Wednesday

May 27, 2015

May 27, 2015

**physics**

A stationary pool ball with mass 0.20 kg is struck with an average force of 35 N over a time of 18 ms. What speed does it have just after impact?
*Wednesday, May 27, 2015 at 1:28pm*

**Physics**

In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the opposite direction of ...
*Wednesday, May 27, 2015 at 11:24am*

**Science (Physics)**

A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?
*Wednesday, May 27, 2015 at 11:07am*

**physics**

Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?
*Wednesday, May 27, 2015 at 6:57am*

**physics**

Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?
*Wednesday, May 27, 2015 at 5:39am*

**Physics**

In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the opposite direction of ...
*Tuesday, May 26, 2015 at 6:43pm*

**Physics**

In deep space, a small rock orbits an asteroid. The circular, orbit radius is 1037m and the velocity of the rock is 8.02m/s. Find the mass of the asteroid.
*Tuesday, May 26, 2015 at 5:09pm*

**Physics**

On a flat golf course, a golf ball lies 12m from the base of a lamp post. A golfer hits the ball with a club, giving the golf ball an initial velocity of 18 m/s. At 2.9 seconds, after being hit, the golf ball strikes the top of the lamp post. How high (m) is the lamp post?
*Tuesday, May 26, 2015 at 3:38pm*

**Physics**

A mass slides down a smooth incline, the normal force is exactly 1/3 the weight of the mass. Find the angle of the incline, relative to the horizontal.
*Tuesday, May 26, 2015 at 11:41am*

**physics**

If the electric field strength in air is more than 3x106 N/C then the air will be become agood conductor .Determine the amount of charge that can be carried by a metal sphere of radius 2.0 m
*Tuesday, May 26, 2015 at 11:32am*

**physics**

How many joules of energy are required to melt 80g of silver.
*Tuesday, May 26, 2015 at 9:51am*

**physics**

At what height above the ground must a body of mass 10kg be situated in order to have potential energy in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m-s
*Monday, May 25, 2015 at 11:19pm*

**Physics**

A car drives over a hump in the road. The radius of the (circular) hump is 45m. How fast (m/s) would the car need to travel, so that the wheels just barely lose contact with the road?
*Monday, May 25, 2015 at 10:42pm*

**Physics **

A person struggles to read by holding a book at arms length, a distance of 50.0 cm. What power of reading glasses should be prescribed for him, assuming they will be placed 2.0 cm from the eye and he wanted to read at normal near point of 25.0 cm?
*Monday, May 25, 2015 at 8:53pm*

**physics **

A body A of mass 2.0kg makes an elastic collision with another body B at rest. After collision,A continues to move in the original direction but with one-fourth of its original speed. Determine the value of mass B
*Monday, May 25, 2015 at 5:45pm*

**Physics/Dynamics**

A truck has wheels of diameter 0.9m, a weight of 8000kg, a wheel-base of 4m, and a tray height of approximately 1.2m. The truck’s weight distribution is 50% on the rear wheels and 50% on the front wheels. The truck’s front springs have a combined stiffness of 550,000...
*Monday, May 25, 2015 at 4:02am*

**Physics**

In deep space, a small rock orbits an asteroid. The circular, orbit radius (between their center of masses) is 1037 m and the velocity of the rock is 8.02 m/s. Find the mass (kg) of the asteroid. G=6.67x10^-11 m^3/kgs^2. I got 1.0x10^15 but that is incorrect.
*Sunday, May 24, 2015 at 9:53pm*

**Physics**

Vectors A and B are added to produce C, that is A+B=C. If B=-5x+5y and C=2x-3y. Find the unit vector of A, that is find A (in component form).
*Sunday, May 24, 2015 at 9:12pm*

**Physics**

A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the (a)stress on the wire (b)strain in the wire
*Sunday, May 24, 2015 at 7:17pm*

**Physics**

A spring is compressed by 3cm.calculate the energy stored in the spring,if its force constant is 300Nm
*Sunday, May 24, 2015 at 7:08pm*

**physics**

14,0 of KOH is neutralised in 1dm^3 of water by sulphuric acid with a concentration at 0,1 mol dm^-3 how do i calculate it
*Sunday, May 24, 2015 at 3:01pm*

**Physics**

A fullback preparing to carry the football starts from rest and accelerates straight ahead. He is handed the ball just before he reaches the line of scrimmage. Assume that the fullback accelerates uniformly (even during the handoff), reaching the line with a velocity of 7.96 m...
*Sunday, May 24, 2015 at 12:12am*

**Physics**

A car speeds, at a constant 16 m/s, past a parked police motorcycle. Five seconds later, the police officer leaves on her motorcycle, and accelerates at 2 m/s2. How many seconds until she catches the car?
*Saturday, May 23, 2015 at 11:13pm*

**Physics**

At a constant velocity, a 5kg bag of cement is pulled straight up a 7m wall. How much work is done by the puller? (Gravitational pull is 9.8m/s2, W(J)=F(N)*D(m) How do I work this problem??
*Saturday, May 23, 2015 at 2:54pm*

**physics**

What is the value of current when charge of 5 uc paases through a conductor in 2seconds
*Friday, May 22, 2015 at 11:34pm*

**advanced physics**

A toy roller coaster contains a loop of radiusR. A toy train, which consistsof a lot of small waggons is moving towards the loop with constant velocity. The lengthof the train isL >2Rπ, and the radius of the loop is much larger than the height of thewaggons. The ...
*Friday, May 22, 2015 at 11:32am*

**physics**

is differentials used in burger's equation?
*Friday, May 22, 2015 at 11:21am*

**physics**

is differentials used in burger's equation?
*Friday, May 22, 2015 at 11:18am*

**physics**

a shell is fired at an angle of 30 C above the horizontal at a velocity of 140 m/s
*Friday, May 22, 2015 at 9:24am*

**physics**

a body travelling along a straight line travels one half of the total distance with the velocity V0.The remaining part of the distance was covered with the velocity of V1 for half of the time and with velocity V2 for other half of time. Find average velocity of the body.
*Friday, May 22, 2015 at 1:45am*

**physics**

a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop
*Thursday, May 21, 2015 at 11:10pm*

**Physics**

A small aircraft A is about to land with an airspeed of 80 mi/hr. If the aircraft is encountering a steady side wind of speed 10 mi/hr, what angle (alpha) should the pilot direct the aircraft so the the absolute velocity is parallel to the runway? What is the speed at touchdown?
*Thursday, May 21, 2015 at 10:30pm*

**Physics**

An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens
*Thursday, May 21, 2015 at 10:04pm*

**Physics**

An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens I think its A but I'm not sure
*Thursday, May 21, 2015 at 9:13pm*

**physics**

A bullet is fired through a wooden board with a thickness of 10.0 cm. The bullet hits the board perpendicular to it, and with a speed of +390 m/s. The bullet then emerges on the other side of the board with a speed of +234 m/s. Assuming constant acceleration (rather, ...
*Thursday, May 21, 2015 at 8:41pm*

**Physics**

Three charged particles are arranged on corners of a square as shown in the figure below, with charge -Q on both the particle at the upper left corner and the particle on the lower right corner, and charge +2Q on the particle at the lower left corner. (i) What is the direction...
*Thursday, May 21, 2015 at 7:41pm*

**physics **

If an object is thrown in an upward direction from the top of a building 160 ft high at an initial speed of 30 mi/h, what is its final speed when it hits the ground
*Thursday, May 21, 2015 at 12:14pm*

**physics**

you walk west for 52 m, then you walk 33.2° north of west for 44 m, and finally you walk due north for 25 m. Find the components of your final displacement, from your initial to final point, along the north and west directions.
*Thursday, May 21, 2015 at 11:41am*

**physics**

a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
*Thursday, May 21, 2015 at 10:58am*

**physics**

A resistor is connected inseries
*Thursday, May 21, 2015 at 7:49am*

**physics**

solid gold statue with mass of 7.55kg, weight of 74.0N, and disperses 680 cubic meters of water when immersed. i need to find the density. but im unsure how to find the volume first to put it into the formula?
*Thursday, May 21, 2015 at 12:38am*

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
*Wednesday, May 20, 2015 at 10:27pm*

**physics**

A plane flies at 20.0m/s ascending at 30 degrees above the horizontal. The plane drops a care package at a height that allows the package to land 750m away (horizontally). 1.) At what location above the ground was the package released? 2.) Find the velocity (magnitude and ...
*Wednesday, May 20, 2015 at 9:47pm*

**Physics **

Two tuning forks are struck at the same time; one with a pitch of 410Hz one a frequency of 500Hz. How many pitches do you hear and what are the frequencies?
*Wednesday, May 20, 2015 at 6:55pm*

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
*Wednesday, May 20, 2015 at 6:38pm*

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C. I am stuck on trying to figure out how to solve this. Please help!
*Wednesday, May 20, 2015 at 6:37pm*

**physics **

A skier stands on a 5 degree slope.if the cofficient of static friction is 0.1,does the skier start to slide down?
*Wednesday, May 20, 2015 at 6:18pm*

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
*Wednesday, May 20, 2015 at 5:18pm*

**physics**

750km towards North West?
*Wednesday, May 20, 2015 at 1:52pm*

**PHYSICS**

A Goodyear blimp typically contains 5040 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 282 K. What is the mass (in kg) of the helium in the blimp?
*Wednesday, May 20, 2015 at 12:33pm*

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
*Wednesday, May 20, 2015 at 12:19pm*

**PHYSICS**

A thermos contains 152 cm3 of coffee at 93.8 °C. To cool the coffee, you drop two 11.6-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee as if it were ...
*Wednesday, May 20, 2015 at 11:30am*

**physics**

What is current?
*Wednesday, May 20, 2015 at 11:09am*

**Physics**

On an inclined plane, how does a larger angle of inclination result in a faster speed? I tried working this out by myself using different values for the angle of incline and the same weight - which was just 100N. I found that the frictional force was equal to the force acting ...
*Tuesday, May 19, 2015 at 4:54pm*

**physics**

1. The batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock current? A. 4.5 V B. 18.0 V C. 9.0 V D. 6.0 V **C is my answer Am I correct? Thanks!!
*Tuesday, May 19, 2015 at 12:34pm*

**Physics**

On an inclined plane, how does a larger angle of inclination result in a faster speed? I tried working this out by myself using different values for the angle of incline and the same weight - which was just 100N. I found that the frictional force was equal to the force acting ...
*Tuesday, May 19, 2015 at 7:24am*

**Physics**

A 5.0cm tall object is placed 16cm from a convex lens with a focal length of 8.4cm. What are the image height and orientation?
*Tuesday, May 19, 2015 at 6:50am*

**physics**

a convex mirror has a focal length of -10.0cm. what is the image position for an object that is placed l20.0cm from the mirror?
*Tuesday, May 19, 2015 at 6:48am*

**physics**

marco pushes a stalled car 20 meters with a constant force of 500N in 50 seconds. Calculate the average power marco required to move the car.
*Tuesday, May 19, 2015 at 6:45am*

**physics**

how much work is done lifting a 75 kg child 1.75m?
*Tuesday, May 19, 2015 at 6:42am*

**physics**

Two metallic spheres, each with a mass of 0.46 g are suspended as pendulums by light strings from a common point. They are given the same electric charge, and the two come to equilibrium when each string is at an angle of 5.2° with the vertical. If the string is 21.0 cm ...
*Monday, May 18, 2015 at 7:15pm*

**physics**

a softball is thrown at a speed of 40 miles per hour in a course that makes an angle of 60 degrees with the positive x axis. what is the initial speed in the horizontal direction?
*Monday, May 18, 2015 at 7:12pm*

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
*Monday, May 18, 2015 at 5:16pm*

**Physics**

I can't figure out how to do this. design an experiment you could construct that might measure the amount of work it takes to change the volume of a gas in a piston. What materials would you use? What would you measure? What results would you expect? What if the results ...
*Monday, May 18, 2015 at 5:11pm*

**Physics**

a ray of light is incident on an air-glass boundary at 30 degrees. The index of refraction of air is 1,and the index of refraction for the glass is 1.4. What is the angle of the reflected ray, and what is the angle of the refracted ray? Thanks in advance. Been stuck for three ...
*Monday, May 18, 2015 at 4:28pm*

**physics**

A vessel contains 50 cc of mercury at 40ºc and heated to 70º c .how much amount of mercury will overflow.
*Monday, May 18, 2015 at 1:01pm*

**physics**

A boat heads across an East-West river flowing at 3 m/s [W]. The boat starts at the South End and travels at 6 m/s [N25W]. What is the velocity (including direction) of the boat with respect to the ground?
*Monday, May 18, 2015 at 1:00pm*

**Physics**

A pilot maintains a heading due west with an air speed of 240 km/h. After flying for 30 min, he finds himself over a town that he knows is 150 km west and 40 km south of his starting point. a) What is the wind velocity, in magnitude and direction? b) What heading should he now...
*Monday, May 18, 2015 at 12:58pm*

**Physics**

Two ropes are attached to a wagon, one horizontal to the west with a tension force of 40 N and the other east at an angle of 23° northward and a tension force of 50 N. Find the components of the net force on the cart
*Monday, May 18, 2015 at 12:33pm*

**physics**

In a tug of war match, each side pulls with a force of 500N, but the rope does not move. How much work is done?
*Monday, May 18, 2015 at 8:10am*

**physics**

An 8kg block starts from rest from the top of a plane, inclined at 40o with respect to the horizontal, and slides down at a constant acceleration. If the coefficient of kinetic friction between the block the plane is 0.35 determine how far the block travels in 3s. 2013/
*Monday, May 18, 2015 at 7:32am*

**physics**

An 8kg block starts from rest from the top of a plane, inclined at 40o with respect to the horizontal, and slides down at a constant acceleration. If the coefficient of kinetic friction between the block the plane is 0.35 determine how far the block travels in 3s. 2013/
*Monday, May 18, 2015 at 7:32am*

**PHYSICS**

A BOAT WHICH HAS A SPEED IS 5 Km/Hr IN STILL WATER CROSSES A RIVER OF WIDTH 1 Km along the shortest possible path in 15 minutes. find velocity of the river water.
*Monday, May 18, 2015 at 2:28am*

**PHYSICS**

a river is flowing west to east at a speed of 5 m/ minutes .in what direction should a man on the south bank of the river capable of swimming of 10 m / minutes in still water should swim to cross the river 1. in short time 2.along short path
*Monday, May 18, 2015 at 2:14am*

**physics**

A body of mass 10 kg moving at a speed of 4 m/s collides with another body of mass 4 kg at rest. After collision, if the speed of the body of 4kg mass be 5 m/s, the speed of body of 10kg mass shall be?
*Sunday, May 17, 2015 at 9:22pm*

**physics**

A body with mass 0.30 kg hangs by a spring with force constant 50.0 N/m. By what factor is the frequency of oscillation reduced if the oscillation is damped and reaches 1/e of its original amplitude in 100 oscillations?
*Sunday, May 17, 2015 at 10:46am*

**physics**

An adventurous archaeologist crosses between two rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope. The rope will break if the tension in it exceeds 25000N, and our hero’s mass is 90kg. (a) If...
*Sunday, May 17, 2015 at 8:13am*

**physics**

A horizontal force of 50 N is required to pull an 8 kg block of aluminum at a uniform velocity across a horizontal wooden desk. What is the coefficient of kinetic friction?
*Sunday, May 17, 2015 at 8:00am*

**Physics**

6) Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?
*Sunday, May 17, 2015 at 5:51am*

**Physics**

A body is projected with a velocity of 200m/s at an angle of 30 degrees above the horizontal. calculate the time taken to reach the maximum height, its velocity after 16s
*Sunday, May 17, 2015 at 1:49am*

**Physics**

A car is going 18.3 m/s down a road. At time t=0s, a squirrel runs in front of the car 36 meters away. It takes the driver t=0.67s to slam on the brakes, but after that , the brakes offer a frictional force F(fr)=21000N. Her car masses at 1860 kg. a) How far does the car ...
*Sunday, May 17, 2015 at 1:06am*

**Physics**

Two identical 2 ohm resistors are connected in parallel to a 1 ohm resistor in the circuit.the potential difference across the cell is 6 v and internal resistance is negligible.calculate the effect across the parallel combination
*Saturday, May 16, 2015 at 7:51am*

**physics**

A net force of 1000 N is needed to accelerate a small 1200 kg car from 5 m/s to 8 m/s. Use the work-energy theorem to determine the net work done by the force.
*Saturday, May 16, 2015 at 6:25am*

**Physics**

A pendulum with a length of 1.25m has a period of 2.2s. What is the value of g?
*Friday, May 15, 2015 at 12:12pm*

**Physics**

A projectile is fired with a velocity u at the entrance A to a horizontal tunnel of length L and height H. Determine the minimum value of u and the corresponding value of the angle θ for which the projectile will reach B at the other end of the tunnel without touching the...
*Friday, May 15, 2015 at 6:55am*

**physics**

a car rounds a curve with a radius of 45.0 m at a speed of 22.0 m/s. What is the centripetal acceleration of the car? please show work
*Friday, May 15, 2015 at 6:41am*

**Physics**

A tennis player makes a return at a speed of 18m/s and at a height of 3m to land in the court at a horizontal distance of 12m from her. What are the possible angles of projection of the wall
*Thursday, May 14, 2015 at 9:34pm*

**Physics**

A satellite of the Earth has a mass of 1550 kg. It orbits Earth with a mean radius of orbit of 7.00 x 10^6 m. a) What is the gravitational potential energy of the satellite with respect to Earth?
*Thursday, May 14, 2015 at 12:22am*

**science(physics)**

The stream of a river is flowing with velocity 1 km/h.What should be the direction of a swimmer to cross the river straight if he can swim at the rate of 2 km/h in still water.
*Wednesday, May 13, 2015 at 11:36pm*

**PHYSICS**

An ice chest at a beach party contains 12 cans of soda at 2.69 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.05-kg watermelon at 24.1 °C to the chest. The specific heat capacity of watermelon is nearly ...
*Wednesday, May 13, 2015 at 9:10pm*

**physics**

a car for half of its time at 80km/h and for rest half of time at 40 km/h. total distance covered is 60 km/h. what is the average speed of car find
*Wednesday, May 13, 2015 at 8:59pm*

**physics**

In a police ballistics test, a 10.0-g bullet moving at 300 m/s is fired into a 1.00-kg block at rest. The bullet goes through the block almost instantaneously and emerges with 50.0% of its original speed. What is the speed of the block just after the bullet emerges
*Wednesday, May 13, 2015 at 5:37pm*

**physics**

A ball is projected upward at time t = 0.0 s, from a point on a roof 40 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 15.4m/s. Consider all quantities as positive in the upward direction. The time when the ball ...
*Wednesday, May 13, 2015 at 2:44pm*

**physics**

an eiastic cord can be stretched to its elastic limit by a load of 2N.if a 35cm length of the cord is extended 0.6cm by a force of 0.5N,what will be the length of the cord when the stretching force is 2.5cm.
*Wednesday, May 13, 2015 at 1:46pm*

**physics**

a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. ) Suppose now friction is present and k = 0....
*Wednesday, May 13, 2015 at 11:58am*

**Physics **

+Q charge situate at center of equilateral triangle of side 'a'. If +q charge situate at each corner of triangle. Then find the direction and magnitude of resultant force.
*Wednesday, May 13, 2015 at 8:12am*

**Physics**

Hi! I am going to apply for a medical study admission test and where just wondering if you guys could help me to come up with the formula for solving this problem. I am not looking for a answer, just the mathematical formula to solve theese kind of questions. The question is ...
*Wednesday, May 13, 2015 at 7:13am*

**Physics**

Hi! i am going to apply for a medical study admission test and where just wondering if you guys could help me to come up with the formula for solving this problem. I am not looking for a answer, just the mathematical formula to solve theese kind of questions. The question is ...
*Wednesday, May 13, 2015 at 7:03am*

**physics**

Two metallic wires X and Y are connected to a series. wire X has length l and radius r . While Y has length 2 l and radius 2 r. find the ratio of total resistance of series combination and resistance wire X , if both the wires are of same material.
*Wednesday, May 13, 2015 at 1:44am*

**Physics**

How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.
*Wednesday, May 13, 2015 at 12:30am*