
An aluminum vessel with a volume capacity of 510 cm3 is filled with water to the brim at 20.0°C. The vessel and contents are heated heated to 49.9°C. During the heating process, will the water spill over the top (in this case the answer would be positive), will there ...
Tuesday, November 4, 2014 at 12:03pm

physics
Suppose a bimetallic strip is constructed of copper and steel strips of thickness 1.33 mm and length 23.5 mm, and the temperature of the strip is reduced by 4.50 K. If the strip is 23.5 mm long, how far is the maximum deviation of the strip from the straight orientation?
Tuesday, November 4, 2014 at 9:47am

Physics
An aircraft moving horizontally at a speed of 80m/s and at a height of 500m releases a bomb to destroy a tank moving away from it. If the bomb is released when the tank is at a horizontal distance of 600m from the aircraft, find the speed of the tank.
Tuesday, November 4, 2014 at 9:11am

physics
A 1.2 kg tether ball is hit so that it circles the pole with an angular speed of 3 radians/s. The length of the tether is 2m. What is the angle measured from the tether to the vertical pole?
Tuesday, November 4, 2014 at 9:09am

Physics
"Being an athlete takes more brains than brawn. It takes time and effort. It takes endurance and commitment. It takes an athlete who can stay in the air for 2.5 seconds while shooting a goal; an athlete who knows which laws of physics keep him there." Assess the ...
Tuesday, November 4, 2014 at 9:08am

physics
Calculate the PRP, PRF, PD, DF, SPL, wavelength, period, and Axial Resolution if a 2 cycle pulse emitted from a 10 MHz transducer if the echo time received was 0.26 ms in soft tissue.
Tuesday, November 4, 2014 at 6:38am

physics
a50g ball is hit to roll by a force of 100N.it rolls over 20m.what was its initial speed
Tuesday, November 4, 2014 at 4:17am

Physics
what are vector quantities?
Tuesday, November 4, 2014 at 12:38am

physics 1403
10kg mass is attached to a 5kg mass by a 20cm cord. The 5 kg mass is attached by a 30cm cord to a motor that rotates the entire mass/cord system 5rev/s in the horizontal plane. What is the tension in each cord?
Monday, November 3, 2014 at 11:22pm

physics
A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained length. The pellet rises to a maximum ...
Monday, November 3, 2014 at 10:48pm

physics
A horizontal force of 2.0 N is applied to a 1.5 kg cart on a horizontal surface. The coefficient of friction is 0.55. What is the acceleration of the cart given that the cart was originally moving?
Monday, November 3, 2014 at 9:46pm

physics
find the mass of a ball on a roof 30 meters high, if the ball's gravitational energy is 58.8 joules.
Monday, November 3, 2014 at 9:25pm

Physics
A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...
Monday, November 3, 2014 at 8:44pm

Physics
A 5.9 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 12.1 N. Find the speed of the block after it has moved 2.6 m.
Monday, November 3, 2014 at 8:40pm

physics
a 10.0m long bar is attached by a frictionless hing to a wall and held horizontally by a rope that makes an angle of 53 deg with the bar the bar is uniform and weights 39.9 N. how far from the hinge should a 10.0kg mass be suspended for the tension T in the rope to be 125 N
Monday, November 3, 2014 at 8:32pm

Reactor Physics
There is an infinite non-multiplying medium with diffusion length 3 cm and diffusion coefficient 1 cm. There are 3 point sources of neutrons on the x-y plane: „h Source S1 = 108 s-1 at (x, y) = (2 cm, 0) „h Source S2 = 2*108 s-1 at (x, y) = (0, 2 cm) „h Source ...
Monday, November 3, 2014 at 7:56pm

Reactor Physics
Design the smallest cubical uniform nuclear reactor which will have a fission rate at any point not greater than 2.1*1011 fissions.cm-3.s-1 and a fission power not smaller than 2,500 MW. [Neglect the extrapolation distance.]
Monday, November 3, 2014 at 7:52pm

physics
Erica throws a ball out of a window with a horizontal speed of 3.8m/s. If the ball hits the ground 15m away, how high up is the window? My work: X-direction v1x=3.8m/s v2x=3.8m/s a=0m/s2 d=15m y-direction I don't know how to find the initial and final velocity. a=-9.8m/s2 ...
Monday, November 3, 2014 at 7:43pm

physics
A hollow 0.358 kg sphere rolls without slipping down an inclined plane that makes an angle of 41.0o with the horizontal direction. The sphere is released from rest a distance 0.734 m from the lower end of the plane. a. How fast is the hollow sphere moving as it reaches the end...
Monday, November 3, 2014 at 7:41pm

physics
A hollow 0.358 kg sphere rolls without slipping down an inclined plane that makes an angle of 41.0o with the horizontal direction. The sphere is released from rest a distance 0.734 m from the lower end of the plane. a. How fast is the hollow sphere moving as it reaches the end...
Monday, November 3, 2014 at 7:40pm

physics
Please Help The human outer ear contains a more-or-less cylindrical cavity called the auditory canal that behaves like a resonant tube to aid in the hearing process. One end terminates at the eardrum (tympanic membrane), while the other opens to the outside. (See the figure (...
Monday, November 3, 2014 at 7:24pm

Physics
Consider the rods plus disc system shown in the Figure. The rod has a length L =0.50 m, and mass M = 0.270kg. The large disc has a radius of R = 0.130m and mass m=0.810kg. The second disk should be treated as a point mass of 0.405kg. It is glued to the rod at position X = 0....
Monday, November 3, 2014 at 7:22pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
Monday, November 3, 2014 at 7:22pm

PHYSICS
A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
Monday, November 3, 2014 at 7:04pm

PHYSICS
A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
Monday, November 3, 2014 at 7:03pm

Physics
A circular coil (660 turns, radius = 0.037 m) is rotating in a uniform magnetic field. At t = 0 s, the normal to the coil is perpendicular to the magnetic field. At t = 0.024 s, the normal makes an angle of 45o with the field because the coil has made one-eighth of a ...
Monday, November 3, 2014 at 7:02pm

Physics 11U
At the moment when a shot putter releases a 5.00 kg shot, the shot is 2.00 m above the ground and travelling at 15.0 m/s. It reaches a maximum height of 8.0 m above the ground and then falls to the ground. Assume air resistance is negligible. a) What was the velocity of the ...
Monday, November 3, 2014 at 6:43pm

physics
car doing 60 mph and skids for 52.3 meters what is the speed at end of skid co/friction is 0.693 urgent help please
Monday, November 3, 2014 at 6:35pm

Physics
A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...
Monday, November 3, 2014 at 6:22pm

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
Monday, November 3, 2014 at 5:58pm

physics
Please help I cant breath with this qn, due today exam pending, thanks for taking your time to help. The human outer ear contains a more-or-less cylindrical cavity called the auditory canal that behaves like a resonant tube to aid in the hearing process. One end terminates at ...
Monday, November 3, 2014 at 5:55pm

Physics (heat)
A coal sample yields 1.25 X 10^4 Btu/lb. How many foot-pounds of work result from burning 1.00 ton of this coal?
Monday, November 3, 2014 at 5:35pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
Monday, November 3, 2014 at 5:32pm

physics
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 72.7 N, Jill pulls with 79.9 N in the northeast direction, and Jane pulls to the southeast with 103 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
Monday, November 3, 2014 at 5:20pm

Physics
A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...
Monday, November 3, 2014 at 5:17pm

Physics
A moving object has a kinetic energy of 182 J and a momentum with magnitude of 27.6 kg·m/s. (a) Determine the mass of the object. kg (b) Determine the speed of the object. m/s
Monday, November 3, 2014 at 4:43pm

Physics
A 73.5 kg ice skater moving to the right with a velocity of 2.97 m/s throws a 0.21 kg snowball to the right with a velocity of 29.3 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
Monday, November 3, 2014 at 4:27pm

Science Physics
A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?
Monday, November 3, 2014 at 4:15pm

physics
A disk with mass m = 8.1 kg and radius R = 0.33 m begins at rest and accelerates uniformly for t = 18 s, to a final angular speed of ω = 34 rad/s. What is the angular acceleration of the disk? What is the angular displacement over the 18 s? What is the moment of inertia ...
Monday, November 3, 2014 at 3:40pm

Physics
A beaker of mass 5kg containing oil of mass 17.4 kg and density 8.5 x102kg/m3 rests on the scale A block of iron of mass 6.7kg is suspended from the spring scale and completely submerged in the oil as shown in Figure below. Determine the equilibrium readings of lower scale in ...
Monday, November 3, 2014 at 2:17pm

physics
Which parameter of a projectile depends on the horizontal as well as the vertical component of velocity of projection?
Monday, November 3, 2014 at 2:12pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
Monday, November 3, 2014 at 1:41pm

physics
The wheels, axle, and handles of a wheelbarrow weigh 60.0 N. The center of gravity of the wheelbarrow alone is 0.600 m from the axel. The distance from the axle to the hands of the operator is 1.3 m. The force applied by the operator to the end of the handles is 250 newtons. ...
Monday, November 3, 2014 at 1:16pm

physics
The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates through its geometric...
Monday, November 3, 2014 at 1:08pm

physics
A clock has a brass pendulum with a period of 1.000 s at 18.9°C. Suppose the clock is moved to a location where the average temperature is 33.1°C. How much time will the clock lose or gain in 6 days?
Monday, November 3, 2014 at 12:03pm

physics
An aluminum vessel with a volume capacity of 530 cm3 is filled with water to the brim at 20.0°C. The vessel and contents are heated heated to 42.5°C. During the heating process, will the water spill over the top (in this case the answer would be positive), will there ...
Monday, November 3, 2014 at 12:02pm

physics
A 15.0-gal container is filled with gasoline. Neglect the change in volume of the container and find how many gallons are lost if the temperature increases by 31.9°F. The volume expansion coefficient of gasoline is 9.60·10-4°C-1
Monday, November 3, 2014 at 12:02pm

physics
On a cool morning, with the temperature at 9.1 °C, a painter fills a 5-gal container to the brim with turpentine. When the temperature reaches 27.1 °C, how much fluid spills out of the container? The volume expansion coefficient for this brand of turpentine is 7.7&...
Monday, November 3, 2014 at 12:00pm

physics
A 750-N physics student carries a 4.0 meter board, uniform in shape, and 190 newtons in weight to our swimming pool. The student then places the board on the deck and next to the pool in such a way so 1.5 meters of the board extends out over the edge of the pool. How far, in ...
Monday, November 3, 2014 at 11:31am

Physics
mass of 2 kg is released from rest at the top of the inclined plane shown below. at bottom speed is 5 m/s how much work was done by friction between incline and mass
Monday, November 3, 2014 at 8:29am

Physics
3.2 kg block is given an initial velocity of 12 m/s across horizontal surface. after travels 8 m speed is 2.4 m/s. determine coefficient of friction bewern block and surface and how far it travels before coming to rest
Monday, November 3, 2014 at 8:28am

Physics
A person walks 10.4 degrees north of east for 4.19 km. Another person walks due north, then due east to arrive at the same location. How far would this person walk due east? Answer in units of km
Monday, November 3, 2014 at 2:47am

Physics
A person walks 10.4 degrees north of east for 4.19km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km.
Monday, November 3, 2014 at 2:45am

physics
which of acceleration age speed temperature and velocity are vector quantities
Monday, November 3, 2014 at 2:41am

physics
A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N,
Monday, November 3, 2014 at 2:16am

Physics
A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of its horizontal component? Answer in units of N.
Sunday, November 2, 2014 at 11:20pm

AP Physics 1
A cat climbs 8m directly up a tree. What is the horizontal component of the cat's displacement? Answer in units of m.
Sunday, November 2, 2014 at 11:13pm

Physics
Repairing a spaceship CJ drops a hammer and it took .68 s to fall .90 m to the ground. What is the magnitude of the gravitational accerleration on mars
Sunday, November 2, 2014 at 11:00pm

physics
The red box has a mass of 20.1 kg and the blue box has a mass of 14.5 kg and the force is 290 N. To the nearest tenth of a m/s2 what is the acceleration of the combination? The diagram looks like this: F --> [Red Box][Blue Box] On a straight plane, not on an incline.
Sunday, November 2, 2014 at 9:37pm

Physics
The 56 kg man in the roller coaster car is sitting on a bathroom scale. If he is traveling at 40.9 m/s at the point shown and the radius of the vertical coaster track is 87 meters, to the nearest newton what does the scale read? What is the answer to the previous problem if ...
Sunday, November 2, 2014 at 9:08pm

physics
A marble rolls off the edge of a table that is 0.82 m high. The marble is moving at a speed of 0.11 m/s at the moment that it leaves the edge of the table. How far from the table does the marble land?
Sunday, November 2, 2014 at 8:54pm

physics
Arann launches a rock into the air such that it rises 20.0 m in the first third (time wise) of its ascent to maximum height. Determine the rock's maximum height and launch speed. Determine the time(s) at which the ball is at a height of 10m. PLEASE HELP
Sunday, November 2, 2014 at 8:31pm

Physics
A 1000 kg Toyota, initially traveling at 40 mph, collides into the rear end of a 2000 kg Cadillac, initially stopped at a red light. The bumpers lock and the two cars skid for 2 seconds before coming to rest. Calculate the coefficient of kinetic friction between the tires and ...
Sunday, November 2, 2014 at 7:51pm

Physics (projectile motion)
Projectile fired in earths gravitational field at a height of of 0.90m above ground level, with a horizontal velocity of 9m/s. How far will the ball fly before hitting the ground? How long will the ball stay in the air?
Sunday, November 2, 2014 at 7:46pm

Physics
Hi I see another student actually posted this question... but got no answer... is someone able to look at it? see below - a bullet is fired at and passes a piece of target paper suspended by a massless string. The bullet has a mass of m, a speed v before the collision with the...
Sunday, November 2, 2014 at 7:46pm

physics
A remote-controlled car’s wheel accelerates at 22.6 rad/s2. If the wheel begins with an angular speed of 10.6 rad/s, what is the wheel’s angular speed after exactly three full turns?
Sunday, November 2, 2014 at 7:42pm

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