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January 25, 2015

January 25, 2015

**Recent Homework Questions About Physics**

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**Physics Help Please! Check the answer**

an athlete stretches a spring an extra 40.0 cm. how much energy has he transferred to the spring, if the spring constant is 5286.0 N/m? Us= 1/2kx^2 =1/2(5286.0)(.40)=1057.2 J Thanks!
*Thursday, November 6, 2014 at 8:45pm*

**physics**

A hiker begins a trip by first walking 25.0 km southeast from her base camp. On the 2nd day, she walks 40.0 km in a direction 600 north of east, at which point she discovers a forest rangers tower. Find the magnitude and direction of displacement from base camp.
*Thursday, November 6, 2014 at 8:42pm*

**physics**

For the ballistic missile aimed to achieve the maximum range of 15500 km, what is the maximum altitude reached in the trajectory? Answer in units of km
*Thursday, November 6, 2014 at 8:30pm*

**Physics**

Your friend Josh tells you that he spends less on gas in the winter than in the summer. He also says that he has to fill up his tank less often in the winter. (a) Which of the following are possible hypotheses that can be formed from Josh’s observations? (You can choose ...
*Thursday, November 6, 2014 at 8:21pm*

**physics**

An artillery shell is fired at an angle of 86◦ above the horizontal ground with an initial speed of 1630 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min
*Thursday, November 6, 2014 at 8:13pm*

**physics**

An 11.8 g bullet leaves the muzzle of a rifle with a speed of 578.5 m/s. What constant force is exerted on the bullet while it is traveling down the 0.6 m length of the barrel of the rifle? Answer in units of N
*Thursday, November 6, 2014 at 8:13pm*

**physics**

A pelican flying along a horizontal path drops a fish from a height of 3.3 m. The fish travels 7.6 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s
*Thursday, November 6, 2014 at 8:02pm*

**physics**

A constriction in a pipe reduces its diameter from 7.9 cm to 1.8 cm . Where the pipe is wider, the fluid velocity is 8 m/s. Find the fluid velocity where the pipe is narrow. Answer in units of m/s
*Thursday, November 6, 2014 at 7:25pm*

**physics**

A circular swimming pool has a flat bottom and a 4.39 m diameter. It is filled with water to a depth of 1.51 m. There is 1.36 atm of pressure on the top surface.
*Thursday, November 6, 2014 at 7:17pm*

**physics**

What force F must be applied to the small piston to maintain the load of 49 kN at a constant elevation?
*Thursday, November 6, 2014 at 7:09pm*

**physics**

If the average gauge pressure in the vein is 14400 Pa, what must be the minimum height of the bag in order to infuse glucose into the vein? Assume that the specific gravity of the solution is 1.05. The acceleration of gravity is 9.8 m/s
*Thursday, November 6, 2014 at 6:57pm*

**physics**

A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction
*Thursday, November 6, 2014 at 6:50pm*

**physics**

A 73 kg man in a 4.3 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 1.5 cm. Find the pressure exerted on the floor by each leg. The acceleration of gravity is 9.8...
*Thursday, November 6, 2014 at 6:35pm*

**physics**

A 15 kg rock is horizontally from very high cliff at a speed of 65m/s. what is the speed of the rock after it has fallen a vertical distance of 35m?
*Thursday, November 6, 2014 at 6:10pm*

**Physics**

A. You drag a suitcase of mass 19 kg with a force of F at an angle 41.3 degrees with respect to the horizontal along a surface with kinetic coefficient of friction 0.54. The acceleration due to gravity is 9.8 m/s^2. What is the normal force on the suitcase? Answer in units of ...
*Thursday, November 6, 2014 at 4:08pm*

**physics**

The half-life of Th(227) is 18.72 days. It decays by alfa emission to Ra(223), an alfa emitter whose half-life is 11.43 days. A particular sample contains 10^6 [10E(+6)] atoms of Th(227) and no Ra(223) at time t=0. a) How many atoms of each type will be in the sample at t=15 ...
*Thursday, November 6, 2014 at 3:51pm*

**Physics**

41. A student pulls horizontally on a 12 kg box, which then moves horizontally with an acceleration of 0.2 m/s^2. If the student uses a force of 15 N, what is the coefficient of kinetic friction of the floor? Okay, so I know that the net force is 15 and the box weighs 12 kg. I...
*Thursday, November 6, 2014 at 3:25pm*

**Hurricane Project for Physics Class**

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
*Thursday, November 6, 2014 at 3:07pm*

**Physics**

An Escort and a Camaro traveling at right angles collide and stick together. The Escort has a mass of 1200 kg and a speed of 25 km/h in the positive x direction before the collision. The Camaro has a mass of 1700 kg and was traveling in the positive y direction. After the ...
*Thursday, November 6, 2014 at 2:21pm*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*Thursday, November 6, 2014 at 1:51pm*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*Thursday, November 6, 2014 at 1:50pm*

**physics**

What is the maximum speed that the car can turn in a curve of radius 29.0 m without slipping? The coefficient of static friction between a road and a car's tires is 0.500, and the coefficient of kinetic friction is 0.390. Assume that the road is horizontal and flat.
*Thursday, November 6, 2014 at 1:44pm*

**Physics**

I have a blue liquid with density 1040 +- 20 yellow liquid 1190 +- 60, (dark)red liquid 1170 +- 30 pink/light red liquid 1100 +- 60 my task is to find out what liquids are they all of the densities were calculated in class(we were doing an experiment).
*Thursday, November 6, 2014 at 1:35pm*

**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 ...
*Thursday, November 6, 2014 at 1:32pm*

**physics (work/nonconservative forces)**

An object moving along a horizontal track collides with and compresses a light spring (which obeys Hooke's Law) located at the end of the track. The spring constant is 47.3 N/m, the mass of the object 0.230 kg and the speed of the object is 1.80 m/s immediately before the ...
*Thursday, November 6, 2014 at 1:19pm*

**physics**

How many joules of heat are required to melt 20.0 kg of ice at 0°C?
*Thursday, November 6, 2014 at 1:11pm*

**physics**

if a load 1kg streches a cordby 1.2cm.what is the force constantof the cord?
*Thursday, November 6, 2014 at 1:04pm*

**Physics**

Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a). (a+b)/2 (b). √...
*Thursday, November 6, 2014 at 12:50pm*

**Physics**

Can someone, please help me out with this question. A uniform rectangular 91.21 kg refrigerator with height h = 2.069 m and width w = 1.153 m is pushed at a constant velocity across a level floor. The refrigerator is pushed in the horizontal direction halfway between the floor...
*Thursday, November 6, 2014 at 12:00pm*

**physics**

A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 125mm . At the very bottom, the normal force on the driver is twice his weight.
*Thursday, November 6, 2014 at 11:58am*

**physics**

Daneil is bouncing on a trampoline. After a certain bounce he leaves the ground traveling at a speed of 2.54 m/s. How far into the air does he go? I need helllpppp I'm so bad a physics, I need to know what formula to use..
*Thursday, November 6, 2014 at 11:16am*

**Physics**

Explain how you would determine how much error there is between a vector addition and the real results.
*Thursday, November 6, 2014 at 9:16am*

**Physics**

1) What are the possible effects of a warming climate and rising sea levels on the number, intensity, and effects of hurricanes?
*Thursday, November 6, 2014 at 7:23am*

**Physics**

1) Please describe the structure of a hurricane,and how they work. Include a discussion of how energy is transferred from the warm ocean water up to the sky.
*Thursday, November 6, 2014 at 7:17am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding to 25 km/h . If the average speed increases to 40 km/h. What is time he will gain from his journey
*Thursday, November 6, 2014 at 7:10am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding 25 km/h. If the average speed increases to 40 km/h, fine the time he will gain in his journey
*Thursday, November 6, 2014 at 7:05am*

**Physics**

1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
*Thursday, November 6, 2014 at 6:59am*

**physics**

A motorist has to travel 3.50 km in a city with an average speed not exceeding 25 km/h. If the average speed increases to 40 km/h, find the time he will gain in his journey.
*Thursday, November 6, 2014 at 6:30am*

**College physics**

In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T(in) = 20 degrees celcius and the temperature outside is T(out) = 0 degrees celcius. The walls have fiberglass insulation, which dominates the heat conduction ...
*Thursday, November 6, 2014 at 3:40am*

**physics**

48 kg projectile is fired at an angle of 30 degree above the horizontal with an initial speed of 1.34 x10^2m/s fro the top of a cliff 150m above level ground, where the ground is taken to be y=0 what is the inital total mechanical energy of the projectile?'
*Thursday, November 6, 2014 at 1:55am*

**physics**

'a 48 kg projectile is fired at an angle of 30 degree above the horizontal with an initial speed of 1.34 x10^2m/s fro the top of a cliff 150m above level ground, where the ground is taken to be y=0 what is the inital total mechanical energy of the projectile?'
*Thursday, November 6, 2014 at 1:54am*

**physics**

A watermelon falls off of a balcony 14 meters high. How fast is it moving immediately before it reaches the ground? a increases with time b is 0 m/s c remains constant d decreases with time
*Wednesday, November 5, 2014 at 11:58pm*

**Physics**

A rubber ball with a mass of 0.130 kg is dropped from rest. From what height was the ball dropped, if the magnitude of the ball's momentum is 0.710 kg · m/s just before it lands on the ground?
*Wednesday, November 5, 2014 at 11:52pm*

**physics**

A cat slides off the table. Immediately before the cat leaves the table,what is the vertical velocity?
*Wednesday, November 5, 2014 at 11:33pm*

**Science, Physics**

A 800kg safe is 2.3m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 52cm.What is the spring constant of the spring?
*Wednesday, November 5, 2014 at 11:08pm*

**Chemistry Physics**

A steel pipe 8.25 m long is installed at 45°C. Find the decrease in length when coolants at -60°C pass through the pipe
*Wednesday, November 5, 2014 at 10:37pm*

**physics**

A ball is shot out of a spring and into a hollow ballast which then swings upwards 2.5 cm. The ball has a mass of 0.10 kg, the ballast has a mass of 0.50 kg and the spring constant is 500 N/m. How fast was the ballast-ball system moving immediately after impact? How fast was ...
*Wednesday, November 5, 2014 at 10:19pm*

**physics**

A 1000 kilogram car rolling on a horizontal surface has speed v= 45 kilometer per hour when it strikes a horizontal coil spring and is brought to rest in a distance of 2.2 meters. What is the spring stiffness constant of the spring?
*Wednesday, November 5, 2014 at 9:31pm*

**Physics**

A block of mass 0.45 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 18 N/m. The block is pulled 38 cm and let go. a)What is its maximum speed? b)What is its speed when the extension is 30 cm? c)At what position ...
*Wednesday, November 5, 2014 at 9:24pm*

**Physics**

a point 22 caliber rifle fires a 1.8 gram bullet at a 400m/s into a block of wood. If the bullet penetrates to a depht of 10cm find the desaceleration of the bullet. The force exerheted on the bullet, and the time.
*Wednesday, November 5, 2014 at 9:21pm*

**Physics Science**

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C? so its setup like (20*1.00)*(90-50)+(20*1.00)*(90-50) = 1600g?
*Wednesday, November 5, 2014 at 9:16pm*

**Physics Help Please!**

A block of mass is moving along the horizontal frictionless surface with a speed of 5.70 m/s. If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? Show step by step please! ...
*Wednesday, November 5, 2014 at 8:04pm*

**Physics**

An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far will it drop before ...
*Wednesday, November 5, 2014 at 7:35pm*

**physics **

how do I solve for angular momentum if the weight its 700 g and the angular v is (1m=r, 120rmp). I get 12.56 for the v. But i don't know how to solve for the monentum. Also is my v correct?
*Wednesday, November 5, 2014 at 7:22pm*

**Physics**

A mass of 2.0kg traveling at 3.0 m/s along a horizontal plane hits a relaxed spring 20cm away from it. The coefficient of kinetic friction is 0.3. The mass is slowed to zero velocity when the spring has been compressed. By how much the spring has been compressed, the spring ...
*Wednesday, November 5, 2014 at 7:21pm*

**Physics**

A large flatbed truck hauls a heavy wood crate as shown. The crate is not tied down and simply rests on the metal bed of the truck. Find the maximum acceleration the truck can have if the crate is not to slide along the truck bed. (Static friction is 0.5 and kinetic friction ...
*Wednesday, November 5, 2014 at 7:21pm*

**Physics **

A girl coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.7 m/s. The coefficient of kinetic friction between runners and snow is 0.038, and the girl and sled together weigh 603 N. The acceleration of gravity is 9.8 m/s2 . How far does the ...
*Wednesday, November 5, 2014 at 7:14pm*

**Physics**

A simple pendulum of length 2.00m is made with a mass of 2.00kg. The mass has speed of 3.00 m/s when the pendulum is 30 degrees above its lowest position. -What is the maximum angle away from the lowest position the pendulum will reach? -What is the speed of the mass when the ...
*Wednesday, November 5, 2014 at 7:12pm*

**physics**

Two blocks connected by a string are pulled across a rough horizontal surface by a force applied to one of the blocks, as shown. The acceleration of gravity is 9.8 m/s Block 1 has a mass of 5 kg while block two has a mass of 8 kg. A string is tied to the 8 kg block pulling up ...
*Wednesday, November 5, 2014 at 6:59pm*

**physics**

A man skis down from the top of a hill 1500.0 m high, starting from rest. If he loses 50% of his initial mechanical energy to friction during his descent, what is his speed in m/s at the base of the hill?
*Wednesday, November 5, 2014 at 6:35pm*

**physics**

A 74.0 kg ice skater moving to the right with a velocity of 2.14 m/s throws a 0.12 kg snowball to the right with a velocity of 24.2 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...
*Wednesday, November 5, 2014 at 6:25pm*

**Chemistry Physics**

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?
*Wednesday, November 5, 2014 at 6:10pm*

**Physics Science**

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?
*Wednesday, November 5, 2014 at 5:56pm*

**physics**

A 22-N force, parallel to the incline, is required to push a certain crate at a velocity of 6.1 up a frictionless incline that is 55° above the horizontal. The mass of the crate is:
*Wednesday, November 5, 2014 at 5:54pm*

**Physics**

A 250 g piece of tin at 99°C is dropped in 100 g of water at 10°C. If the final temperature of the mixture is 20°C, what is the specific heat of the tin?
*Wednesday, November 5, 2014 at 5:47pm*

**Physics**

A runner moving at a speed of 7.7 m/s rounds a bend with a radius of 21 m. What is the centripetal acceleration of the runner? My teacher doesn't explain anything very well and I don't understand how to figure it out.
*Wednesday, November 5, 2014 at 5:42pm*

**physics **

A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 25 m/s. The third piece has twice the mass as the other two. 1. What is the speed of the third piece? 2. What is the direction of ...
*Wednesday, November 5, 2014 at 5:09pm*

**physics **

no idea how to do this problem A kid at the junior high cafeteria wants to propel an empty milk carton along a lunch table by hitting it with a 3.0g spit ball. If he wants the speed of the 40g carton just after the spit ball hits it to be 0.30 m/s, at what speed should his 3.0...
*Wednesday, November 5, 2014 at 5:08pm*

**Physics - Method Of Mixtures**

Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
*Wednesday, November 5, 2014 at 5:02pm*

**Physics Science**

Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
*Wednesday, November 5, 2014 at 4:59pm*

**physics **

A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70 kg , and the mass of the bullet is 10 g If the bullet leaves the muzzle at a speed of 500 m/s, what is the final speed of the man?
*Wednesday, November 5, 2014 at 4:46pm*

**physics **

A small, 250\g cart is moving at 1.50m/s on a frictionless track when it collides with a larger, 4.00kg cart at rest. After the collision, the small cart recoils at 0.890m/s . What is the speed of the large cart after the collision?
*Wednesday, November 5, 2014 at 4:44pm*

**physics **

In a Little League baseball game, the 145 g ball enters the strike zone with a speed of 13.0 m/s. The batter hits the ball, and it leaves his bat with a speed of 21.0 m/s in exactly the opposite direction. 1. what is the magnitude of the impulse delivered by the bat to the ...
*Wednesday, November 5, 2014 at 4:40pm*

**physics **

An ice hockey puck slides along the ice at 15 m/s . A hockey stick delivers an impulse of 4.8kg/m/s causing the puck to move off in the opposite direction with the same speed. what is the mass of the puck?
*Wednesday, November 5, 2014 at 4:35pm*

**Physics**

If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures Is this correct? 0.86*648*9.8= 5...
*Wednesday, November 5, 2014 at 4:11pm*

**Physics**

If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures am I doing this right? 648*.68=440
*Wednesday, November 5, 2014 at 3:21pm*

**physics**

Speed in air is 340m.s Siren of ambulance emits waves of frequency 980Hz A detector at the scene measures the frequency as 1050Hz h0w d0 I w0rk this 0ut 1050 = 340 / 340 - vs (980) 1050 = 1 - vs (980) 1050 = -vs (980) 1050 + vs = 980 1050/1050 + vs = 980 / 1050 vs = 980 / 1050...
*Wednesday, November 5, 2014 at 2:51pm*

**physics**

A 755 N diver drops from a board 10.0m above the water's surface.Find the diver's speed 5.00 m above the water's surface. Then find the diver's speedjust before striking the water.
*Wednesday, November 5, 2014 at 2:18pm*

**physics**

If a 648 N body on a carpeted surface has a μs of 0.86 and a μk of 0.68, what amount of force will be required to start dragging the body across the floor? Make sure to report your answer with the correct number of significant figures
*Wednesday, November 5, 2014 at 2:11pm*

**physics**

A staging that weighs Wstaging supports a painter weighing 350 N. The reading on the left scale is 600 N and the reading on the right scale is 240 N. What is the weight of the staging?
*Wednesday, November 5, 2014 at 12:10pm*

**physics **

What is the work done by the two forces together in moving an object a distance of d = 5 m as shown in the diagram? The magnitude of each force is 19 N. Diagram: (The two forces, F1 and F2, have the same magnitud but F1 is 45º over de the x axis, and F2 is 45º below ...
*Wednesday, November 5, 2014 at 11:29am*

**physics **

The rope of a swing is 3.1 m long. Calculate the angle from the vertical at which a 77-kg man must begin to swing in order to have the same kinetic energy at the bottom as a 1430-kg car moving at 1.05 m/s (2.35 mi/hr).
*Wednesday, November 5, 2014 at 11:22am*

**physics **

A parachutist descends vertically a distance of 380 m at a constant speed of 2.9 m/s. The mass of the parachutist is 70 kg. What is the work done on the parachutist by the net force during this descent?
*Wednesday, November 5, 2014 at 11:20am*

**Physics**

Half life of radium is 44 years.The sample will reduce to 50% of its orignal value ater how many years?
*Wednesday, November 5, 2014 at 9:30am*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 73.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*Wednesday, November 5, 2014 at 9:18am*

**physics**

A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.791 m2 and is at 2.95·102 K. What is the rate at...
*Wednesday, November 5, 2014 at 9:18am*

**physics**

An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5°C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to ...
*Wednesday, November 5, 2014 at 9:17am*

**physics**

A copper sheet of thickness 2.13 mm is bonded to a steel sheet of thickness 1.41 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 24.3°C. a) Determine the temperature (in °C) of the copper-steel interface. b) ...
*Wednesday, November 5, 2014 at 9:16am*

**Physics**

someone please answer these Physics Q answers no explanation 1 What is the opposite force to gravity 2 an example of a contact force 3 an example of a non-contact force 4 What effect does ‘mass’ have on inertia 5 two examples of forces that could slow an object down ...
*Wednesday, November 5, 2014 at 7:28am*

**physics**

A truck moves with a constant acceleration and covers a distance between two points 180 apart in 10 seconds. The velocity as it passes the second point is 30 m/s. Whats the acceleration of the truck ? whats the velocity in the first point ?
*Wednesday, November 5, 2014 at 5:53am*

**physics**

the speed of a train is reduced uniformly from 10 m/s to 5 m/s while covering a distance of 150 m. What is the acceleration of the train? how much farther will it travel before coming to rest, assuming the same acceleration ?
*Wednesday, November 5, 2014 at 5:24am*

**pe**

"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 ...
*Wednesday, November 5, 2014 at 1:49am*

**physics**

while cruising along dark stretch of highway at a speed of 25 m/s you see that bridge ahead has been washed out. you apply the breaks to and come to a stop in 4.0 sec construct the position vs time graph and acceleration vs time graph and motion graph for 4 sec interval
*Wednesday, November 5, 2014 at 12:04am*

**physics**

a motorcycle wants to jump a ditch 4m wide. he leaves one side on a ramp that slopes up at 30 above horizontal. he lands at the same elevation at which he took off. his front wheel leaves the ground 2m before the edge of the ditch and comes down 3 m past the far side of the ...
*Tuesday, November 4, 2014 at 11:41pm*

**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*

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