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August 30, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
the binding energy of a nucleus is 240.0 MeV. What is the mass defect of the nucleus in atomic mass units?
Monday, April 14, 2014 at 4:29pm

Physics
An object is 14 cm in front of a diverging lens that has a focal length of -7.9 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.9?
Monday, April 14, 2014 at 4:26pm

Physics
A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?
Monday, April 14, 2014 at 3:56pm

Physics
Last question i'm stuck on please help me through this. Five waves pass a dock in 2.0 s. If the waves are traveling at 10.0 m/s, then what is the wavelength of the waves?
Monday, April 14, 2014 at 1:50pm

Physics
A cue ball collides with two other snooker balls and comes to a complete stop. The angles between the centres at the point of collision are shown below. If the velocity of the incoming cue ball is 5 m/s, determine the velocities of all moving balls after the collision.
Monday, April 14, 2014 at 1:32pm

Physics
A cargo plane is flying horizontally at an altitude of 10000m with a velocity of 800km/h when a cargo pallet falls out the back ramp. (i) How long does it take to fall to the ground? (ii) How far horizontally is the pallet from where it fell off when it hits the ground? (iii) ...
Monday, April 14, 2014 at 1:25pm

physics
Four identical masses of mass 800kg each are placed at the corners of a square whose side lengths are 15.0cm . What is the magnitude of the net gravitational force on one of the masses, due to the other three?
Monday, April 14, 2014 at 12:38pm

Physics
Help me please I'm stuck on this question 2.In a thunderstorm at 20.0°C, Karen sees a bolt of lightning and hears the thunderclap 3.00 s later. How far from Karen did the lightning strike? Show your work.
Monday, April 14, 2014 at 12:33pm

Physics
A radar sends out a sound wave of 1.50 Mhz and senses it again from a moving car at a 1.40 Mhz. What is the speed of the car ?
Monday, April 14, 2014 at 8:17am

physics
A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?
Monday, April 14, 2014 at 4:26am

Physics
An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
Monday, April 14, 2014 at 3:24am

Physics
Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?
Monday, April 14, 2014 at 3:21am

physics
1. A car travels down a straight, flat, level road. Initially, the car is traveling at 80.0 km/hr Northward . After traveling 0.50 0 km , the car is traveling at 95 .0 km/hr. What is the magn i tude of the car ’ s acceleration during this interval ?
Monday, April 14, 2014 at 1:09am

physics
The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right edge, and the force ...
Monday, April 14, 2014 at 12:56am

physics 1
A person is sitting with one leg outstretched and stationary, so that it makes an angle of 30.0° with the horizontal, as the drawing indicates. The weight of the leg below the knee is 50.5 N, with the center of gravity located below the knee joint. The leg is being held in...
Sunday, April 13, 2014 at 9:43pm

physics
A small object is attached to the end of a horizontal spring at position x = 0. It is the pulled to position x = A and released. In one full cycle of its motion, the total distance traveled by the object is...
Sunday, April 13, 2014 at 8:58pm

Physics
Can someone help with the following physics problem? This is the only one I'm having trouble solving. Thanks. A 3.6-m-long ladder leans against a frictionless wall as shown in the figure below. The coefficient of static friction between the ladder and the floor is 0.30. ...
Sunday, April 13, 2014 at 12:30pm

Health Physics
1. Two blocks of mass 0.1 kg and 0.2 kg approach each other on a frictionless surface at velocities of 0.4 and 1 m/s respectively. If the blocks collide and remain together, calculate their joint velocity after the collision. 2. A cyclotron produces a 100-μA beam...
Sunday, April 13, 2014 at 11:18am

physics grade 10 icse
two balls of masses in ratio 1:2 are dropped from the same height find : a. the ratio between their velocities when they strike the ground and b. the ratio of the forces acting on them during motion
Sunday, April 13, 2014 at 12:21am

Physics 141
A 71-kg skier is going down a slope oriented 37° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.
Saturday, April 12, 2014 at 11:52pm

Physics
Which of the following is the equation of the circle with centre (-1.5, 0.5) and radius 3? A. 2x^2 + 6x + 2y^2 - 2y - 13 = 0 B. 2x^2 - 6x + 2y^2 + 2y - 13 = 0 C. 2x^2 - 6x + 2y^2 - 2y - 13 = 0 D. 2x^2 + 6x + 2y^2 - 2y - 23 = 0 E. @x^2 + 6x + 2y^2 - 2y -14 = 0
Saturday, April 12, 2014 at 11:45pm

Physics
A man of mass 75 kg lies on a bed of 10,000 nails. The tip of each nail has an area of 1.0 square millimeter. What pressure does the man experience? [g=10 N/kg]
Saturday, April 12, 2014 at 3:04pm

Physics
5.00 kg of some liquid at 10.0 oC is mixed with 1.00 kg of the same liquid at 40.0 oC. what is the final equilibrium temperature? ignore any heat flow with the containers and/or surroundings
Saturday, April 12, 2014 at 1:44pm

physics
In one type of mass spectrometer, ions having the same velocity move through a uniform magnetic field. The spectrometer is being used to distinguish 12C+ and 14C+ ions that have the same charge. The 12C+ ions move in a circle of diameter 25 cm. (a) What is the diameter of the ...
Saturday, April 12, 2014 at 12:41pm

physics
A cylindrical conductor of radius carries a uniformly distributed current I. Show that the magnetic field within the conductor measured at a distance r from the center is given by the following equation... B= (u0Ir)/2pi a^2
Saturday, April 12, 2014 at 12:38pm

Physics
An object of mass 50 g floats in a liquid of density 2.5 g/ml. When the object is placed in a liquid of density 2.0 g/ml, it sinks to the bottom of the container. What is the force that the object exerts on the bottom of the container? [g = 10m/s^2 = 10N/kg]
Saturday, April 12, 2014 at 2:11am

Physics (Rotation)
In the figure, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...
Saturday, April 12, 2014 at 12:43am

College Physics
A uniform stationary ladder of length= 5.1 m and mass= 15 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. The coefficient of static friction between floor and ladder is μ = 0.41. The ladder makes an angle θ = 51° ...
Friday, April 11, 2014 at 10:00pm

physics
A block is attached to a horizontal spring and set in simple harmonic motion, as shown in the figure. At what point in the motion is the speed of the block at its maximum? The position of the block when the spring is relaxed is marked by x = 0, and the extremes of the block\&#...
Friday, April 11, 2014 at 8:05pm

physics
An object-–spring system undergoes simple harmonic motion. If the mass of the object is doubled, what will happen to the period of the motion?
Friday, April 11, 2014 at 8:01pm

Physics
A uniform bar length of 2.0m and weight 1000 N has its center of gravity at its center. The bar is pivoted 0.5m from the right, and supports a weight of 200N on the opposite end (left end). What is the weight needed at right end of the bar to balance the bar?
Friday, April 11, 2014 at 5:18pm

Physics Energy
How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?
Friday, April 11, 2014 at 4:16pm

Physics
A cannon launches a ball with the initial speed of 210 m/s at a 70 degree angle. 1. How high will the cannonball go? 2. If the cannonball has a mass of 25kg how much work does it take to launch the cannonball to that height?
Friday, April 11, 2014 at 3:06pm

Physics
Standing at the edge of a cliff 240 m tall. You throw a ball into the air one directly upward at 5 m/a and another downward at -5 m/s. Use conservation energy to show that they will have the same speed at the bottom. I know I have to do it twice.. And it should seem simple. I...
Friday, April 11, 2014 at 2:56pm

Physics
A wheel with a weight of 395N comes off a moving truck and rolls without slipping along a highway. At the bottom of a hill it is rotating at an angular velocity of 23.0rad/s . The radius of the wheel is 0.607m and its moment of inertia about its rotation axis is 0.800 MR2. ...
Friday, April 11, 2014 at 1:25pm

Physics
A space probe is traveling in outer space with a momentum that has a magnitude of 7.84 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.29 x 106 N and a direction opposite to the probe's motion. ...
Friday, April 11, 2014 at 11:09am

Physics
Two forces FA and FB are applied to an object whose mass is 9.53 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.43 m/s2. However, when FA points due east and FB points due west, the acceleration is 1.28 m/s2, due...
Friday, April 11, 2014 at 9:12am

physics
A 0.527 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger, and comes to rest some distance above the plunger. The plastic tube has an inner radius of 7.07 mm, and is frictionless. Neither the plunger nor...
Friday, April 11, 2014 at 12:06am

physics
Given that the small piston has a radius of 0.0330 meters^2 and the large piston has a radius of 4.00 meters^2. (a) What force will the large piston provide if the small piston is pushed down with a force of 17.0 N?. (b) If the small piston is slowly depressed a distance of y1...
Thursday, April 10, 2014 at 11:05pm

physics
Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth(Figure 1) : An oak barrel with a lid of area 0.17m2 is filled with water. Along, thin tube of cross-sectional area 5.0×10−5m2 is inserted into a hole at ...
Thursday, April 10, 2014 at 10:56pm

physics
If you dive to a depth of 10m below the surface of a lake, Part A what is the pressure due to the water alone? What is the absolute pressure at that depth?
Thursday, April 10, 2014 at 10:54pm

physics
A 2.7-m nylon fishing line used to hold up a 7.1-kg fish has a diameter of 1.8mm . Part A How much is the line elongated?
Thursday, April 10, 2014 at 10:52pm

physics
A staging that weighs 210 N supports two painters, one 310 N and the other 440 N. The reading in the left scale is Fℓ = 320 N. What is the reading Fr in the right hand scale? Answer in units of N
Thursday, April 10, 2014 at 9:52pm

physics
A 50kg girl sits at the top of a slide 6m long tilted at an angle of 30 degrees. if it takes her 3.3s to slide to the bottom and the coefficient of kinetic friction is 0.45, how fast will she be going at the bottom?
Thursday, April 10, 2014 at 9:49pm

physics
Horizontal rays of red light (λ = 660 nm, in vacuum) and violet light (λ = 410 nm, in vacuum) are incident on the flint-glass prism shown in the drawing. The indices of refraction for the red and violet light are nred = 1.662 and nviolet = 1.698. The prism is ...
Thursday, April 10, 2014 at 9:45pm

physics
Bird bones have air pockets in them to reduce their weight–this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 43.0 g and its apparent ...
Thursday, April 10, 2014 at 9:39pm

physics
A 0.527 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger, and comes to rest some distance above the plunger. The plastic tube has an inner radius of 7.07 mm, and is frictionless. Neither the plunger nor...
Thursday, April 10, 2014 at 9:34pm

Physics
convert 220 degree into radians show work.
Thursday, April 10, 2014 at 8:01pm

Physics
A space probe is traveling in outer space with a momentum that has a magnitude of 7.84 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.29 x 106 N and a direction opposite to the probe's motion. ...
Thursday, April 10, 2014 at 6:28pm

Physics
When a compact disk with a 12.0-cm diameter is rotating at 4.2 rad/s, what is (a) the linear speed and (b) the centripetal acceleration of a point on its outer rim?
Thursday, April 10, 2014 at 5:01pm

physics
Light that is polarized along the vertical direction is incident on a sheet of polarizing material. Only 98% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. No light passes through the second sheet. What angle does the ...
Thursday, April 10, 2014 at 4:46pm

Physics
A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinder and its free end is attached to a block of mass 54.0 kg that rests on a platform. The cylinder has a mass of 265 kg and a radius of 0.430 m. Assume...
Thursday, April 10, 2014 at 4:38pm

physics
The intensity of the light that reaches the photocell in the figure below is 104.6 W/m2, when θ = 26°. What would be the intensity reaching the photocell if the analyzer were removed from the setup, everything else remaining the same?
Thursday, April 10, 2014 at 4:27pm

Physics
A solid cylinder is mounted above the ground with its axis of rotation oriented horizontally. A rope is wound around the cylinder and its free end is attached to a block of mass 54.0 kg that rests on a platform. The cylinder has a mass of 265 kg and a radius of 0.430 m. Assume...
Thursday, April 10, 2014 at 4:15pm

PHYSICS HELP
100turns of insulated wire are wraped around a wooden cylindrical core of cross-sectional area 12cm2. The two ends of the wire are connected to a resistor. The total circuit resistance is 13Ω. If an externally applied uniform magnetic field along the core changes from 1....
Thursday, April 10, 2014 at 3:39pm

physics
Your town is installing a fountain in the main square. If the water is to rise 16 m (52.5 feet) above the fountain, how much pressure must the water have as it moves slowly toward the nozzle that sprays it up into the air? Assume atmospheric pressure equal to 100,000 Pa.
Thursday, April 10, 2014 at 12:53pm

physics
If a compressive force of 3.2×104N is exerted on the end of a 16cm long bone of cross-sectional area 4.4cm2 , by how much does it shorten? Use Ebone=1.5×1010N/m2, tensile strength of bone = 1.3×108N/m2.
Thursday, April 10, 2014 at 12:49pm

College Physics
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...
Thursday, April 10, 2014 at 12:34pm

College Physics
An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no ...
Thursday, April 10, 2014 at 12:33pm

College Physics
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...
Thursday, April 10, 2014 at 12:32pm

physics help!
A uniform stationary ladder of length= 5.1 m and mass= 15 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. The coefficient of static friction between floor and ladder is μ = 0.41. The ladder makes an angle θ = 51° ...
Thursday, April 10, 2014 at 11:23am

College physics
dockworker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. thhe block starts from rest and moves 11.0m in 5.00s. (a) what is the mass of the ice block? (b) if the work stops pushing at the end of the 5.00s, How far does the block ...
Thursday, April 10, 2014 at 11:07am

physics
a rod is having a positive charge and a point charge is placed at a distance 'd' from it making angle 45 degree with one end and 37 degree with the other.calculate field. plz answer its urgent.
Thursday, April 10, 2014 at 9:37am

physics
A 0.527 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger, and comes to rest some distance above the plunger. The plastic tube has an inner radius of 7.07 mm, and is frictionless. Neither the plunger nor...
Thursday, April 10, 2014 at 4:08am

physics
A hydraulic lift has a leak so that it is only 6.0 × 101% efficient in raising its load. If the large piston exerts a force of 1.00 × 102 N when the small piston is depressed with a force of 15 N and the radius of the small piston is 18 cm, what is the radius of ...
Thursday, April 10, 2014 at 3:31am

physics
Which one of the following situations are likely to involve turbulent flow? a 1 micrometer microbe swimming in water at 30 micrometers per second a 1 millimeter bug crawling on the windshield of a car that is travelling at 30 m/s a 10 micrometer blood cell moving through a ...
Thursday, April 10, 2014 at 2:31am

physics
An aeroplane flying at 350km/h in a direction of N 40 degrees E strike a wind blowing from N 50 degrees W at 75km/h calculate the resulting velocity of the aircraft? need help trying to work this out. please. any help would be great.
Wednesday, April 9, 2014 at 10:30pm

PHYSICS
100turns of insulated wire are wraped around a wooden cylindrical core of cross-sectional area 12cm2. The two ends of the wire are connected to a resistor. The total circuit resistance is 13Ω. If an externally applied uniform magnetic field along the core changes from 1....
Wednesday, April 9, 2014 at 7:50pm

Physics
A 100 g mass is attached and wrapped around an apparatus at a constant radius of 10 cm. The hanging mass is dropped and obtains a speed of 0.2 m/s after 1 m. Using energy considerations, what is the moment of inertia of the apparatus?
Wednesday, April 9, 2014 at 7:43pm

physics
When kicking a soccer ball (0.35kg), the time of contact is usually about 5ms. What average kicking force would be required to attain a ball velocity of 110 km/hr if the ball is initially at rest?
Wednesday, April 9, 2014 at 7:32pm

physics
Two hockey players collide at center ice. Player 1 m = 70 kg Vi= 10 m/s7. Player 2 m = 90 kg Vi= - 3 m/s + 4 m/s If the two players become tangled up and travel together, what is their final velocity?
Wednesday, April 9, 2014 at 7:32pm

physics
Given the same exerted force (130N) exerted over 2s on two javelins of different mass (javelin1 = 1.2 kg; javelin2 = 1.6 kg), what is the kinetic energy of each javelin?
Wednesday, April 9, 2014 at 7:30pm

physics
Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
Wednesday, April 9, 2014 at 7:25pm

physics
An angry student (upset over his mid-term mark) throws an orange at his TA. The orange (m = 160 g) hits the TA in the head and comes to rest in 0.06s. If the skull can undertake a force of 1100N before the brain is damaged, how fast must the orange be traveling?
Wednesday, April 9, 2014 at 5:39pm

physics
James (80kg) is performing a bungee jump from a 210m high dam. He has a free fall for 160 meters until the rope starts to extend and stops 1 meter above ground. What is the stiffness of the bungee rope? How much work does the bungee rope perform?
Wednesday, April 9, 2014 at 5:38pm

physics
A soccer goalie (m = 65 kg) collides with the goalpost. If she was moving at 8 m/s and comes to rest in 1⁄2 a second, determine: a) The impulse the post exerts on the player. b) The impulse the goalie exerts on the post. c) The average force exerted by the post. d) The ...
Wednesday, April 9, 2014 at 5:36pm

Physics
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis
Wednesday, April 9, 2014 at 4:04pm

Physics
The circus has come to town, and Lael the Magnificent will kick a grape into her assistant's waiting mouth (not to worry − the grape is freshly washed). She starts at the origin and boots the grape at an angle 20.0° east of north. The grape starts from a height ...
Wednesday, April 9, 2014 at 2:32pm

physics
Mary is standing at a place such that she makes an angle of 42° to the right of the normal of a mirror. Where should Mary's mom stand so that she can best see Mary's reflection in the mirror?
Wednesday, April 9, 2014 at 2:32pm

Physics
Suppose you make an electromagnet with a copper wire and a battery by putting the two ends of the wire on the two ends of the battery. If you switch the side of the battery, are you changing the magnetic poles of the wire?
Wednesday, April 9, 2014 at 1:32pm

physics
A uniform thin rod of length 0.55 m and mass 5.5 kg can rotate in a horizontal plane about a vertical axis through its center. The rod is a rest when a 3.0-g bullet traveling in the horizontal plane of the rod is fired into one end of the rod. As viewed from above, the ...
Wednesday, April 9, 2014 at 12:33pm

physics
a person was climbing on a building.he slips 1 metre for every 5 metre he climb up. if the building is 53 metre high and he takes 5 seconds to climb 1 metre,find the total time taken by him to get on the top of the building.
Wednesday, April 9, 2014 at 12:17pm

Physics
a gas at temperature 27 C and at a pressure of 20 atm is allowed to expand and its new volume becomes 10 times that the original and the new pressure is equal to the atmospheric pressure.what is the new temperature of the gas?
Wednesday, April 9, 2014 at 12:09pm

physics
A rescue worker pulls an injured skier lying on a toboggan (with a combined mass of 127 kg) across flat snow at a constant speed. A 2.53 m rope is attached to the toboggan at ground level, and the rescuer holds the rope taut at shoulder level. If the rescuer's shoulders ...
Wednesday, April 9, 2014 at 9:54am

physics
how many Btu of heat are required to melt 8.35 lb of ice at 32 degrees F
Wednesday, April 9, 2014 at 9:30am

physics
A motorcycle accelerates uniformly from rest and reaches a linear speed of 33.4 m/s in a time of 11.6 s. The radius of each tire is 0.265 m. What is the magnitude of the angular acceleration of each tire?
Wednesday, April 9, 2014 at 12:56am

physics
A baseball pitcher throws a baseball horizontally at a linear speed of 41.3 m/s. Before being caught, the baseball travels a horizontal distance of 15.4 m and rotates through an angle of 52.7 rad. The baseball has a radius of 3.74 cm and is rotating about an axis as it travels...
Wednesday, April 9, 2014 at 12:28am

physics
A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.50 x 104 rad/s to an angular speed of 3.76 x 104 rad/s. In the process, the bit turns through 3.13 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to ...
Wednesday, April 9, 2014 at 12:02am

Physics
A cart loaded with bricks has a total mass of 22.3 kg and is pulled at constant speed by a rope. The rope is inclined at 27.3◦degrees above the horizontal and the cart moves 9.3 m on a horizontal surface. The coefficient of kinetic friction between ground and cart is 0....
Tuesday, April 8, 2014 at 9:53pm

Physics
A 3 kg block collides with a massless spring of spring constant 90 N/m attached to a wall. The speed of the block was observed to be 1.5 m/s at the moment of collision. The acceleration of gravity is 9.8 m/s^2. How far does the spring compress if the surface on which the mass ...
Tuesday, April 8, 2014 at 9:51pm

Physics
A 3.9 g mass is released from rest at C which has a height of 0.9 m above the base of a loop-the-loop and a radius of 0.4 m. The acceleration of gravity is 9.8 m/s^2. Find the normal force pressing on the track at A, where A is at the same level as the center of the loop. ...
Tuesday, April 8, 2014 at 9:50pm

Physics
A block of mass 2.48 kg is kept at rest as it compresses a horizontal massless spring (k= 113 N/m) by 4.65 cm. As the block is released, it travels 0.462 m on a rough horizontal surface before stopping. The acceleration of gravity is 9.8 m/s^2. Calculate the coefficient of ...
Tuesday, April 8, 2014 at 9:46pm

physics
A force of 120.0 N is applied to 2.00 cm diameter piston in a closed container of water with a density of 1,000 kg/m2. What is the force on another piston with diameter of 25.0 cm connected to the container?
Tuesday, April 8, 2014 at 9:45pm

physics
A thin, uniform rod is hinged at its midpoint. To begin with, one-half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 7.1 rad/s about an axis that is perpendicular to the left end of the rod and parallel...
Tuesday, April 8, 2014 at 9:40pm

Physics (Help Please)
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that experienced by...
Tuesday, April 8, 2014 at 8:53pm

Physics (Help Please)
An astronaut of mass 84.0 kg is taking a space walk to work on the International Space Station. Because of a malfunction with the booster rockets on his spacesuit, he finds himself drifting away from the station with a constant speed of 0.570 m/s. With the booster rockets no ...
Tuesday, April 8, 2014 at 8:52pm

Physics (Help please)
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...
Tuesday, April 8, 2014 at 8:49pm

PHYSICS HELP
A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis
Tuesday, April 8, 2014 at 3:47pm

physics
A 4.0-m-long steel wire has a cross-sectional area of 0.050cm2. Its proportional limit has a value of 0.0016 times its Young's modulus. Its breaking stress has a value of 0.0065 times its Young's modulus. The wire is fastened at its upper end and hangs vertically. A. ...
Tuesday, April 8, 2014 at 3:15pm

Physics
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...
Tuesday, April 8, 2014 at 1:58pm

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