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October 25, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
Romeo is chucking pebbles gently up to juliet’s window, and he wants the pebbles to hit the window with only a horizontal component of velocity. He is standing at the edge of a rose garden 4.5 m below her window and 5.0 m from the base of the wall (Fig. 3-34). How fast ...
Sunday, August 3, 2014 at 9:44pm

Physics
A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?
Sunday, August 3, 2014 at 7:14pm

Physics
A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?
Sunday, August 3, 2014 at 7:13pm

Physics
How far from a converging lens with a focal length of 15 cm should an object be placed to produce a real image which is half the size of the object? How do you solve this? Thanks!
Sunday, August 3, 2014 at 1:56pm

physics
two masses are attached to both ends of a flexible cord passing through a friction less pulley. if the system is at rest, find the tensions at object A and object B. Object A = Object B. A=60 grams.
Sunday, August 3, 2014 at 8:03am

physics
what must be the mass of the log to be lifted up by the hand, if the muscle cross sectional area is 17 cm^2?
Sunday, August 3, 2014 at 7:59am

physics
an heating coil of R=100ohm is connected to 220v supply. calculate time taken if the coil heats 1kg of water from 25degree Celsius to 50degree Celsius
Sunday, August 3, 2014 at 7:47am

Physics ASAP
A proton, traveling with a velocity of 6.8 × 106 m/s due east, experiences a magnetic force that has a maximum magnitude of 8.6 × 10-14 N and direction of due south. What are the magnitude and direction of the magnetic field causing the force? If the field is up, ...
Sunday, August 3, 2014 at 6:59am

Physics
Two charged particles are fixed on the x-axis 11 cm apart. The one on the left has a net charge of +25uc and the one on the right has a net charge of -15uc. What is the magnitude of the electric field 15 cm to the right of the negative charge? How do you solve this problem? ...
Sunday, August 3, 2014 at 1:27am

physics
two ice skaters initially at rest push each other.if one skater whose mass is 60kg has a velocity of 2m/s.find the velocity of other skater whose mass is 40kg
Sunday, August 3, 2014 at 12:49am

physics
why is the following situation impossible? a normally proportioned adult walk briskly along a straight line in the +x direction, standing straight up and holding his right arm vertical and next to his body so that the arm does not swing. his right hand holds a ball at his side...
Saturday, August 2, 2014 at 11:49pm

Physics
If the thickness of the probe in the direction of B is 1.97 mm, calculate the charge-carrier density (each of charge e).
Saturday, August 2, 2014 at 7:44pm

College Physics 2.. HELP
A 6 cm high object is placed 43ncm from a converging lens of focal length 24 cm. Find the image’s position and draw a ray diagram approximately to scale.
Saturday, August 2, 2014 at 5:33pm

physics
why the electric and magnetic fields are perpendicular to each other? why we need ampere circuital law when we already have bio sevarts law? why we use sin(theta) in the bio sevarts law why not the other ratios?
Saturday, August 2, 2014 at 5:09pm

College Physics 2
the Apollo 10 spacecraft traveled at 11 km/s just prior o its re-entry, setting a speed record for humans. Suppose advanced technology raises the speed record by a factor of 100, to 1100 km/s. if a time travel of 1 hour elapsed on a ground-based clock, by how many seconds ...
Saturday, August 2, 2014 at 4:01pm

College Physics 2
A broken-down spaceship (star Wreck?) flies across an international soccer field (Regulation length = 100 m) at a speed of 0.55c. A.) How long does the spaceship pilot measure the field to be? B.) From the spaceship pilot’s perspective, how long does it take to make this ...
Saturday, August 2, 2014 at 4:01pm

College Physics 2
An unstable particle called Bullroarium has a lifetime of 6x10E-10 seconds, measured at rest. If a Bullroariom particle zips past a stationary observer at 0.67c , find the stationary observer’s measurements for A.) Bullroarium lifetime as measured by the stationary ...
Saturday, August 2, 2014 at 4:01pm

physics
Can you please explain how to solve this question? Would I need to use the formula nλ=dsin(theta)? Red light with a wavelength of 660 nm and blue light with a wavelength of 480 nm are beamed at a double slit with a separation of 2x10^-3 mm. The third order maximums for ...
Saturday, August 2, 2014 at 2:19pm

Physics
A proton, traveling with a velocity of 6.8 × 106 m/s due east, experiences a magnetic force that has a maximum magnitude of 8.6 × 10-14 N and direction of due south. What are the magnitude and direction of the magnetic field causing the force? If the field is up, ...
Saturday, August 2, 2014 at 12:53pm

Physics
A projectile is launched at an angle of 30 to the horizontal with a speed of 30 m/s. How does the horizontal component of its velocity 1.0 s after launch compare with its horizontal component of velocity 2.0 s after launch?
Saturday, August 2, 2014 at 4:43am

Physics
A stone is thrown vertically upward with a speed of 18.0 m/s. (a)How fast is it moving when it reaches a height of 11.0 m? (b)How long is required to reach this height ? (c)Why are there two answers to (b)?
Saturday, August 2, 2014 at 4:35am

Physics
How long will it take the voltage across the capacitor in an RC circuit to discharge 75% of its initial charged voltage if the resistor has a resistance of 450 kilo-Ohms and the capacitor has a capacitance of 49 micro-farads? How do I solve this problem? Thanks!
Friday, August 1, 2014 at 11:52pm

Physics
Two identical capacitors are hooked in series to a 16.6 V emf. If the charge stored on any one of the capacitors is 0.88 micro-Coulombs after the capacitors are fully charged, what is the capacitance of either one of the capacitors?
Friday, August 1, 2014 at 11:51pm

physics
At exactly the critical angle: a) all light reflects back into the n1 medium b) all light reflects back into the n2 medium c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums d) part of the light reflects back...
Friday, August 1, 2014 at 2:08pm

Physics- check answer please
A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water Would the answer be a)?
Friday, August 1, 2014 at 2:08pm

physics
the speed of pendulum is under root 0.91 and time period 1.8 sec what will be its time period in initial frame of reference
Friday, August 1, 2014 at 1:33pm

physics
Using dimensions, show that 1 joule=107 sq erg.
Friday, August 1, 2014 at 12:41pm

physics
At exactly the critical angle: a) all light reflects back into the n1 medium b) all light reflects back into the n2 medium c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums d) part of the light reflects back...
Thursday, July 31, 2014 at 8:55pm

Physics- check answer please
Would the answer be b)? diamond into air? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water
Thursday, July 31, 2014 at 8:53pm

physics
The useful energy output of an engine is 1.50 × 103 kJ and the total mechanical energy input is 4.32 x 103 kJ . The efficiency of the engine is __________%
Thursday, July 31, 2014 at 7:47pm

physics
A 31.4-kg diver free falls from the diving board and hits the water with a speed of 10.0 m/s. Based on this information, the height of the tower is __________
Thursday, July 31, 2014 at 7:38pm

physics
A 45.0 g golf ball is released 2.50 m above the ground. The velocity of the golf ball when it hits the ground is
Thursday, July 31, 2014 at 7:38pm

physics
A sprinter has a mass of 82.0 kg. If the sprinter is running at a speed of 22.5 km/h, determine his kinetic energy. __________ × 103 J.
Thursday, July 31, 2014 at 7:36pm

physics
A 130.0 g object is moved from a shelf 0.2 m high to one that is 5.0 m high. The change in potential energy for the object is __________ .
Thursday, July 31, 2014 at 7:29pm

physics
A hockey player lifts a 600 g trophy up into the air a distance of 75.0 cm. The work done against gravity on the trophy is __________ J.
Thursday, July 31, 2014 at 7:28pm

physics
A car which is traveling at a velocity of 9.6 m/s undergoes an acceleration of 4.2 m/s2 over a distance of 450 m. How fast is it going after that acceleration?
Thursday, July 31, 2014 at 7:21pm

physics
When an object travelling at 12.7 m/s [E] speeds up to a velocity of 21.5 m/s [E] in 3.45 s, the magnitude of the acceleration is __________m/s2.
Thursday, July 31, 2014 at 7:18pm

physics
A male cheerleader does 2.25 kJ of work in lifting a 57.5 kg cheerleader 1.25 m off the ground during the half time show. The energy gained by the lifted cheerleader is __________ kJ.
Thursday, July 31, 2014 at 7:10pm

physics
The time required for a car to reach 28.5 m/s from rest, accelerating at 3.70 m/s2 is __________ .
Thursday, July 31, 2014 at 7:05pm

physics
An aircraft on its take-off run has a steady acceleration of 3.0 m/s2. It's velocity after 10 seconds will be
Thursday, July 31, 2014 at 7:02pm

physics
An athlete prepares for practice by walking 820 m in 10.3 min and sprinting 600 m in 3.8 min. Determine the athlete's average speed in metres per second.
Thursday, July 31, 2014 at 6:51pm

physics
A girl lifts her 20-kg knapsack a vertical distance of 0.70 m and then she carries it 2510 m across the park to the water fountain. The value of the work done by the girl is __________ J.
Thursday, July 31, 2014 at 6:09pm

physics
In a panic-stop, a car's brakes produced an acceleration of -8.0 m/s2 (or a deceleration of 8.0 m/s2). If you are traveling at 35 m/s, your speed after braking for 3.0 s will be
Thursday, July 31, 2014 at 5:57pm

physics
If you travel 10 m [E], 25 m [S], 12 m [W] and 25 m [N], your displacement is
Thursday, July 31, 2014 at 5:56pm

physics
A snail moved 0.14 m between two cabbages in 3.0 minutes. The average speed of the snail is
Thursday, July 31, 2014 at 5:55pm

physics
A bus traveled 10.0 km from the north end of the city to the south in 10.0 minutes. The average speed of the bus was
Thursday, July 31, 2014 at 5:54pm

physics
Written in scientific notation, with three significant digits, the number 0.01050 is_______?______ x 10?
Thursday, July 31, 2014 at 5:54pm

physics
Initial sources of energy used to operate machines were __________ and __________.
Thursday, July 31, 2014 at 5:36pm

physics
A machine loses 600 kJ as waste heat while producing 5,350 kJ of useful energy output. The efficiency of this machine is
Thursday, July 31, 2014 at 5:33pm

physics
Object A has mass m and velocity v. Object B has 18 times the mass and one third the velocity of object A. The kinetic energy of object B will be Spell check times the kinetic energy of object A.
Thursday, July 31, 2014 at 3:55pm

physics
A hockey puck with a mass of 0.200 kg travels with a speed of 49.6 m/s during a slap shot. The puck's kinetic energy is
Thursday, July 31, 2014 at 3:53pm

physics
Jill runs 100 m in 15.0 s. Jon speedwalks 100 m in 30.0 s. If Jill and Jon have the same mass, then Jill's kinetic energy would be
Thursday, July 31, 2014 at 3:52pm

physics
An elastic is stretched with an average force of 120.0 N a distance of 10.0 cm. The potential energy stored in the elastic is
Thursday, July 31, 2014 at 3:51pm

physics
A solid of mass 1kg suspended by a string is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid. (take g = 9.78m/s)
Thursday, July 31, 2014 at 3:44pm

physics
A 120.0 g object is moved from a shelf 2.9 m high to one that is 5.4 m high. The change in potential energy for the object is
Thursday, July 31, 2014 at 3:43pm

physics
Calculate the energy required to vapourise 50g of water Initially at 80¡ãC if the specific heat capacity of water is 4.2 J/g.k. (specific latent heat of vapourisation of water is 2260 J/g)
Thursday, July 31, 2014 at 3:37pm

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the answer be a?
Thursday, July 31, 2014 at 3:36pm

physics
How would I figure out the answer to this question? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into water
Thursday, July 31, 2014 at 3:35pm

Physics
Two trains, one starting in Calgary and the other in Edmonton, travel toward one another. The Edmonton train travels at 120 km/h toward Calgary, while the Calgary train travels at 140 km/h toward Edmonton. If the trains begin at the same time and Edmonton and Calgary are 285 ...
Thursday, July 31, 2014 at 3:27pm

physics
A string is wrapped around a uniform disk of mass M = 1.6 kg and radius R = 0.10 m. (Recall that the moment of inertia of a uniform disk is (1/2)MR2.) Attached to the disk are four low-mass rods of radius b = 0.17 m, each with a small mass m = 0.6 kg at the end. The device is ...
Thursday, July 31, 2014 at 9:34am

Science/Physics
Andee has a mass of 68.5 kg on earth. What is his weight on Earth? What should his mass be in order to have the same weight at the surface of the moon?
Thursday, July 31, 2014 at 7:23am

Physics
A plane travelling at a speed of 150 meter per second due east of north has to go from point A to point B 500 km apart. If a wind blows straight north at a speed of 20 meter per second find the angle the pilot should follow to reach point B and also the time taken in flying ...
Thursday, July 31, 2014 at 4:35am

Physics- check answer please
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the answer be a?
Wednesday, July 30, 2014 at 11:06pm

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above
Wednesday, July 30, 2014 at 5:15pm

College Physics 2
Find the resonant frequency of a circuit that has a 400 mH inductor and a 30 nF capacitor connected in series. A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. B) What would be the frequency of a station for ...
Wednesday, July 30, 2014 at 2:54pm

physics
A car travels 2.74 km in the x-direction, then turns left 61.2◦to the original direction and travels an additional distance of 3.19 km. Calculate the x component of the car’s net displacement.
Wednesday, July 30, 2014 at 12:53pm

PHYSICS
a wheel rotating at 1800 rpm slows down uniformly to 1200 rpm in 2.0 sec. calculate a)the angular acceleration (revs/s^2) of the motor. and b) the number of revolutions it makes in this time.
Wednesday, July 30, 2014 at 11:59am

PHYSICS
a flywheel makes300.rpm. find the angular speed of any point on the wheel and the linear speed(tangential) of a point 5.00m from the center.
Wednesday, July 30, 2014 at 11:57am

physics
a 60g golf ball leaves the face of the club with a velocity of 75m/s. if the club exerted an average force of 3.0x10to the 4th N, what was the time of impact between the club and the ball?
Wednesday, July 30, 2014 at 10:53am

physics
a 50kg box is pushed up a 30 degree plane which is 100m long. what is the speed of the box after being pushed the 100m? Mk=0.1
Wednesday, July 30, 2014 at 10:51am

Physics
The Angle of depression of Boat A from the top of a cliff which is 32 m high is 24 degree 15 minutes .The angle of depression of Boat B from the same point is 18 degree 12 minutes .Find distance between the two side with diagram
Wednesday, July 30, 2014 at 8:11am

physics
a solid copper sphere 10 mm in diameter has a positive charge arising from the removal of one electron from each 10^12 copper atoms. determine the net charge on the sphere, the electric field strength and electric potential at the surface.
Wednesday, July 30, 2014 at 2:58am

Physics
a 68kg skier is speeding down a ski slope that makes a 32 angle with the horizontal. The co-efficient of friction between the skies and the snow is 0.05. What is the acceleration of the skier? I want to understand how to do this
Wednesday, July 30, 2014 at 1:54am

Physics
A 3.0g bead has been threaded onto a vertical, frictionless, circular hoop with a 20cm radius. The bead is released from rest at 25º below the vertical. (a) Find the speed of the bead when it is 70° below the vertical. (b) Using the free-body diagram technique, find ...
Wednesday, July 30, 2014 at 12:36am

physics
A small rock passes a massive star, following the path shown in red on the diagram above. When the rock is a distance 4e+13 m (indicated as d1 on the diagram) from the center of the star, the magnitude of its momentum p1 is 1.1e+17 kg ·m/s, and the angle α is 116 ...
Tuesday, July 29, 2014 at 8:45pm

physics
A 900kg car strikes a huge spring at a speed of 22m/s, compressing the spring 4.0m How long is the car in contact with the spring before it bounces off in the opposite direction? I found the spring constant to be 27225, which i know is right, but am having trouble with this ...
Tuesday, July 29, 2014 at 4:27pm

physics
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above
Tuesday, July 29, 2014 at 2:20pm

Physics
Why should a voltmeter have a hisg resistance? How should a voltmeter be connected to the componenets of which the voltage is being measured.
Tuesday, July 29, 2014 at 2:17pm

Physics -- check answer please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
Tuesday, July 29, 2014 at 1:50pm

PHYSICS
WHAT DOES A DISPLACEMENT-TIME BALLON GRAPH REPRESENTS?
Tuesday, July 29, 2014 at 7:58am

Physics
The maximum torque output from the engine of a new experimental car of mass m is τ. The maximum rotational speed of the engine is ω. The engine is designed to provide a constant power output P. The engine is connected to the wheels via a perfect transmission that can...
Monday, July 28, 2014 at 11:02pm

Physics -- check answers please
Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
Monday, July 28, 2014 at 10:23pm

physics
1. If the period of a wave is 0.27s, how many waves would pass by in 1.0 minute? 2. When a wave from of light passes through an opening that's large compared to its wavelength, it: a) behaves as a single new point source b) produces a straight wave front, curved backwards ...
Monday, July 28, 2014 at 9:44pm

Physics -- check answer please
Refraction is: a) the way light behaves when it goes through a narrow opening b)the way teo light sources interact to produce interference patterns c) the absorption of one component of the electric field d) none of the above are correct my answer: d
Monday, July 28, 2014 at 9:42pm

PHYSICS
You are driving your car and the traffic light ahead turns red. You applied the brake for 3.00 seconds and the velocity of the car decreases to 4.50 m/s. The car's deceleration has a magnitude of 2.70 m/s^2 during this time. What is the car's displacement?
Monday, July 28, 2014 at 9:34pm

College Physics 2
A) Canadian FM radio station (CLAW) broadcasts lobster information at 95.9 MHz. find the wavelength of this station. (B) What would be the frequency of a station for which the carrier wave was 400 m long?
Monday, July 28, 2014 at 7:12pm

Physics -- check answers please
1. If 31 waves pass by a point in 1.7 s, what's the frequency? my answer: 18.2 Hz 2. if a crest with an amplitude of 7cm interferes with a trough with an amplitude of 10 cm, the resulting wave has an amplitude of: my answer: -3
Monday, July 28, 2014 at 6:04pm

Physics 2
In order of increasing frequency, list the waves that make up the electromagnetic spectrum and give an example of each type of wave. Explain how Snell’s law describes refraction.
Monday, July 28, 2014 at 5:22pm

Physics 2
Explain briefly the workings of electrical transformer, both step-up and step-down In a step-up transformer, compare the secondary voltage and current to the corresponding primary values. Explain briefly how transformers minimize losses in long distance electrical circuits. ...
Monday, July 28, 2014 at 5:21pm

Physics 2
State Lenz’s law and explain Briefly explain the operation of an electric generator
Monday, July 28, 2014 at 5:20pm

Physics 2
List and explain briefly five magnetic devices found in the popular culture Are stationary charges affected be a magnetic field? What determines the direction of the magnetic force on a moving charge? What is the cause of all magnetic fields?
Monday, July 28, 2014 at 5:20pm

Physics 2
A 60 cm long wire is oriented from east to west directly above the equator and carries a current of 5 A (toward the east). What is the magnitude and direction of the magnetic force on this wire due to the earth’s magnetic field (30 µT oriented south and north)?
Monday, July 28, 2014 at 5:14pm

Physics 2
what magnetic force would an electron experience due to Earth’s magnetic field if it were moving at 3x10E6 m/s directly away from earth’s surface? (Earth’s B-field in the region is parallel to the surface and has a strength of 550 µT)
Monday, July 28, 2014 at 5:13pm

Physics 2
A 42 mT magnetic field points due west. If a proton of kinetic energy 9x10E-12 J enters this field in an upward direction, find the magnetic force acting on the proton in magnitude and direction.
Monday, July 28, 2014 at 5:13pm

physics
An object carries a charge of -6.9 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the same charge?
Monday, July 28, 2014 at 3:32pm

physics
Two spherical objects are separated by a distance of 1.53 × 10-3 m. The objects are initially electrically neutral and are very small compared to the distance between them. Each object acquires the same negative charge due to the addition of electrons. As a result, each ...
Monday, July 28, 2014 at 2:19pm

physics
A proton moves parallel to an electric field between points A and B. The change in the proton's electric potential energy is EPEB – EPEA. If the proton is removed from point B and replaced with an electron, how does the change in electric potential energy of the ...
Monday, July 28, 2014 at 2:04pm

Physics
Two objects separated by a distance r are each carrying a charge –q. The magnitude of the force exerted on the second object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the magnitude of the ...
Monday, July 28, 2014 at 1:39pm

physics
a car is moving foward at 15.7m/s. a person in the bus throws a ball horizontally toward the front of the car at 17.5 m/s from your perspective as an observer outside the car the tennis ball appears to moving at what velocity?
Monday, July 28, 2014 at 9:58am

physics
a jeepney of a mass 1500kg is travelling at a speed of 20m/s (about 70km/h) a. what is the kinetic energy of the jeepney? b.suppose the driver suddenly steps on the brakes. if the force is 7500 newtons, what will be the distance traveled by the jeepney before it stops?
Monday, July 28, 2014 at 7:00am

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