Wednesday

August 20, 2014

August 20, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

The magnitude of two vectors p and q differ by 1. The magnitude of their resultant makes an angle of tan inverse ( 3 / 4 ) with p. The angle between p and q is
*Friday, July 4, 2014 at 6:26am*

**physics**

The greatest and least resultant of two forces acting at a point are 16N and 4N. If they are acting at an angle 120 degrees with one another their resultant is A. root 38N , B.root 76N, C.root 19N, D.none
*Friday, July 4, 2014 at 6:23am*

**physics**

Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.
*Friday, July 4, 2014 at 4:23am*

**physics**

A ship is moving West at a velocity of 30 mph and a person is on deck walking EAST at a velocity of 5 mph. To the observer on shore, what is the relative speed of the person walking on the ship’s deck?
*Thursday, July 3, 2014 at 9:13pm*

**physics**

How would I answer number 3? 1. A sumo wrestler originally jumps 10 cm above a trampoline but has the same total energy of a small ball that was 200 cm higher than the trampoline. What causes this equivalency? 2. If a 40 kg gymnast and a 400 kg sumo wrestler each dropped from ...
*Thursday, July 3, 2014 at 8:07pm*

**Physics**

A sumo wrestler originally jumps 10 cm above a trampoline but has the same total energy of a small ball that was 200 cm higher than the trampoline. What causes this equivalency?
*Thursday, July 3, 2014 at 7:02pm*

**Physics -- check answers please**

Use g=10 N/kg in this assignment. 1. What is the gravitational energy (relative to the unstretched surface of the trampoline) of the 20 kg ball at its apex 2 m above the trampoline? I got 400 J 2. What is the kinetic energy of the ball just before impacting the trampoline? I ...
*Thursday, July 3, 2014 at 5:56pm*

**Physics**

fill in the blank ( Energy and momentum unit) 1. the work done to stretch a spring is not equal to the to force multiplied by displacement because force is ____ as the spring stretches 2. A child goes down a slide at the playground, gaining speed as she goes. Her momentum ____...
*Thursday, July 3, 2014 at 2:06pm*

**PHYSICS**

a girl weighing 620 n sits in the middle of a 2.8 m long hammock which sags 1.2m below th e point of support. What force is exerted by each of the two ropes supporting the hammock
*Thursday, July 3, 2014 at 1:38pm*

**Physics (A man in the lift)**

A man of mass m is standing in an elevator. The elevator is accelerating downward at g/k, where k>1 and g is the gravitation acceleration. If the force on the man by the elevator's floof jmg, where j is a constant and k= a/(b+cj), where gcd(|a|,|b|,|c|)=1, what is a+b+c...
*Thursday, July 3, 2014 at 12:56pm*

**Astro-Physics(Binary Star System)**

In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the both cases are the same...
*Thursday, July 3, 2014 at 12:45pm*

**Physics**

Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the ground at the n-th click, in metres, be ...
*Thursday, July 3, 2014 at 12:17pm*

**physics**

A trunk of mass 15 kg is on the floor. The trunk has a very small initial speed. The acceleration of gravity is 9.8 m/s2 . What constant horizontal force pushing the trunk is required to give it a velocity of 10 m/s in 20 s if the coefficient of sliding friction between the ...
*Wednesday, July 2, 2014 at 10:42pm*

**Physics**

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 64 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m Can you...
*Wednesday, July 2, 2014 at 10:26pm*

**Physics**

A flowerpot falls from a window sill 37.7 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2 . Can you tell me the steps and why?
*Wednesday, July 2, 2014 at 10:20pm*

**Math**

he physics department of a college has 9 male professors, 8 female professors, 10 male teaching assistants, and 13 female teaching assistants. If a person is selected at random from the group, find the probability that the selected person is a teaching assistant or a female
*Wednesday, July 2, 2014 at 9:42pm*

**Physics**

A net force of 44N accelerates a 5.4-kg mass over a distance of 13 m. a. What is the increase in kinetic energy of the mass?
*Wednesday, July 2, 2014 at 7:27pm*

**Physics**

A rope applies a horizontal force of 208 N to pull a crate a distance of 1.91 m across the floor. A frictional force of 154 N opposes this motion. (a) What is the work done by the force applied by the rope? (b) What is the work done by the frictional force? What is the total ...
*Wednesday, July 2, 2014 at 7:16pm*

**physics**

A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E . E4_1? All the bars in truss ABC have constant cross section and are made of a homogeneous ...
*Wednesday, July 2, 2014 at 5:46pm*

**Physics**

The Leyden jar, invented by chance in 1746, was one of the earliest types of capacitors (see the figure below), made by covering the inner and outer surfaces of a glass jar with conducting layers (for example, aluminum foil). It is a good approximation to treat the Leyden jar ...
*Wednesday, July 2, 2014 at 5:06pm*

**Physics**

A 42.0 kg swimmer with an initial speed of 1.50 m/s decides to coast until she comes to rest. If she slows with constant acceleration and stops after coasting 2.00 m, what was the magnitude of the force exerted on her by the water?
*Wednesday, July 2, 2014 at 5:02pm*

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? ...
*Wednesday, July 2, 2014 at 4:22pm*

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
*Wednesday, July 2, 2014 at 4:08pm*

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
*Wednesday, July 2, 2014 at 2:31pm*

**Physics**

A horizontal disk with a radius of 23 m ro- tates about a vertical axis through its center. The disk starts from rest and has a constant angular acceleration of 5.5 rad/s2. At what time will the radial and tangen- tial components of the linear acceleration of a point on the ...
*Wednesday, July 2, 2014 at 2:27pm*

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? ...
*Wednesday, July 2, 2014 at 2:10pm*

**physics**

A golfer, standing on a fairway, hits a shot to a green that is elevated 5.80 m above the point where she is standing. If the ball leaves her club with a velocity of 46.3 m/s at an angle of 36.0° above the ground, find the time that the ball is in the air before it hits ...
*Wednesday, July 2, 2014 at 1:34pm*

**Physics**

Two point charges q1 = +5.6 10-8 C and q2 = -5.7 10-8 C. |-----q2 | | | q1----A----------B from the q2 to A is 10cm from the q1 to A is 5cm from A to B is 10 cm (a) Find the potential at A. (b) Find the potential at B. (c) Find the potential difference.
*Wednesday, July 2, 2014 at 12:27pm*

**physics**

Find the total displacement of a body in 8seconds starting from rest with an acceleration of 2cm/sec2
*Wednesday, July 2, 2014 at 12:05pm*

**Physics**

In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic ...
*Wednesday, July 2, 2014 at 11:45am*

**Physics- check answer please**

I am supposed to fill in the blanks without a word bank. 1. I you push a crate with 40 N of force at an angle of 30 degrees and your friend pushes with a force of 40 N horizontally, the amount of work you are doing is _____ the amount of work your friend is doing on the crate ...
*Wednesday, July 2, 2014 at 11:39am*

**Physics**

1. How is average speed related to instantaneous speed? What certain conditions must be met for the two variables to have the same or close value? 2. Cite one practical example on the use of the concepts of instantaneous speed, average speed in observing safety on the road.
*Wednesday, July 2, 2014 at 5:33am*

**Physics**

An astronaut of mass m in a spacecraft experiences a gravitational force F=mg when stationary on the launchpad. What is the gravitational force on the astronaut when the spacecraft is launched vertically upwards with an acceleration of 0.2g? A 1.2mg B mg C 0.8mg D 0 Ans= B ...
*Tuesday, July 1, 2014 at 11:20pm*

**PHYSICS**

Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 332 N to the right. If they pull in opposite directions, the raft experiences a net external force of 122 N to the left. Draw a free body ...
*Tuesday, July 1, 2014 at 9:50pm*

**physics 1**

You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.13 s, and the velocity of the car decreases to +4.90 m/s. The car's deceleration has a magnitude of 3.55 m/s2 during this time. What is the car's displacement?
*Tuesday, July 1, 2014 at 9:45pm*

**physics**

A particle (m=3*10^-6 g, q=5*10^-6 C) moves in a uniform magnetic field given by (60j) mT. At t=0 the velocity of the particle is equal to (30j - 40k)m/s. The subsequent path of the particle is? I know that the answer is: helical with a 40-cm radius. But i dont know the ...
*Tuesday, July 1, 2014 at 3:29pm*

**Physics**

Which of the following is an inertial frame of reference? a) a child on a moving swing observes the child next to them moving in sync b) a child on a moving swing observes a ball that they throw to their parents standing on the ground c) a child observes the motion of the ...
*Tuesday, July 1, 2014 at 2:56pm*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*Tuesday, July 1, 2014 at 12:28pm*

**physics**

1. what happens to the force required for an object to maintain circular motion if the period is halved (goes twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered 2. In a pulley problem involving an inclined plane: a) ...
*Tuesday, July 1, 2014 at 12:17pm*

**physics**

A car moves with a speed of 30km/hr for half an hr,25km/hr for 1he and 40km/hr for 2hrs. What is the average speed of car?
*Tuesday, July 1, 2014 at 5:30am*

**physics**

what force parallel to an inclined plane of height 3 meter and base 4 meter can just support a block mass 500 gram on the plane ? the coefficient of friction 0.25
*Tuesday, July 1, 2014 at 2:33am*

**Physics**

You take a 10 N block and lift it 1 meter vertically from the floor and then place it back down on the floor. How much work do you do during this motion? W = F x d x cos(theta) So lifting it does work and the lowering it does negative work won't that cancel out to get OJ ...
*Tuesday, July 1, 2014 at 2:13am*

**PHYSICS**

HOW CAN YOU TELL WETHER 2 CHARGES HAVE THE SAME MAGNITUDE
*Tuesday, July 1, 2014 at 1:11am*

**Physics**

The velocity acquired by a body moving with uniform acceleration is 12m/s in 2 seconds and 18m/s in 4 seconds.Find the initial velocity of the body.
*Tuesday, July 1, 2014 at 12:02am*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*Monday, June 30, 2014 at 11:43pm*

**Physics**

A 20 kg box approaches the foot of a 30 degree inclined plane with a speed of 10 m/s. the coefficient of friction between the box and the inclined plane is 0.2. (a) How far up the inclined plane will the box go? (b) If the box slides back down the inclined plane, what is its ...
*Monday, June 30, 2014 at 9:27pm*

**physics**

A girl inside a room is looking at the window and sees a volleyball passing outside the window of width w and height d. The ball appears from the upper left corner A of the window and disappears at the lower right corner B in t0 second. The girl knows that the ball has been ...
*Monday, June 30, 2014 at 8:11pm*

**Physics**

Four point charges are at the corners of a square of side a as shown in the figure below. Determine the magnitude and direction of the resultant electric force on q, with ke, q, and a left in symbolic form. (Let B = 2.5q and C = 8q. Let the +x-axis be pointing to the right.) ...
*Monday, June 30, 2014 at 3:00pm*

**physics**

a bullet travelling horizontally at a speed of 350 m/s hits a board perpendicular to the surface, passes through it and emerges on the other side at a speed of 210 m/s . if the board is 4.00 cm thick, how long does the bullet takes to pass through it ?
*Monday, June 30, 2014 at 10:36am*

**physics**

pilots can survive radial acceleration up to 9g(88m/s^2). can a fighter pilot flying at a constant speed of 500m/s and in a circle that has a diameter of 8800 m survive to tell about his experience?
*Monday, June 30, 2014 at 8:37am*

**physics, science**

What effect does friction have upon a) ball bounce angle, and b) ‘speed’ of the court? Refer to clay and grass courts to help illustrate your answer. (4 marks) please help!
*Monday, June 30, 2014 at 6:52am*

**physics**

A car traveling at2.24m/s skids and stops in 2.55s determine the skidding distance of car
*Monday, June 30, 2014 at 2:28am*

**physics**

A missile is fired from a launcher with an initial velocity of 250 m/s at a target located 500 m above the launcher and at a horizontal distance of 3000 m. Determine the following: i) The possible firing angles required to hit the target. ii) The maximum height reached for all...
*Sunday, June 29, 2014 at 8:43pm*

**Physics**

(a) Calculate the linear acceleration of a car, the 0.280 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. (m/s2) (b) How many revolutions do the tires make in 2.50 s if they start from rest? (rev) (c) What is their final angular ...
*Sunday, June 29, 2014 at 8:06pm*

**Physics**

You and a friend are playing a game of squirt-gun tag in a maze. Suddenly you see your friend's image in a small planar mirror (see illustration). You take a shot over the barrier in front of you and find that your friend is just at the end of the 7.0 m range of your ...
*Sunday, June 29, 2014 at 5:05pm*

**Physics**

A large store escalator that is designed to transfer customers to one floor to another, a vertical distance of 8.0m. It takes each person 20 seconds to ride from bottom to top of the escalator. Explain how you would determine the power of the escalator motor.
*Sunday, June 29, 2014 at 1:06am*

**physics**

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. I calculated the acceleration and got <-3,-7,...
*Saturday, June 28, 2014 at 6:14pm*

**physics**

1. the applied force on a stationary object is less than the maximum force of static friction. Which of the statements are false a) the object will move backwards b) the actual force of static friction will be equal to the applied force c) the object will remain stationary ...
*Saturday, June 28, 2014 at 5:20pm*

**physics**

A 6 kg box with initial speed 5 m/s slides across the floor and comes to a stop after 1.4 s. a.What is the magnitude of the average net force on the box? b.You put a 3 kg block in the box, so the total mass is now 9 kg, and you launch this heavier box with an initial speed of ...
*Saturday, June 28, 2014 at 5:12pm*

**Physics**

In projectile motion, how would you find the final velocity of the object just before it hits the ground a) find the second vertical velocity b) add the final and horizontal velocities directly c)add the final and horizontal velocities as vectors d) add the final and ...
*Saturday, June 28, 2014 at 4:24pm*

**physics**

A referee tosses a coin straight up with a velocity of 5.25 m/s, how high does it go above its point of release? (Hint: How fast is it moving at the maximum height?)
*Saturday, June 28, 2014 at 3:34pm*

**Physics**

Is there normal contact force on a frictionless surface?
*Saturday, June 28, 2014 at 12:32pm*

**physics**

a stone is thrown straight up from a 50m high building and hits the ground at a speed of 37.1m/s. What is the initial velocity and what is the maximum height above the ground that the stone reaches?
*Saturday, June 28, 2014 at 11:27am*

**physics**

a car is driven off the edge of that is 54.0 m high. the point of impact is 130m from the base of the cliff. how fast was the car traveling in (miles/hr) when it went over the cliff?
*Saturday, June 28, 2014 at 9:41am*

**physics**

with an initial speed of 260km/h a train takes 1.50 x 10^3 m to stop on a level track. assuming the 'deceleration' is constant. what is the time in seconds taken for stopping?
*Saturday, June 28, 2014 at 9:38am*

**physics**

what was the initial velocity of a race car traveling down a long straight track if it accelerates at 5.79m/s^2 and ends up going 163km/h in a time of 3.60 seconds?
*Saturday, June 28, 2014 at 9:35am*

**Physics**

What happens when we bring a mercury barometer to the moon?
*Saturday, June 28, 2014 at 9:26am*

**Physics**

A person with a mass of 55kg climbs a tower with a height of 11m in 25 minutes. What power is produced?
*Friday, June 27, 2014 at 11:53pm*

**Physics**

A car is traveling at 11.0 m/s, and the driver sees a traffic light turn red. After .59 s (the reaction time), the driver applies the brakes, and the car decelerates at 8 m/s^2. What is the stopping distance of the car, as measured from the point where the driver first sees ...
*Friday, June 27, 2014 at 10:56pm*

**physics**

An object with a mass of 50.0 g displaces 230.0 ml of water when it is completely immersed. What is the buoyant force on the mass? (Use g = 9.8 N/kg as necessary.)
*Friday, June 27, 2014 at 10:12pm*

**Physics**

A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
*Friday, June 27, 2014 at 5:06pm*

**Physics**

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically. A drop that breaks loose from the tire on one turn rises ...
*Friday, June 27, 2014 at 2:20pm*

**physics**

Given: vector a+b+c= 0. Out of the three vectors a,b and c two are equal in magnitude. The magnitude of the third vector is √2 times that of either of the two having equal magnitude. The angles between the vectors are:
*Friday, June 27, 2014 at 1:59pm*

**physics**

A car is moving on a straight road due north with a uniform speed of 50km h^-1 when it turns left through 90°. It the speed remains unchanged after turning, the change in the velocity of the car in the turning process is :
*Friday, June 27, 2014 at 1:54pm*

**physics**

A soccer ball travelling at 15 m/s [E] bounces off of a goal post and ends up moving 12 m/s [S 30¡Æ E]. If the ball was in contact with the post for 0.10 seconds, calculate the acceleration of the ball.
*Friday, June 27, 2014 at 1:44pm*

**physics**

a man stands on the roof of a 15.0m tall building and throws a rock with a velocity of magnitude 30.0m/s at an angle of 33 degrees above the horizontal. ignoring resistance calculate the horizontal distance from the base of the building to the point where the rock strikes the ...
*Friday, June 27, 2014 at 12:47pm*

**physics**

a long jumper takes off at an angle of 20 degrees with the horizontal and reaches a maximum height of 0.55 meters at mid- flight. how far did she jump?
*Friday, June 27, 2014 at 12:44pm*

**Physics**

What happens to potential energy during melting
*Friday, June 27, 2014 at 12:28pm*

**Physics help**

how might life be different if static friction did not exist? give three examples and reference formulas to support your answers I have three examples but I do not understand what the questions mean by reference formulas
*Friday, June 27, 2014 at 12:06pm*

**Physics multiple choice**

1. What happens to the force required for an object to maintain circular motion if the period is halved (goes around twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered my answer: c 2. Which is true a) the ...
*Friday, June 27, 2014 at 12:05pm*

**Physics**

1. A ball is launched from a cliff with an initial velcity of 10 m/s at an angle of 40 degrees above horizontal. If the ball lands 24 m away, determine the height of the cliff. 2. if the mass A is 1 kg and the mass of B is 6.0 kg, determine the acceleration of the system and ...
*Friday, June 27, 2014 at 12:05pm*

**physics**

A 75.00-g sample of an unknown metal is heated to 52.00°C. It is then placed in a coffee cup calorimeter filled with water. The calorimeter and the water inside have a combined mass of 225.0 g and an overall specific heat of 2.045 J/(gi°C). The initial temperature of ...
*Friday, June 27, 2014 at 11:37am*

**physics**

A block of mass 2.5 kg is pushed up against the vertical wall by a force of 60 N acting at 47◦ to the ceiling. The coefficient of kinetic friction between the block and the wall is 0.67. The acceleration of gravity is 9.8 m/s2 . Find the work done by this force in moving...
*Friday, June 27, 2014 at 10:58am*

**Physics**

A motorcycle is travelling at a constant acceleration in a straight line. When it passes by the first lamp post, it is travelling at 10ms-1. When is passes by the next lamp post which is 200m from the first lamp post, the motor cycle is travelling at 16 ms-1. What is the ...
*Friday, June 27, 2014 at 7:14am*

**Physics . pls help me :)**

Two train cars are on a straight, horizontal track. One car starts at rest and is put in motion with a constant acceleration of 2m/s^2. This car moves towards a second car that is 30 away. The second car is moving away from the first car and is traveling at a constant speed of...
*Friday, June 27, 2014 at 6:10am*

**physics**

140
*Friday, June 27, 2014 at 5:59am*

**physics**

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel, of radius 0.363 m, and observes that drops of water fly off tangentially. She measures the height reached by drops moving vertically (Fig. P10.63). A drop that breaks loose ...
*Friday, June 27, 2014 at 4:45am*

**Physics (HEELPPP)**

A coin with a diameter of 1.90 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 14.4 rad/s and rolls in a straight line without slipping. If the rotation slows with an angular acceleration of magnitude 1.88 rad/s2, how far ...
*Friday, June 27, 2014 at 2:02am*

**physics**

A stone is projected up with a vertical velocity u, reaches upto a maximum height h. When it is at a height of 3h/4 from the ground, the ratio of KE and PE at that point is: (consider PE=0 at the point of projection) a]1:1 b]1:2 c]1:3 d]3:1
*Friday, June 27, 2014 at 1:39am*

**Physics**

how might life be different if static friction did not exist? give three examples and reference formulas to support your answers I have three examples but I do not understand what the questions mean by reference formulas
*Thursday, June 26, 2014 at 11:32pm*

**Physics**

1. A ball is launched from a cliff with an initial velcity of 10 m/s at an angle of 40 degrees above horizontal. If the ball lands 24 m away, determine the height of the cliff. 2. if the mass A is 1 kg and the mass of B is 6.0 kg, determine the acceleration of the system and ...
*Thursday, June 26, 2014 at 10:35pm*

**Physics**

1. What happens to the force required for an object to maintain circular motion if the period is halved (goes around twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered my answer: c 2. Which is true a) the ...
*Thursday, June 26, 2014 at 10:35pm*

**Physics**

What is the total pressure, in atmospheres, of a 10.0 L container that contains 10 moles of nitrogen gas and 10 moles of oxygen gas at 300 K? I tried using PV=nRT and added both P together but kept getting the wrong answer. n=10, T=300 K, V=1x10^-3 m^3
*Thursday, June 26, 2014 at 10:34pm*

**physics**

One mole of titanium (6 1023 atoms) has a mass of 48 grams, and its density is 4.54 grams per cubic centimeter, so the center-to-center distance between atoms is 2.60 10-10 m. You have a long thin bar of titanium, 2.4 m long, with a square cross section, 0.11 cm on a side. You...
*Thursday, June 26, 2014 at 8:47pm*

**Physics**

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1500 kg and was approaching at 9.00 m/s due south. The second car has a mass of 700 kg and was approaching at 15.0 m/s due west. (a) Calculate the final velocity of the cars. (b) ...
*Thursday, June 26, 2014 at 5:07pm*

**Physics**

A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 5.9 m due east. For the second putt, the ball travels 2.4 m at an angle 20° north of east. The third putt is 0.50 m due north. What displacement (...
*Thursday, June 26, 2014 at 4:54pm*

**physics please help!!**

find the temperature of the hot reservoir of a carnot engine that has QH=1575j that does work on a 200kg crate, caussing it to go from rest to a velocity of 2.35m/s along the horizontal frictionless surface. Tc=100K
*Thursday, June 26, 2014 at 3:23pm*

**physics**

An athlete runs from one end to the other end of a semicircular track whose radius is 70m. What is the total distance covered by the athlete and what is his displacement?
*Thursday, June 26, 2014 at 11:54am*

**science..physics**

An athlete runs from one end to the other end of a semicircular track whose radius is 70m.what is the total distance covered by the athlete and what is his displacement?
*Thursday, June 26, 2014 at 11:44am*

**Physics**

A hydrogen atom is at the earth's surface. The electron and proton in the atom are separated by a distance of 5.29x10^-11m. What is the ratio of the magnitude of the electrical force exerted by the proton on the electron to the weight of the electron?
*Thursday, June 26, 2014 at 10:30am*

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