Monday
April 27, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
An object is placed in front of a concave mirror, 16.0 cm from the mirror's focal point. The image formed by the mirror is two times farther away from the focal point. Calculate the focal length of the mirror. There are actually two possible image distances di that satisfy...
Thursday, February 12, 2015 at 2:57pm

Physics
What is the maximum total force exerted on a 71 kg astronaut by her seat during the launch of the Space Shuttle?
Thursday, February 12, 2015 at 1:59pm

Physics
When man stands on a bathroom scale here on Earth, it reads 560N . Assume each planet to be a perfect sphere with the following parameters. What would his mass be on Mars if Mars has a mass of 6.419 x 10^23 kg and a radius of 3.396 x10^6 m? and what is the magnitude of the ...
Thursday, February 12, 2015 at 12:04pm

college physics 1
As part of a fundraiser, the Chancellor has agreed to bungee jump from a crane 45 m above a pool filled with Jello. The plan is for the bungee cord to stop the Chancellor just before his head enters the Jello. Your task is to select a bungee cord that will safely stop the ...
Thursday, February 12, 2015 at 9:21am

fristyear physics
two girls a and b weighting 40 and 30 kg both of them pull 14m held by them.they will meet when covers a distance of?
Thursday, February 12, 2015 at 6:15am

physics
a man raises a mass,m to a height ,h and then shifts it horizontally over a distance ,x. find the total work done against the force of gravity?
Thursday, February 12, 2015 at 3:22am

physics
A frictionless incline is 5.00 m long (the distance from the top of the incline to the bottom, measured along the incline). The vertical distance from the top of the incline to the bottom is 4.03 m. A small block is released from rest at the top of the incline and slides down ...
Thursday, February 12, 2015 at 1:25am

physics
What happens if we use water instead of kerosene in joules calorimeter experiment
Thursday, February 12, 2015 at 1:22am

Physics
How fast do you need to swing a 190-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 30 degree angle relative to the horizontal?
Thursday, February 12, 2015 at 12:42am

Physics
Two identical resistors are connected in parallel across a 26-V battery, which supplies them with a total power of 9.8 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The resistance of the other resistor remains unchanged...
Thursday, February 12, 2015 at 12:14am

physics
A 14-Ω loudspeaker, a 9.0-Ω loudspeaker, and a 3.2-Ω loudspeaker are connected in parallel across the terminals of an amplifier. Determine the equivalent resistance of the three speakers, assuming that they all behave as resistors. Answer: (1/14)+(1/9)+(1/3.2...
Thursday, February 12, 2015 at 12:05am

Physics
a BALL IS THROWN UPWARD WITH AN INITIAL VELOCITY OF 9.8 M/S FROM THE TOP OF A BUILDING. FILL A TABLE BELOW SHOWING THE BALLS POSITION,VELOCITY, and ACCELERATION AT THE END OF EACH OF THE 1ST 4SEC OF MOTION TIME(s) POSITION(M) VELOCITY(M/S) 1 2 3 4 Acceleration (M?S^2) Fill in ...
Wednesday, February 11, 2015 at 11:48pm

Physics
During a rElay race along a straight ROAD the 1st runner on a three person team runs D1 with a constant velocity v1. The runner then hands off the baton to the sEcond runner who runs d2 with a constant vElocity v2. The batton is then passed to the 3rd runner who completes the ...
Wednesday, February 11, 2015 at 11:36pm

Physics
The rms current in a 41-Ω resistor is 0.69 A. What is the peak value of the voltage across this resistor? Answer: V(rms) = A(ohms)(sqrt2)
Wednesday, February 11, 2015 at 11:24pm

Physics
Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)
Wednesday, February 11, 2015 at 11:05pm

physics
A box of mass 26 kg is hung by a thin string from the ceiling of an elevator. The string can hold up to 276.1 N and will break under larger tension force. How much can the maximum acceleration of the elevator be going upward so that the string does not break and continues to ...
Wednesday, February 11, 2015 at 10:40pm

physics
A man named Harold is standing in a train car that has no windows. Since there aren't any windows, he doesn't know how fast or in what direction the train is moving or whether it is accelerating or decelerating. Harold decides that he might be able to figure something ...
Wednesday, February 11, 2015 at 9:47pm

Physics
How fast do you need to swing a 180-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 35∘ angle relative to the horizontal?
Wednesday, February 11, 2015 at 9:25pm

Physics-Electricity
A toaster consists of 4 heating elements that are connected in parallel. The toaster is connected to a 240 V mains supply. When the toaster is switched on, a current of 2.5 A is drawn from the mains supply. Calculate the electrical energy used by a single heating element in ...
Wednesday, February 11, 2015 at 8:33pm

Physics
If the drive chain exerts a force of 2090 N at a radius of 5.00 cm, what is the angular acceleration of the wheel? (b) What is the tangential acceleration of a point on the outer edge of the tire? (c) How long, starting from rest, does it take to reach an angular velocity of ...
Wednesday, February 11, 2015 at 8:29pm

physics
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 0.0070m/s2 less than that at sea level (gsealevel = 9.83 m/s2). What is the observatory's altitude? Assume Rearth = 6.37 × 106 m.
Wednesday, February 11, 2015 at 8:29pm

physics
A cylindrical 9.16 kg pulley with a radius of 0.373 m is used to lower a 2.64 kg bucket into a well. The bucket starts from rest and falls for 3.94 s. What is the linear acceleration of the falling bucket? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s 2
Wednesday, February 11, 2015 at 7:58pm

Physics
The best sprinters can run a 100 m in 10.0 s. A 77.2 kg sprinter accelerates uniformly for the first 51.0 m to reach top speed, which he maintains for the remaining 49.0 m. What is the average horizontal component of force exerted on his feet by the ground during acceleration...
Wednesday, February 11, 2015 at 7:56pm

Physics
You are helping your friend move a new refrigerator into his kitchen. You apply a horizontal force of F = (202i − 161k) N to try and move the 75.0-kg refrigerator. The coefficient of static friction is 0.640. a) how much static friction force does the floor exert on the ...
Wednesday, February 11, 2015 at 7:46pm

Physics
A spring with a spring constant of 40.1 N/m is attached to different masses, and the system is set in motion. What is its period for a mass of 2.8 kg?
Wednesday, February 11, 2015 at 7:08pm

Physics
Cleveland is 480 km east of Chicago. A plane leaves Chicago with an air speed of 800km/h in a wind which blows [S 45 degrees W]. (A) what heading will the pilot take in order to fly with a ground speed which is directly east? (B) how long will it take to get to Cleveland?
Wednesday, February 11, 2015 at 6:55pm

Physics
A cannon ball is fired horizontally with an initial speed of 75 m/s from the top of a 50-m tall building. When the ball hits the ground, its velocity vector makes an angle θ with the horizontal. What is θ
Wednesday, February 11, 2015 at 6:28pm

Physics
A baseball player slides into third base with an initial speed of 3.8m/s. If the coefficient of kinetic friction between the player and the ground is 0.40, how far does the player slide before coming to rest?
Wednesday, February 11, 2015 at 6:28pm

physics
a tsunami originating in japan has a wavelength of 10^5 m and a period of 10 mins. how long does it take to travel 8000km?
Wednesday, February 11, 2015 at 6:26pm

Physics
Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.345. The objects have masses of m1 = 3.25 kg, m2 = 1.25 kg, and m3 = 2.50 kg, and the pulleys are frictionless. The Photo: w w w(dot)...
Wednesday, February 11, 2015 at 4:33pm

Physics
Why does the potential inside a solid conductor not change?
Wednesday, February 11, 2015 at 3:47pm

Physics
Does the potential inside a hollow conductor change and why?
Wednesday, February 11, 2015 at 3:46pm

Physics Help!!!!!!!!!!!!!!!!
Suppose you were asked to develop a concept of "automobile current" ( a current formed by moving cars) for traffic on an interstate or busy street near you. a) what would be the units of "automobile current"? b) what info would be the "automobile ...
Wednesday, February 11, 2015 at 2:52pm

Physics Help Please!
Suppose you work at an amusement park. Your boss has asked you to determine the "people current," a measurement of moving people coming through the entrance of the park. a) what would be the units of "people current?" b) what information would "people ...
Wednesday, February 11, 2015 at 1:04pm

Physics Help Please
Suppose you work at an amusement park. Your boss has asked you to determine the "people current," a measurement of moving people coming through the entrance of the park. a) what would be the units of "people current?" b) what information would "people ...
Wednesday, February 11, 2015 at 1:04pm

Physics
A cannon fires projectile (ordinarily called a cannonball) at an angle 85 degrees from the ground. The cannonball has a speed 150 m/s, and it is launched from hill 20 m above the plain where it will land.
Wednesday, February 11, 2015 at 11:56am

Physics
A car speeds up from 12 m/s to 20 m/s in 6.4s.If its mass is 1200 kg,what force must its engine provide ?
Wednesday, February 11, 2015 at 11:20am

PHYSICS
A variable length air column (closed on one end) is placed just below a vibrating wire of mass 5.00g, which is fixed at both ends. The length of the air column is gradually increased from zero until the first position of resonance (first harmonic) is observed at 34 cm. The ...
Wednesday, February 11, 2015 at 10:24am

physics
Two bodies have masses in ratio 3:4when a force is applied on the first body it moves with an acceleration of 6m/s2 how much acceleration will the same force produced in the body
Wednesday, February 11, 2015 at 1:23am

physics
a fruit drops from the top of a tree 40m tall, calculate. the time taken to reach the ground. the velocity just before it hits the ground.
Wednesday, February 11, 2015 at 1:01am

physics
find the resistance of 134m of No.20 copper wire at 20 degrees C (p=1.72x10^-6Ohom cm , A= 2.07x10^-2 cm ^2)
Wednesday, February 11, 2015 at 12:27am

physics
what is the electric force exerted on a test charge of 3.86 x 10^-5 C if it is placed in an electric field of magnitude 1.75 x 10^4 N/C ?
Wednesday, February 11, 2015 at 12:22am

physics
Does the sun move to the west and accelerate east?
Wednesday, February 11, 2015 at 12:05am

Physics
A 18.6 kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 202 N and breaks as the elevator accelerates. What was the elevator's minimum acceleration? (in m/s^2)
Wednesday, February 11, 2015 at 12:01am

Physics
If a curve with a radius of 91.5 m is perfectly banked for a car traveling 77.4 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 91.6 km/h?
Wednesday, February 11, 2015 at 12:01am

Physics
How many revolutions per minute would a 15.6 m diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point? Do not enter unit.
Wednesday, February 11, 2015 at 12:00am

Physics
At what minimum speed must a roller coaster be traveling when upside down at the top of a circle so that the passengers will not fall out? Assume a radius of curvature of 8.47 m. (in m/s)
Wednesday, February 11, 2015 at 12:00am

Physics
A device for training astronauts and jet fighter pilots is designed to rotate a trainee in a horizontal circle of radius 10.2 m. If the force felt by the trainee on her back is 7.61 times her own weight, how fast is she rotating? (in m/s) Express your answer in revolutions per...
Wednesday, February 11, 2015 at 12:00am

Physics
A child sitting 1.39 m from the center of a merry-go-round moves with a speed of 1.21 m/s. Calculate the centripetal acceleration of the child. (in m/s^2) Calculate the net horizontal force exerted on the child (mass = 22.5 kg). (in N)
Tuesday, February 10, 2015 at 11:59pm

Physics
An elevator in a tall building is allowed to reach a maximum speed of 3.55 m/s going down. What must the tension be in the cable to stop this elevator over a distance of 2.30 m if the elevator has a mass of 1270 kg including occupants? (in N)
Tuesday, February 10, 2015 at 11:58pm

Physics
A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 29.8° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.400 and 0.320, respectively. The box slides down unless the...
Tuesday, February 10, 2015 at 11:58pm

Physics
An 17.2 kg box is released on a 35.7° incline and accelerates down the incline at 0.274 m/s2. Find the friction force impeding its motion. (in N) How large is the coefficient of friction?
Tuesday, February 10, 2015 at 11:58pm

Physics
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.210 and the push imparts an initial speed of 3.50 m/s? (in m)
Tuesday, February 10, 2015 at 11:57pm

Physics
If the coefficient of kinetic friction between a 32.7 kg crate and the floor is 0.295, what horizontal force is required to move the crate at a steady speed across the floor? (in N) What horizontal force is required if Uk is zero? (in N)
Tuesday, February 10, 2015 at 11:57pm

Physics
What is the magnitude of the acceleration of two falling sky divers (mass 149 kg including parachute) when the upward force of air resistance is equal to one fourth of their weight? (in m/s^2) After popping open the parachute, the divers descend leisurely to the ground at ...
Tuesday, February 10, 2015 at 11:56pm

Physics
An elevator (mass 5000 kg) is to be designed so that the maximum acceleration is 0.0620 g. What is the maximum force the motor should exert on the supporting cable? (in N) What is the minimum force the motor should exert on the supporting cable? (in N)
Tuesday, February 10, 2015 at 11:56pm

Physics
A 0.133 kg baseball traveling 30.6 m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 11.4 cm. What was the average force applied by the ball on the glove? (in N)
Tuesday, February 10, 2015 at 11:55pm

physics
Mary applies a force of 71 N to push a box with an acceleration of 0.57 m/s2. When she increases the pushing force to 83 N, the box's acceleration changes to 0.86 m/s2. There is a constant friction force present between the floor and the box. a) what is the coefficient of ...
Tuesday, February 10, 2015 at 11:47pm

physics
Guy has to get a piano onto a 2.4 m high platform. He can use a 3.0 m long frictionless ramp or a 4.0 m long frictionless ramp. Which ramp will Guy use if he wants to do the least amount of work? Either ramp as the work done is same in both cases. The shorter ramp will require...
Tuesday, February 10, 2015 at 11:21pm

Physics
A magnifier has a magnification of 6x. How far from the lens should an object be held so that its image is at the near point distance of 25 cm? I tried doing the problem by using the equation M = 25cm / f. M = 25 cm/6 = 4.17 cm However when I put the answer into mastering ...
Tuesday, February 10, 2015 at 11:19pm

Physics
Does the potential inside a hollow conductor change?
Tuesday, February 10, 2015 at 11:16pm

Physics
A 65.0 kg ice skater moving to the right with a velocity of 2.5 m/s throws a 0.15 kg snowball to the right with the velocity of 32.0 m/s relative to the ground. a. What is the velocity of the ice skater after throwing the snowball? disregard the friction between the skates and...
Tuesday, February 10, 2015 at 9:20pm

Physics
A bullet with a velocity of 200 m/s is shot at a 2-kg block resting on a horizontal frictionless surface. The bullet imbeds in the block and the bullet-block system slides across the surface with a speed of 5 m/s. A) what is the mass of the bullet? B)The coefficient of ...
Tuesday, February 10, 2015 at 8:25pm

Physics
A 1000 kg car moving at 27 m/s from left to right collides head-on with a 1500 kg car moving at 30 m/s right to left. A) Determine the magnitude and direction of the velocity of the wreckage after the collision. B) If a 1000 kg car moving at 36 m/s from left to right collides...
Tuesday, February 10, 2015 at 8:25pm

physics
Is the charge on the surface of the earth due to an excess or a deficit of electrons?
Tuesday, February 10, 2015 at 8:04pm

Physics
At its highest point the pendulum is 1.2 meters off the ground and has a gravitational potential energy of 62 Joules. If the gravitational potential energy is 10 Joules at its lowest point. What is the pendulums kinetic energy at this point? Please help!
Tuesday, February 10, 2015 at 7:28pm

physics
If a rubber tire having a weight of 18.0lbs requires a force of 38.0N to keep it in uniform motion on a level highway find the coefficient of kinetic friction.
Tuesday, February 10, 2015 at 5:44pm

physics
When swimming across a river you swim to the east at 1.0 mph while the river flows southward at 2.4 mph. Your velocity is a superposition of these two velocities. What is your speed (i.e. the magnitude of your velocity)? i have no idea how to do this please help
Tuesday, February 10, 2015 at 5:38pm

physics 30
Given the reaction 3 NO2(g) + H2O(l) ¨ 2 HNO3(l) + NO(g) ƒ¢rH = -72.0 kJ, calculate the molar enthalpy of reaction, rH for: 1) NO2(g) 2) H20 (l) 3) HNO3 (l) 4) NO (g) Express you answer in Kj/mol
Tuesday, February 10, 2015 at 3:51pm

physics
You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 7.31 ° above the horizontal. Approximately how far (in ...
Tuesday, February 10, 2015 at 3:05pm

physics
What is the mass of a man if he accelerates at 42 m/s/s and has a mass of 112 kg?
Tuesday, February 10, 2015 at 1:29pm

physics
a charge of 4 nc is located at the origin and -5nc is located at x axis.find yhe electric intencity at y =2m along y-axis?
Tuesday, February 10, 2015 at 1:15pm

physics
The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 grams. The velocity of the stone when it reached the target was 15.0 meters/second. What was the value of the kinetic energy of the stone when it ...
Tuesday, February 10, 2015 at 12:18pm

Physics
The volume of a block of lead that has a mass of 33.6g would have to be?
Tuesday, February 10, 2015 at 11:33am

Physics
A coin rests on a record 0.15 m from its center. The record turns on a turntable that rotates at variable speed. The coefficient of static friction between the coin and the record is 0.30. What is the maximum coin speed at which it does not slip?
Tuesday, February 10, 2015 at 7:13am

Physics
A bike and cyclist have a combined mass of 75 kg. If the brakes can apply a maximum force of 20 N, what is the shortest time in which the cyclist can stop?
Tuesday, February 10, 2015 at 6:02am

Physics
I don't really understand how to do the problem with just the constants...or in formation of a formula. Much help on explaining how to do it would be much appreciated. 1) Two equal but opposite charges re separated by a distance d. Determine a formula for VBA = VB – ...
Tuesday, February 10, 2015 at 2:16am

physics
I need to find the sum of energy in this device : A green support turns clockwise at w. A motor is fixed on that support. The stator of this motor turns clockwise at w (it is on the support). The rotor of the motor turns clockwise at 2w (lab reference). On the rotor there is a...
Tuesday, February 10, 2015 at 1:26am

University Physics II
1. A voltage of 13 V is applied across the ends of a piece of copper wire 8 cm long. The mass of an electron is 9.11 × 10−31 kg and its charge is 1.6 × 10−19 C. What is the magnitude of the electron’s acceleration? Answer in units of m/s2. 2. After...
Monday, February 9, 2015 at 11:57pm

Physics
Michael Jordan’s vertical leap was measured to be 122 cm. What was his takeoff speed, and how long would he be in the air?
Monday, February 9, 2015 at 11:11pm

Physics
On October 9, 1992 a 12.3 kg meteorite struck a car in Peekskill, NY; leaving a dent 22 cm deep in the trunk. If the meteorite struck the car with a speed of 550 m/s, what was the magnitude of the acceleration (assuming it was constant)?
Monday, February 9, 2015 at 11:10pm

Physics
Assume the brakes in your car create a constant acceleration of 4.2 m/s2 regardless of your speed. How long does it take to stop if you are initially traveling 50 km/h? What distance do you go while stopping? Repeat the calculations for an initial speed of 100 km/h. What do ...
Monday, February 9, 2015 at 11:08pm

Basic Physics
An unknown charge sits on a conducting spherical shell of radius 10 cm. If the electric field 15 cm from the center of the sphere has the magnitude 3.0E3 N/C and is directed radially inward, what is the net charge on the sphere?
Monday, February 9, 2015 at 10:16pm

physics
What is an object that is launched into the air and undergoes free fall
Monday, February 9, 2015 at 9:46pm

physics
A 27 g ice cube at −25◦C is dropped into a container of water at 0◦C. How much water freezes onto the ice? The specific heat of ice is 0.5 cal/g · ◦ C and its heat of fusion of is 80 cal/g. Answer in units of g.
Monday, February 9, 2015 at 8:26pm

Physics
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with...
Monday, February 9, 2015 at 8:19pm

Physics
A proton is initially at rest in empty space, when suddenly an electric field of magnitude 8.0 x 10 4 n/c and direction due east is turned on. what is the magnitude and direction of the initial acceleration of the proton? Repeat the problem, but with an electron.
Monday, February 9, 2015 at 7:40pm

Physics
A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 23.7 minutes at an average speed of 6.31 m/s. During the second part, she rides for 25.0 minutes at an average speed of 4....
Monday, February 9, 2015 at 7:19pm

physics
A box of books weighing 349 N moves with a constant velocity across the floor when it is pushed with a force of 434 N exerted downward at an angle of 37.9◦ below the horizontal. Find μk between the box and the floor.
Monday, February 9, 2015 at 6:03pm

physics
a basketball player tries to make a half court jumpshot releasing the ball at the height of the basket assuming the ball is lunch at 51 degrees 14 meters from the basket what velocity musta player give the ball
Monday, February 9, 2015 at 4:46pm

physics
a basketball player tries to make a half court jumpshot releasing the ball at the height of the basket assuming the ball is lunch at 51 degrees 14 meters from the basket what velocity musta player give the ball
Monday, February 9, 2015 at 4:45pm

Physics
0.5kg of orange squash at 30 degrees celcius is placed in a refrigerator which can remove heat at an average rate of 20J/s.How long will it take to cool the orange squash to 5 degrees celcius (the specific heat capacity is 4200J/kg degrees celcius)
Monday, February 9, 2015 at 1:54pm

physics 105
How many cubic feet will 44lb of CO2 occupy at STP
Monday, February 9, 2015 at 12:53pm

Physics
Calculate the final speed of a skier who skis down a 70.8 m high hill, if her initial speed is 2.18 m/s
Monday, February 9, 2015 at 12:36pm

College physics
How much work (kJ) must a car produce to drive 239 miles if an average force of 369 N must be maintained to overcome friction?
Monday, February 9, 2015 at 12:35pm

Physics
When going up stairs does a person who has more mass do more work and exert more power?
Monday, February 9, 2015 at 12:28pm

Physics
How do I find the recoil velocity of the earth immediately after the popper popped?
Monday, February 9, 2015 at 11:32am

physics
How fast do you need to swing a 180-g ball at the end of a string in a horizontal circle of 0.6-m radius so that the string makes a 33∘ angle relative to the horizontal?
Monday, February 9, 2015 at 11:25am

Physics
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with...
Monday, February 9, 2015 at 10:11am

maths physics
A lift of mass 1500 kg is raised by means of a rope passing round a drum of diameter 1.50 m. Given that the lift is accelerating upwards at 0.255 m s-2, draw a free body diagram of the lift, calculate the tension in the rope, the moment applied to the drum and the angular ...
Monday, February 9, 2015 at 7:37am

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