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July 2, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 67.3 N, Jill pulls with 98.7 N in the northeast direction, and Jane pulls to the southeast with 133 N. (Since the donkey is involved with such uncoordinated people, who can blame it for ...
Friday, February 13, 2015 by pop

physics
What angle might give you the greatest height? How could you test this with a simulation that does not go off the page? What angle might give you the greatest distance? How could you test this with a simulation that does not go off the page? What angle will give you minimum ...
Friday, February 13, 2015 by Al

physics
the velocity time graph of a car start from rest and it accelerate uniformly at a rate 3m/s2 for 5seonds if attain the velocity which maintain for 1m the car then brought to rest by a uniform retardation after another 30m. draw the velocity time graph. find the acceleration. ...
Thursday, February 12, 2015 by simeon

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)
Thursday, February 12, 2015 by George

Physics
Two people are holding up the ends of a 4.40-kg wooden board that is l = 1.95 m long. A m = 2.00-kg box sits on the board, 0.50 m from one end, as shown below. What forces do the two people exert?
Thursday, February 12, 2015 by Maria

Physics
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during each of the segments A, B, and C? The scale for the time axis is 100 s per increment, and the scale for the velocity axis is 330 m/s per ...
Thursday, February 12, 2015 by Cetris

physics
A 3.6 kg rock is initially at rest at the top of a cliff. Assume that the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water. How high is the cliff if the temperature of 1.1 kg of water is raised ...
Thursday, February 12, 2015 by Anonymous

physics
A light, rigid rod l = 5.55 m in length rotates in the xy plane about a pivot through the rod’s center. Two particles of masses m1 = 9.8 kg and m2 = 2.4 kg are connected to its ends find the moment of inertia
Thursday, February 12, 2015 by d

physics
A student holds two lead weights, each of mass 12 kg. When the students’ arms are extended horizontally, the lead weights are 0.82 m from the axis of rotation and the student rotates with an angular speed of 1.5 rad/sec. The moment of inertia of student plus stool is 5.5 ...
Thursday, February 12, 2015 by d

physics
while rowing in a race, john uses his arms to exert a force of 165 N per stroke while pulling the .80 m. how much work does he do in 30 stroke?
Thursday, February 12, 2015 by Anonymous

physics
A light, rigid rod l = 5.55 m in length rotates in the xy plane about a pivot through the rod’s center. Two particles of masses m1 = 9.8 kg and m2 = 2.4 kg are connected to its ends. Determine the angular momentum of the system about the origin at the instant the speed of...
Thursday, February 12, 2015 by d

Physics
How does the energy stored in a capacitor change if (a) the potential difference is doubled, and (b) the charge on each plate is doubled, as the capacitor remains connected to a battery? Does the stored energy go up by a factor of 4 for both A and B?
Thursday, February 12, 2015 by Jep

Physics Dynamics
A sled of mass m = 70.0 kg is being pulled horizontally on a frictionless floor by a force F = 420 N that makes an angle 20.0o above the horizontal. What is the magnitude of the normal force applied by the ground on the sled?
Thursday, February 12, 2015 by Anonymous

Physics Dynamics
A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.69 of the person's regular weight. Calculate the magnitude of the acceleration of the elevator.
Thursday, February 12, 2015 by Anonymous

Physics Dynamics
A child slides down a slide with a 24o incline, and at the bottom her speed is precisely one-third what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child.
Thursday, February 12, 2015 by Anonymous

Physics Dynamics
An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
Thursday, February 12, 2015 by Anonymous

Physics Dynamics
Swimming at 2.00 m/s relative to still water, a swimmer heads directly across a river of width 80 m. He arrives 35 m downstream from the point directly across the river from his starting point. (a) What is the speed of the current in the river? (b) At what angle relative to ...
Thursday, February 12, 2015 by Anonymous

Physics
You are hitting a tennis ball against a wall. The 0.057-kg tennis ball traveling at 29 m/s strikes the wall and rebounds at the same speed. Earth is the object of reference. Determine the ball's change in momentum (magnitude).
Thursday, February 12, 2015 by Anonymous

Physics
An old building is being demolished by swinging a heavy metal ball from a crane. Suppose that such a 85kg ball swings from a 20-m-long wire at speed 10m/s as the wire passes the vertical orientation. What tension force must the wire be able to withstand in order not to break? ...
Thursday, February 12, 2015 by Anonymous

Physics
The two angled ropes used to support the crate in (Figure 1) can withstand a maximum tension of 1700N before they break. What is the largest mass the ropes can support? The two angles given are 30 degrees and 45 degrees.
Thursday, February 12, 2015 by Skyler

physics
an object is projected with a velocity of 10m/s from the ground level at an angle to the vertically, the total time of flight of projectile os 10secs. calculate angle when (g=10m/s) show workings
Thursday, February 12, 2015 by Anonymous

physics
A warehouse worker pushes a crate along the floor, as shown in the figure (Figure 1) , by a force of 9.0N that points downward at an angle of 45∘ below the horizontal. Q1 Find the horizontal component of the push Q2 Find the vertical component of the push.
Thursday, February 12, 2015 by Luis

Physics
Initial velocity is 21 m/s, the angle is 40 degrees, 20 meters away from the wall. How long is the ball in the air for?
Thursday, February 12, 2015 by Trevor

Physics
From her bedroom window a girl drops a water-filled balloon to the ground, 6.9 m below. If the balloon is released from rest, how long is it in the air?
Thursday, February 12, 2015 by Cetris

Physics
A skier moves 100.0 m horizontally, and then travels another 35.0 m uphill at an angle of 35.0º above the horizontal. What is the skier's displacement from his starting point?
Thursday, February 12, 2015 by Christian

Physics
A spaceship in deep space has a velocity of 4000 km/s and an acceleration in the forward direction of 6 m/s2. What is the acceleration of a ball relative to the spaceship after it is released in this spaceship?
Thursday, February 12, 2015 by Kay

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 by Ted

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 by Kayla

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 by Derp

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 by somoan

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 by sumbal

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 by jaggu

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 by anonymous

physics
What happens if we use water instead of kerosene in joules calorimeter experiment
Thursday, February 12, 2015 by krish

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 by Derp

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 by Anonymous

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 by Anonymous

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 by Tim

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 by Tim

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 by Anonymous

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 by Rene

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 by Anonymous

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 by Michelle

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 by Please Help

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 by Nick

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 by Anonymous

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 by Jen

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 by d

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 by mvlew

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 by Pissed off at this question rn

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 by Chris

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 by Gurleen

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 by xavier

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 by Marissa

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 by Matt

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 by Alan

Physics
Why does the potential inside a solid conductor not change?
Wednesday, February 11, 2015 by Anonymous

Physics
Does the potential inside a hollow conductor change and why?
Wednesday, February 11, 2015 by Anonymous

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 by Urgent Help

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 by Help!

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 by Help!

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 by Jay

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 by Jason

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 by Aaron

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 by ammu

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 by simeon

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 by physics

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 by physics

physics
Does the sun move to the west and accelerate east?
Wednesday, February 11, 2015 by julie

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 by Tanner

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 by Tanner

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 by Tanner

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 by Tanner

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 by Cait

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 by Cait

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 by Cait

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 by Cait

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 by Ashley

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 by Ashley

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 by Ashley

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 by Madison

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 by Madison

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 by Madison

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 by Anonymous

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 by mathew

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 by Alexis

Physics
Does the potential inside a hollow conductor change?
Tuesday, February 10, 2015 by Tia

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 by Jess

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 by Morgan

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 by Morgan

physics
Is the charge on the surface of the earth due to an excess or a deficit of electrons?
Tuesday, February 10, 2015 by moooose

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 by Ashlynn

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 by john

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 by Erin

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 by ?????halp

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 by Anonymous

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 by Anonymous

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 by sabahabib

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 by tms

Physics
The volume of a block of lead that has a mass of 33.6g would have to be?
Tuesday, February 10, 2015 by M

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