Friday
August 22, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
a ball of mass 5kg is dropped from a height of 78.4m,the time taken by the ball to reach the ground is?
Wednesday, August 6, 2014 at 3:23am

physics
why is the surface of a bell made large?
Tuesday, August 5, 2014 at 10:21pm

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?
Tuesday, August 5, 2014 at 8:58pm

physics
the mass of the water is 131 kg and its initial temperature is 24.2°C, how much energy must the water transfer to its surroundings in order to freeze completely? The specific heat of water is 4186 J/kg·K, and the latent heat of fusion is 333 kJ/kg
Tuesday, August 5, 2014 at 7:39pm

physics
As it passes over Grand Bahama Island, the eye of a hurricane is moving in a direction 25.0° north of east with a speed of 40.6 km/h. Three hours later, the course of the hurricane suddenly shifts due north, and its speed slows to 23.0 km/h. How far from Grand Bahama is ...
Tuesday, August 5, 2014 at 5:43pm

Physics
A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground
Tuesday, August 5, 2014 at 5:34pm

physics
The rate of burning of fuel in a rocket is 50 g/sec and comes out with a velocity 4X1000 sec. then find the force extended by fuel on the rocket.
Tuesday, August 5, 2014 at 10:09am

college physics
Calculate the angular speed of the moon if it makes a revolution around the earth in 27.3 days?
Tuesday, August 5, 2014 at 4:07am

college physics
A wheel starts from rest and increase it's rotational speed;time required to reach that speed;Uniform angular acceleration.
Tuesday, August 5, 2014 at 4:06am

college physics
What is the force applied in the direction of the wire at a point attached to the patient in a traction system, if the mass applied is equal to 5kg?
Tuesday, August 5, 2014 at 4:04am

Physics
Why can you exert a greater force on the pedals of a bike if you pull up on the handlebars? Does it have anything to do with one of Newton's 3 laws? I'm not sure how to approach this question.
Monday, August 4, 2014 at 7:55pm

physics
calculate the amount of heat energy required to melt a 1kg iron ingot initially at 20 ¡ãC? (heat of fusion for Fe is 33.0 J/g
Monday, August 4, 2014 at 7:44pm

physics
A projectile is fired with an initial speed of 65.2 m/s at an angle of 34.5 degree above the horizontal on a long flat firing range. Determine (a) The maximum height reached by the projectile, (b) The total time in the air, (c) The total horizontal distance covered (that is, ...
Monday, August 4, 2014 at 7:37pm

physics
100 grams of a liquid with a temp of 70 degreess celcius and a specific heat of 4 J/K/gram is poured into an aluminum pan having a mass of 4000 grams and an initial temp of 20 degrees. with a specific heat capacity of 0.9. what is the final temp of teh liquid in the pan after ...
Monday, August 4, 2014 at 3:33pm

physics
An astronaut in a spaceship is listening to his music. Calculate the time it takes to play a 4.00 minute song at 0.1c
Monday, August 4, 2014 at 2:25pm

science (physics)
A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path
Monday, August 4, 2014 at 12:50pm

science (physics)
A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path
Monday, August 4, 2014 at 11:33am

Physics
The rate of volume flow of water through a canal is found to be a function of cross -section of canal and velocity of water.show that the rate of volume flow is proportional to the velocity of flow of water
Monday, August 4, 2014 at 10:59am

Physics-help please!
A wave on a rope is 6.1m . a.) What is the wavelength of this wave? b.) If the frequency of the wave is 6.2Hz, what is the wave velocity?
Monday, August 4, 2014 at 10:15am

PHYSICS
THE MASS OF VENUS IS 81.5% OF THE EARTH AND ITS RADIUS IS 94.9% THAT OF THE EARTH. A)COMPUTE THE ACCELERATION DUE TO GRAVITY ON THE SURFACE OF VENUS FROM THESE DATA.B)IF A ROCK WEIGHS 75.0N ON EARTH,WHAT WOULD IT WEIGH ON THE SURFACE OF VENUS?
Monday, August 4, 2014 at 9:08am

PHYSICS
AT WHAT DISTANCE ABOVE THE SURFACE OF THE EARTH IS THE ACCELERATION DUE TO EARTH'S GRAVITY 0.980M/S² IF THE ACCELERATION DUE TO GRAVITY AT THE SURFACE HAS MAGNITUDE 9.80M/S²
Monday, August 4, 2014 at 8:46am

physics-please help
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, ...
Monday, August 4, 2014 at 7:18am

physics
Compare the work that a 22-kW car engine does in 60 seconds if its efficiency changes from 100% to 75%.
Monday, August 4, 2014 at 5:59am

physics
(a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 78.0 km/h? m (b) If, in actuality, a 750 kg car with an initial speed of 78.0 km/h is observed to coast up a hill to a height 12.0 m above its starting point, how much...
Monday, August 4, 2014 at 4:59am

physics
I need help with this question. Would you be able to explain it please? Double slit interference patterns exhibit mλ path difference for constructive interference. Single slit diffraction patterns exhibit (m+1/2)λ path difference for constructive interference. With ...
Monday, August 4, 2014 at 1:06am

Science (Physics)
Two resistors 3ohms and 6ohms are connected in parallel across a 6V battery, what is the current flow through the 3ohms resistors? Just the formula please.
Sunday, August 3, 2014 at 10:37pm

Physics
If a bulb of 5ohms is connected across a 12V battery, what is the current flow through the bulb? The formula for this problem would be great, I can solve it from there.
Sunday, August 3, 2014 at 10:30pm

Physics
Two resistors 10ohms and 5ohms are connected in parallel across a 15V battery. What is the potential difference across the 10ohms resistor. I do not need the answer just the formula and how to figure out the problem. Thanks.
Sunday, August 3, 2014 at 10:28pm

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

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