Tuesday
April 21, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics (URGENT!!!)
A sniper fires a bullet at 120 m/s at 30° above the horizontal from the roof top of a 35 m high parking garage. If the bullet strikes the level ground beside the parking garage: a) How long was the bullet in the air? b) How far from the base of the parking garage did the ...
Friday, May 2, 2014 at 12:53pm

physics
one can determine a persons center of mass by having them recline on a plank resting on two scales. A person 2m tall lies on such a plank and the scale near her head reads 405 N and the one near her feet reads 360 N. Find the center of her mass.
Friday, May 2, 2014 at 12:46pm

Physics
A pirate captain has asked you to help him engineer a new plank to have prisoners walk overboard from. He needs the plan to fall overboard with the prisoners in order not to leave any evidence behind. He has a uniform beam of length 8m and a mass of 100kg is resting on two ...
Friday, May 2, 2014 at 12:44pm

physics
You lay a board over two wooden pegs. The board has a length of 5m and weighs 25 N. it overhangs the left peg by 1m and the right by 2m. Determine the normal force that each peg exerts on the board.
Friday, May 2, 2014 at 12:40pm

physics
You are a sucker for scenic overlooks, so you want to build a house overhanging a cliff. The way you do this is by taking a 20,000 N concrete beam and hang it over the edge of the cliff with one edge at the cliff ledge and the other edge 700m away in free space. You plan to ...
Friday, May 2, 2014 at 12:38pm

physics
A ladder of mass 20kg and length 5m can be held up against a wall because the wall exerts a normal force against it. The grass has a coefficient of a static friction of 0.35. find the normal force of the wall against the ladder.
Friday, May 2, 2014 at 12:24pm

physics
A turntable with a radius of 12cm is being explored by two bugs, one at 5cm from the center and another, very dizzy beetle at 2cm from the center. The turntable is spinning at 7 rad/s. Which bug will have the greater angular momentum?
Friday, May 2, 2014 at 12:22pm

physics
You always carry 3 wristwatches. One of them is synchronized with your labs atomic clock. Another is running low on battery and is 3 minutes behind, while the third watch is running 6 minutes fast. All were set to the same time when purchased. List the comparative angular ...
Friday, May 2, 2014 at 12:11pm

Physics
A figure skater spinning in a circle and dazzling the Olympic judges brings her arms together for a final flourish. 1. Does her angular momentum increase, decrease, or stay the same after she pulls her arm in? 2. Does her angular velocity increase, decrease, or stay the same ...
Friday, May 2, 2014 at 12:09pm

Physics
A rolling barrel with initial velocity 20 m/s encounters a hill 10m tall to slow it down 1. state where its angular speed is 0 2. state where its rotational kinetic energy will be 0 3. state where its translation kinetic energy will be 0 4. for each of the two flat surfaces ...
Friday, May 2, 2014 at 12:06pm

Physics
You have a crane boom with a mass of 10000kg being held up by a cable and holding a weight of 2500kg. A. Find the torque caused by the weight B. Find the torque caused by the cable C. Find the torque caused by any other force holding it in equilibrium
Friday, May 2, 2014 at 12:01pm

Physics
You wonder what would happen if you fired a 9.109e-31kg particle moving at 20 m/s in the x direction of a 1.672e-24kg particle moving at 12 m/s at 110 degrees from the x direction. The lighter particle hits the screen at a 100 degree angle from the x direction. What is the ...
Friday, May 2, 2014 at 11:59am

Physics
You shoot your enemy's reflection in the mirror while playing paintball. The y axis is perpendicular to the mirror. The mirror has a mass of 1kg and the paintball has a mass of 0.05 kg. The paintball hits the mirror at a speed of 8 m/s at an angle of 25 degrees from the ...
Friday, May 2, 2014 at 11:56am

Physics
Instead of standing in the back of the lane and rolling the ball toward the pins like most people, you place a 5kg bowling ball at rest at the back of the lane and try to hit it toward the pins with a perfectly elastic collision using a 1kg ball rolling at 5 m/s from a 25 ...
Friday, May 2, 2014 at 11:51am

Physics
A 25,000kg bowling ball moving at 40 m/s on a path angled at 17 degrees hits a 10000kg bowling ball moving at 25 m/s on a path angled at 60 degrees causing the lighter ball to be deflected of to an 65 degree angle. Assuming this is a two dimensional, perfectly elastic ...
Friday, May 2, 2014 at 11:47am

physics
A bookshelf is at rest in a room. A force of 35.0 newtons is applied to a bookshelf. If the floor imparts a frictional force of 2.90 newtons, what is the net force acting on the bookshelf? 37.9 newtons 32.1 newtons 33.1 newtons 35.0 newtons 50.5 newtons
Friday, May 2, 2014 at 10:38am

Physics/Calculus
It takes a force of 21,714lb to compress a coil spring assembly on a New York City Transit Authority subway car from its height of 8in to its fully compressed height of 5in. A. What is the assemblys force constant? B. How much work does it take to compress the assembly the ...
Friday, May 2, 2014 at 9:43am

Physics
A mountain climber is about to haul up a 50m length of hanging rope. How much work will it take if the rope weighs .624 N/m?
Friday, May 2, 2014 at 9:40am

Physics
A force of 2N will stretch a rubber band 2 cm. Assuming that Hooke's law applies, how far will a 4N force stretch the rubber band? How much work does it take to stretch the rubber band this far?
Friday, May 2, 2014 at 9:40am

Calculus/Physics
A spring has a natural length of 10in. An 800lb force stretches the spring to 14in. A. Find the force constant B. How much work is done in stretching the spring from 10 to 12 inches? C. How far beyond its natural length will a 1600lb force stretch the spring.
Friday, May 2, 2014 at 9:39am

Calculus/Physics
It took 1800J of work to stretch a spring from its natural length of 2m to a length of 5m. Find the spring's force constant.
Friday, May 2, 2014 at 9:38am

Physics
A sniper fires a bullet at 120 m/s at 30° above the horizontal from the roof top of a 35 m high parking garage. If the bullet strikes the level ground beside the parking garage: a) How long was the bullet in the air? b) How far from the base of the parking garage did the ...
Friday, May 2, 2014 at 2:37am

physics
If the end of the ruler of length 1 m is raised by 25 cm, the wooden bar is sliding down at the constant speed. What is the acceleration of the bar if the height of the end is increased twice
Thursday, May 1, 2014 at 11:19pm

physics
A moving object has a kinetic energy of 147 J and a momentum of 22.3 kg·m/s. a) Find the speed of the object. Answer in units of m/s
Thursday, May 1, 2014 at 10:11pm

Physics
An ornamental thermometer, commonly known as a Galileo thermometer, contains a number of spheres of hollow colored glass, representing different temperatures, immersed in a column of ethanol. A particular sphere rises from the bottom to the top of the column of liquid when the...
Thursday, May 1, 2014 at 6:50pm

Physics waves
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? a) 0.05 mm b) 5.0 mm c) 15.mm d) 20.mm e) 180 mm my answer: I got 10 mm but it is not listed as an option 2. When a tuning fork of unknown frequency is sounded ...
Thursday, May 1, 2014 at 4:24pm

Physics/Algebra
Physics: For a 225-watt bulb, the intensity I of light in lumens at a distance of x feet is I=225/x^2. a. What is the intensity of light 5 ft from the bulb? b. Suppose your distance from the bulb doubles. How does the intensity of the light change? Explain.
Thursday, May 1, 2014 at 4:14pm

Physics
Find the equivalent resistance in 16 ohm and 8.0 ohm connected in parallel.
Thursday, May 1, 2014 at 3:37pm

Physics quick help please
6. If 4.0 × 1018 J of work done on a point charge changes its electric potential difference by 25.0 V, then what is the magnitude of the charge? (Points : 1) 1.6 × 101^9 C 4.0 × 101^9 C 1.6 × 101^8 C 4.0 × 101^8 C 7. Two parallel plates have an ...
Thursday, May 1, 2014 at 12:32pm

PHYSICS URGENT
2. A point charge of +1.0 µC is moved in the direction of an electric field, and it has a change in electric potential difference energy of 10.0 J. What was the change in electric potential difference? 1 µC = 10-6 C (Points : 1) -1.0 × 10^8 V -1.0 × 10^...
Thursday, May 1, 2014 at 12:25pm

Physics
A piston in a bicycle pump is pressured half way into the pump without letting air get out and at unchanged temperature. Inside diameter of the pump is 2,3 cm. a) What is the pressure inside the pump in atm? b) How much force is needed to hold the piston in this position? The ...
Thursday, May 1, 2014 at 11:48am

Physics
A block of mass M1positioned on a slope (at an angle  ) is connected by means of an inextensible wire, of negligible mass, to another mass, m2, suspended from a frictionless pulley. The coefficients of static and dynamic friction between the slope and M1are 0.3 and 0.2...
Thursday, May 1, 2014 at 11:08am

physics
A wire of uniform thickness with a resistance of 27 ohm is cut into three equal pieces and are joint in parallel.find the resistance of the parallel combination.
Thursday, May 1, 2014 at 6:34am

Physics
Find the equivalent resistance in 16 ohms and 8.0 ohms connected in parallel.
Wednesday, April 30, 2014 at 10:46pm

Physics- HELP PLEASE:)
4.) Three 20-Ù resistors are connected in series to a 9-V battery. What is the voltage difference across each resistor? 5.) Three resistors of 5 Ù, 10 Ù, and 2 Ù are connected in parallel with one another. What is the equivalent resistance of this ...
Wednesday, April 30, 2014 at 10:28pm

Physics
An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 8.26 m/s2. Determine the orbital period of the satellite. ____min Ive tried everything I can think of the value im getting through the equations though isn'...
Wednesday, April 30, 2014 at 8:16pm

Physics waves
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? a) 0.05 mm b) 5.0 mm c) 15.mm d) 20.mm e) 180 mm my answer: I got 10 mm but it is not listed as an option 2. When a tuning fork of unknown frequency is sounded ...
Wednesday, April 30, 2014 at 8:01pm

Physics
You have a crane boom with a mass of 10000kg being held up by a cable and holding a weight of 2500kg. 1. Find the torque caused by the weight 2. Find the torque caused by the cable 3. Find the torque caused by any other force holding it in equilibrium
Wednesday, April 30, 2014 at 6:52pm

physics
A stone is thrown in vertical upward direction with velocity of 5 m/s. if the acceleration of the stone during it motion is 10 m/s2 in h downward direction, what will be the height attained by the stone and how much time will it take to reach there?
Wednesday, April 30, 2014 at 12:56pm

physics
what property does (-5)+5=0 illustrate
Wednesday, April 30, 2014 at 12:45pm

Physics
A cylinder with a movable piston has the square meter 24cm2. How far will the piston go down if 5.0 kg weight is laid on the piston and the temperature remains the same? P: 1.0 atm. Help please :)
Wednesday, April 30, 2014 at 12:18pm

physics
A solid uniform sphere is released from the top of an inclined plane .25 m tall. the sphere rolls down the plane without slipping and there is no energy lost from friction. What is the translational speed of the sphere at the bottom of the incline?
Wednesday, April 30, 2014 at 12:02pm

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.
Wednesday, April 30, 2014 at 8:36am

physics
A climber stands on a ledge on one side of a valley. He claps his hands and hears an echo from the opposite side of the valley 1.6 s later. How wide is the valley?
Wednesday, April 30, 2014 at 5:47am

physics 1
The drawing shows an intravenous feeding. With the distance shown, nutrient solution (ρ = 1050 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.
Wednesday, April 30, 2014 at 12:51am

physics
Airplane flies at velocity of 400 mph and the wind is blowing north at 200 mph
Wednesday, April 30, 2014 at 12:00am

Physics
If it takes a particle in SHM 0.60ss to travel from the equilibrium position to the maximum displacement (amplitude), what is the period of oscillation?
Tuesday, April 29, 2014 at 8:33pm

Physics
The maximum kinetic energy of a mass-spring system in SHM is equal to
Tuesday, April 29, 2014 at 8:32pm

Physics
At the Earth's surface, a projectile is launched straight up at a speed of 9.9 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth. _____m
Tuesday, April 29, 2014 at 8:08pm

Physics
An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 8.26 m/s2. Determine the orbital period of the satellite.
Tuesday, April 29, 2014 at 8:08pm

Physics
A 1.0 m long string is fixed at both ends and has a tension of 80N. The mass of the string is 2 gm. Find the third harmonic of the sound emitted by this string. a. 50 Hz b. 100 Hz c. 200Hz d. 300 Hz
Tuesday, April 29, 2014 at 6:08pm

Physics
In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given point every minute. Late at night, the traffic flow is only 5 cars per minute. What is the late-night decibel level?
Tuesday, April 29, 2014 at 3:42pm

Physics
A golf ball struck with an initial speed of 41.8m/s. What is the range of the shot if the launch angle is 30.0º?
Tuesday, April 29, 2014 at 1:53pm

Physics
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball. The acceleration due to gravity on the moon is 1/6 of its value on the earth (gravity on moon -1.633m/s2). On earth, golf balls are driven at about 70 m/s with a loft angle of about 15º and have...
Tuesday, April 29, 2014 at 1:34pm

physics
A 1500-kg car coast in neutral down a 2.0degrees hill. The car attains a terminal speed of 20.0 m/s. The question is:how much power must the engine deliver to drive the car on a level road at 20.0 m/s?? Help me out please!!
Tuesday, April 29, 2014 at 10:37am

Physics help
Let's say you have a plot for Pendulum experiment. Let's assume g for this experiment was measured (from the slope of the plot) to be 9.78 [ms-2. The vertical intercept, however, is 0.011 [s2]. What might this translate to for a measurement of the length offset ...
Tuesday, April 29, 2014 at 12:14am

physics
A steel (\alpha = 12 x 10^{-6} ^o C^{-1}) container with a volume of 548 {cm}^3 is filled with oil (\beta = 0.7 x 10^{-3} ^oC^{-1}). If the temperature is increased by 10^oC how much oil overflows? V_{spillage} =
Monday, April 28, 2014 at 10:23pm

physics
What is the total internal kinetic energy of 16.2 moles of a monatomic ideal gas at a temperature of 279 K? KE =
Monday, April 28, 2014 at 10:16pm

physics
A large cube (one side measuring 1.0 m) is submerged in water, with the top face of the cube 8.7 m below the surface. Find a) the force exerted by the water on each face of the cube. b) the buoyant force on the cube.
Monday, April 28, 2014 at 9:53pm

Physics
According to F=-x if F is in Newtons, what are the units of k?
Monday, April 28, 2014 at 9:19pm

physics
In the previous problem (Question 4), if the distance between the two plates of the capacitor is 3 cm, what is the magnitude of the uniform electric field between the two plates?
Monday, April 28, 2014 at 8:15pm

physics
The electric potential increases from 10 V to 70 V from the bottom plate to the top plate of a parallel-plate capacitor. We are going to move a charge of +5 x 10-4 C from the bottom plate to the top plate. What is the magnitude of the change in potential energy of this charge...
Monday, April 28, 2014 at 8:14pm

physics
The potential energy of a +2 x 10-6 C charge decreases from 0.15 J to 0.05 J when it is moved from point A to point B. What is the change in electric potential between these two points? Do not enter any (-) sign in your answer.
Monday, April 28, 2014 at 8:14pm

physics
A total charge of +4 C flows from the +9 V positive terminal of a battery to the negative terminal at 0 V. What is the change in potential energy of the charge?
Monday, April 28, 2014 at 8:13pm

physics
A charge of +0.5 C is moved from a position where the electric potential is 10 V to a position where the electric potential is 70 V. What is the the change in potential energy of the charge associated with this change in position?
Monday, April 28, 2014 at 8:12pm

physics
With a magnetic field perpendicular to a single 13.2 cm diameter circular loop of copper wire decreases uniformly from .670 T to zero. If the wire is 2.25 mm in diameter how much charge moves past a point in the coil during this operation?
Monday, April 28, 2014 at 6:04pm

physics
Your vertical spring accelerometer has a 40 g mass hanging from it. You climb aboard the roller coaster that starts at rest and watch the accelerometer read 0.45 for 5 seconds while descending the first peak and then change to 2.8 for 2.5 seconds while going through the bottom...
Monday, April 28, 2014 at 5:32pm

physics
A 60 kg stunt person runs off a cliff at 5.3 m/s and lands safely in the river 11.8 m below. What was the splashdown speed?
Monday, April 28, 2014 at 5:20pm

physics
A child and sled with a combined mass of 48.4 kg slide down a frictionless hill that is 7.15 m high. If the sled starts from rest, what is its speed at the bottom of the hill?
Monday, April 28, 2014 at 4:55pm

Physics: Earthquakes
I'm studying for an upcoming exam and I came across this problem: 10 seconds separate the P- and S-wave arrival times of an earthquake which shakes you 1m. How far away is the earthquake epicenter and what is the magnitude? I'm stuck and would really appreciate the ...
Monday, April 28, 2014 at 3:59pm

Physics
Estimate the total amount of translational kinetic energy in a small classroom at normal room temperature. Assume the room measures 5.00mm by 12.0mm by 4.00mm .
Monday, April 28, 2014 at 3:34pm

Physics
What is the total internal energy of 5.00molmol of 30∘C^\circ C He\rm{He} gas and O2\rm{O_2} gas, respectively?
Monday, April 28, 2014 at 3:33pm

Physics waves- check answers please
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? my answer: I got 10 mm but I'm not sure if it is the correct answer. 2. For two connect pendulums to resonate, they must have the same: a) mass b) amplitude c) ...
Monday, April 28, 2014 at 2:50pm

Physics
A sniper fires a bullet at 120 m/s at 30° above the horizontal from the roof top of a 35 m high parking garage. If the bullet strikes the level ground beside the parking garage:
Monday, April 28, 2014 at 2:17pm

Physics
A satellite is placed 39875 m above the Moon's SURFACE. (M=7.35e22 kg, R=1.74e6 m) Find the Period of the satellite in seconds. (assume a circular orbit)
Monday, April 28, 2014 at 11:06am

Physics
A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
Monday, April 28, 2014 at 11:05am

Physics MCQ - Quick check
A washing machine spin dryer has a period T. In order to triple the centripetal acceleration of the clothes in the dryer the period should be ? 3T A cube of mass 2.0 kg is kept pressed against a vertical wall by applying a horizontal force of 60N. If the coefficient of ...
Monday, April 28, 2014 at 9:41am

Engineering Physics
which of the following is equal to the angular acceleration of a disk? a)first time derivative of angular position b) second time derivative of angular position
Monday, April 28, 2014 at 5:47am

Physics waves- check answers please
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? my answer: I got 10 mm but I'm not sure if it is the correct answer. 2. For two connect pendulums to resonate, they must have the same: a) mass b) amplitude c) ...
Sunday, April 27, 2014 at 9:20pm

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.00 g of condensation forms on a glass containing both water and 200 g of ice, how many grams of the ice will melt as a result? Assume no other heat transfer occurs.
Sunday, April 27, 2014 at 9:11pm

physics
if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost
Sunday, April 27, 2014 at 6:22pm

physics
how many gram of ice at 0 c can be melted by the heat released when one gram of steam condense to water at 100 c check my answer please and you deman i am sorry by accident i post it the previous question solution Qcold=-Qhot MLf(ice)=-MlV(water) Mice = -(-0.001*2256000)/(...
Sunday, April 27, 2014 at 5:48pm

Physics
A ammeter is to be constructed using a galvanometer that has a 2.00 mA full-scale deflection and internal resistance of 50.0 ohms. It must be good enough to detect 40 mA, which is the max current. How would one do this? How would you make a voltmeter able to read the largest ...
Sunday, April 27, 2014 at 5:22pm

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.
Sunday, April 27, 2014 at 4:56pm

physics
A 1.50 ✕ 103 kg car starts from rest and accelerates uniformly to 17.1 m/s in 12.7 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. W (b) Find the instantaneous power output of the engine at t...
Sunday, April 27, 2014 at 4:49pm

physics
A highway is made of concrete slabs that are 14.0 m long at 20° C. (a) If the temperature range at the location of the highway is from -17.8° C to +40.8° C, what size expansion gap should be left (at 20° C) to prevent buckling of the highway? (b) How large are ...
Sunday, April 27, 2014 at 3:11pm

Physics
Calculate the number of H2O molecules in a human body of mass 65.9 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)
Sunday, April 27, 2014 at 3:08pm

Physics waves- check answers please
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? my answer: I got 10 mm but I'm not sure if it is the correct answer. 2. For two connect pendulums to resonate, they must have the same: a) mass b) amplitude c) ...
Sunday, April 27, 2014 at 2:41pm

Physics
If a car engine has a power,P. Write an expression for the time it will take to accelerate from w to 4w. Note that P=wt where t is torque.
Sunday, April 27, 2014 at 2:36pm

physics
Indigenous people sometimes cook in watertight baskets by placing hot rocks into water to bring it to a boil. What mass of 500ºC rock must be placed in 4.00 kg of 15.0ºC water to bring its temperature to 100ºC , if 0.0250 kg of water escapes as vapor from the ...
Sunday, April 27, 2014 at 12:19pm

physics
If you pour 0.0100 kg of 20.0ºC water onto a 1.20-kg block of ice (which is initially at −15.0ºC ), what is the final temperature? You may assume that the water cools so rapidly that effects of the surroundings are negligible.
Sunday, April 27, 2014 at 12:09pm

physics
A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0ºC is placed in a freezer. What is the final temperature if 377 kJ of energy is transferred from the bowl and soup, assuming the soup’s thermal properties are the same as that of water?
Sunday, April 27, 2014 at 11:20am

physics
How many grams of coffee must evaporate from 350 g of coffee in a 100-g glass cup to cool the coffee from 95.0ºC to 45.0ºC ? You may assume the coffee has the same thermal properties as water and that the average heat of vaporization is 2340 kJ/kg (560 cal/g). (You ...
Sunday, April 27, 2014 at 11:02am

physics
A coin is dropped from the Leaning Tower of Pisa. It starts from rest and falls freely. Neglecting air resistance, compute the coin's position and velocity at 1.0 s, 2.0 s and 3.0 s.
Sunday, April 27, 2014 at 3:11am

Physics
A 1900 kg Oldsmobile traveling south on Abbott Road at 13.6 m/s is unable to stop on the ice covered intersection for a red light at Saginaw Street. The car collides with a 3854 kg truck hauling animal feed east on Saginaw at 9.8 m/s. The two vehicles remain locked together ...
Saturday, April 26, 2014 at 11:04pm

Physics
A disk at rest experiences a constant angular acceleration for t = 85 s, at the end of which it is spinning with a frequency of f = 45 rpm. Please answer the following questions. A)Write an expression for the magnitude of the angular velocity of the disk after the acceleration...
Saturday, April 26, 2014 at 5:30pm

physics
A diagram shows two cylinders containing two pistonsA and B. The two cylinders are connected with a tube containing a fluid. The system is similar to the hydraulic braking system of a car. A man pushes down on piston A while piston B has a 10kg mass sitting on it. The surface ...
Saturday, April 26, 2014 at 3:27pm

physics
The drawing shows a top view of a square box lying on a frictionless floor. Three forces, which are drawn to scale, act on the box. Consider an angular acceleration with respect to an axis through the center of the box (perpendicular to the screen). Which one of the following ...
Saturday, April 26, 2014 at 1:05pm

physics
Which one of the following statements describes the condition(s) for which a rigid body is in equilibrium? Only internal forces can be present. The sum of the externally applied forces must be zero, and the sum of the externally applied torques must be zero. Each external ...
Saturday, April 26, 2014 at 1:03pm

physics
explain to me the process doping. what is it? how is it done?
Saturday, April 26, 2014 at 9:07am

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