Monday

July 28, 2014

July 28, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A man throws a ball to a maximum distance of 80m.how long is it in the air and to what height does it rise? Nehlect the height of the man
*Friday, July 18, 2014 at 4:54am*

**Physics**

An object of mass 0.5 kg is whirled at the end of a string 0.8 m long.If the string makes three revolution in 1.2 s,find the tension in the string.
*Friday, July 18, 2014 at 3:58am*

**physics**

How much heat must be added to 128.7 g of ice at 0 degrees Celsius to melt the ice completely? Answer = _____calories
*Thursday, July 17, 2014 at 9:35pm*

**physics**

How much heat must be added to 128.7 g of ice at 0 degrees Celsius to melt the ice completely? Answer = _____calories
*Thursday, July 17, 2014 at 9:31pm*

**physics**

A single circular loop of wire of radius r = 2.5cm rotates at a frequency of 60 Hz in a constant magnetic field of magnitude B = 1.8 T. Use this to design a generator that produces an induced emf of 430 V. Hint: You must choose values for the number of loops and the area of ...
*Thursday, July 17, 2014 at 8:55pm*

**physics**

A man shoots a rifle at a height of 1.7 m above level ground. His aim is perfectly horizontal. At the same time the bullet leaves the barrel of the gun at 670 m/s, the shell casing is ejected with a velocity of 3 m/s, also perfectly horizontal to the ground (but at an angle of...
*Thursday, July 17, 2014 at 3:24pm*

**Physics**

A 2.0 kg ball moving with a speed of 3.0 m/s hits, elastically, an identical stationary ball as shown. If the first ball moves away with angle 30° to the original path, determine a)the speed of the first ball after the collision. b)the speed and direction of the second ...
*Thursday, July 17, 2014 at 2:15pm*

**physics**

A standing wave has X nodes in a string Y m long The wavelength of this wave is ___ m rounded to the first decimal place.
*Thursday, July 17, 2014 at 11:06am*

**Physics**

The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees are there between the melting point and the boiling point? 20 degrees Celsius 70 degrees Celsius 90 degrees Celsius 110 degrees Celsius
*Thursday, July 17, 2014 at 9:45am*

**Physics**

A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900 kJ/kg*C, and the ...
*Thursday, July 17, 2014 at 9:43am*

**physics**

A lift starts from the top of a mine shaft and descends with a constant speed of 10 m/s. 4 s later a boy throws a stone vertically upwards from the top of the shaft with a speed of 30 m/s. Find when and where stone hits the lift [take: g=10 m/s²]
*Thursday, July 17, 2014 at 4:38am*

**physics**

A body starts with an initial velocity of 10m/s and moves along a straight line with a constant acceleration. When the velocity of the particle becomes 50 m/s the acceleration is reversed in direction without changing magnitude. Find the velocity of the particle when it ...
*Thursday, July 17, 2014 at 4:32am*

**physics 2**

find the speed of proton 0.08m,mass of proton is 1.67x10^-27 kg
*Wednesday, July 16, 2014 at 5:04am*

**physics**

A power station with an efficiency of 0.35 generates 10^8 W of electric power and dissipates 1.86 ✕ 10^8 W of thermal energy to the cooling water that flows through it. Knowing the specific heat of water in SI units is 4184 J/kg°C, calculate how many kilograms of ...
*Wednesday, July 16, 2014 at 5:03am*

**physics**

Determine the banking angle needed to make a high-speed turn off a highway exit ramp with a radius of 720 m if the vehicle is travelling at 80 km/h. Assume there is no friction.
*Wednesday, July 16, 2014 at 2:13am*

**Physics mit 2.01x**

F13Q1_1: COMPOSITE BAR UNDER DISTRIBUTED LOADING The composite bar AB has length L and is fixed at A(x=0). The bar has a constant cross-section and is composed of two steel plates, of modulus Es=2E0 sandwiching a copper core of modulus Ec=E0. The steel plates and the copper ...
*Tuesday, July 15, 2014 at 12:04pm*

**physics**

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...
*Tuesday, July 15, 2014 at 11:51am*

**physics**

A charge with a value of 3.0 x 10^-5 C is located 3.0 cm from a charge with a value of 6.0 x 10^-5 C. Determine the distance from the larger charge to the point where the total electric field is zero
*Tuesday, July 15, 2014 at 11:51am*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.191 m) sin (0.745 x - 42.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 11.7 g/m ... a) ... determine the phase constant. b) ... the phase of the wave at x = 2...
*Tuesday, July 15, 2014 at 11:15am*

**physics**

A toy plane p starts flying from point A along a straight horizontal line 20 m above ground level starting with zero initial velocity and acceleration 2 m /s² as shown. At the same instant, a man P throws a ball vertically upwards with initial velocitu 'u'. Ball ...
*Tuesday, July 15, 2014 at 10:44am*

**physics**

Mrs bautista accelerates her bicycle uniformly along a straight path from 10.5 m/s to rest in 5.2s. A. What is her acceleration? B. What is her displacement during this time interval?
*Tuesday, July 15, 2014 at 9:49am*

**physics**

If Zulfiqar fold this colored paper as shown in the image, which cube will he get? A C B D
*Tuesday, July 15, 2014 at 8:46am*

**physics**

An 800 kg police boat slows down uniformly from 50 km/h [E] to 20 km/h [E] as it enters a harbour. If the boat slows down over a 30 m distance, what is the force of friction on the boat? (Hint: You will need to convert the velocities into m/s.)
*Tuesday, July 15, 2014 at 3:09am*

**physics**

There is a typo in this question. Ignore the ”cdot” in the units for G. A satellite is in a circular orbit just above the surface of the Moon. What is the satellite’s acceleration? The value of gravitational constant is 6.67259 × 10−11 Ncdotm2/kg2 ...
*Monday, July 14, 2014 at 6:28pm*

**physics**

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...
*Monday, July 14, 2014 at 4:06pm*

**physics**

A tank has a length of 0.18 m, a width of 0.78 m, and a height of 0.44 m. If it is filled with water, how many kilograms does it weigh?
*Monday, July 14, 2014 at 1:54pm*

**physics**

A tank has a length of 0.18 m, a width of 0.78 m, and a height of 0.44 m. If it is filled with water, how many kilograms does it weigh?
*Monday, July 14, 2014 at 1:54pm*

**Physics help**

A charge with a value of 3.0 x 10^-5 C is located 3.0 cm from a charge with a value of 6.0 x 10^-5 C. Determine the distance from the larger charge to the point where the total electric field is zero
*Monday, July 14, 2014 at 12:08pm*

**Physics help**

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...
*Monday, July 14, 2014 at 12:07pm*

**physics**

2.Boxcar A, with a mass of 1500 kg, is travelling at 25 m/s to the east. Boxcar B has a mass of 2000 kg and is initially at rest. The boxcars collide inelastically and move together after they get stuck. What is their combined velocity?
*Monday, July 14, 2014 at 11:25am*

**physics**

You walk to the corner store after school to buy a carton of milk before going home. The store is 750 m south of the school, and your house is 625 m north of the school. What distance have you travelled since leaving the school?
*Monday, July 14, 2014 at 10:58am*

**physics**

A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
*Monday, July 14, 2014 at 9:36am*

**PHYSICS MAT**

A 1.2 kg object moving at initial velocity 2.0m/s collides elastically with a stationary 0.5kg object horizontally. Calculate A) the velocity of each object after the collision. B) the impulsive force if the contact time is 0.3 s.
*Monday, July 14, 2014 at 9:22am*

**PHYSICS MAT**

A bullet of mass 5 g with velocity 1000m/s hits a wooden block of 1.5kg at rest vertically. If the bullet penetrates through the block with a velocity of 400m/s, calculate the maximum height in which the block is lifted from its initial position.
*Monday, July 14, 2014 at 9:07am*

**Physics **

A bullet of mass 5 g with velocity 1000m/s hits a wooden block of 1.5kg at rest. If the bullet penetrates through the block with a velocity of 400m/s, calculate the maximum height in which the block is lifted from its initial position.
*Monday, July 14, 2014 at 9:00am*

**physics**

A string with linear mass density μ = 0.0279 kg/m under a tension of T = 183 N is oriented in the x-direction. Two transverse waves of equal amplitude and with a phase angle of zero (at t = 0) but with different frequencies (ω = 3420 rad/s and ω/3 = 1140 rad/s) ...
*Monday, July 14, 2014 at 5:45am*

**Physics**

how much does a 2 lietr bottle of soda pop weigh in pounds? assume that the pop has the density ofg water,namely 1 kg\lietr and that the weight of the bottle itself is negligible?
*Monday, July 14, 2014 at 4:11am*

**physics**

A string with linear mass density μ = 0.0279 kg/m under a tension of T = 183 N is oriented in the x-direction. Two transverse waves of equal amplitude and with a phase angle of zero (at t = 0) but with different frequencies (ω = 3420 rad/s and ω/3 = 1140 rad/s) ...
*Sunday, July 13, 2014 at 7:31pm*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.191 m) sin (0.745 x - 42.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 11.7 g/m ... a) ... determine the phase constant. b) ... the phase of the wave at x = 2...
*Sunday, July 13, 2014 at 7:14pm*

**physics**

A charge with a value of 3.0 x 10^-5 C is located 3.0 cm from a charge with a value of 6.0 x 10^-5 C. Determine the distance from the larger charge to the point where the total electric field is zero
*Sunday, July 13, 2014 at 7:07pm*

**physics**

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...
*Sunday, July 13, 2014 at 6:50pm*

**physics**

A 1000 kg rocket without an internal propulsion system is launched with an initial speed of 7.00 x 10^2 m/s. Determine the maximum height attained by the rocket
*Sunday, July 13, 2014 at 6:37pm*

**Physics**

Two blocks of masses m1 = 4.4 kg and m2 = 4.8 kg are connected by a string as shown in the figure above. Block 1 moves at a constant velocity down the incline 30 degrees) block two is not at incline it is straight. they are attached with a string. a) Find the coefficient of ...
*Sunday, July 13, 2014 at 6:07pm*

**Physics**

Two blocks of masses m1 = 4.4 kg and m2 = 4.8 kg are connected by a string as shown in the figure above. Block 1 moves at a constant velocity down the incline 30 degrees) block two is not at incline it is straight. they are attached with a string. a) Find the coefficient of ...
*Sunday, July 13, 2014 at 5:52pm*

**Physics**

1 g/cm^3 = _________ kg/m^3 I tried converting g to kg and then cm to m, and then dividing. I get the answer 1x10^(-1). When I type in this problem on the internet, many sources say it is 1000. I am very confused as to how this answer was reached.
*Sunday, July 13, 2014 at 1:39pm*

**physics **

an object is 25 cm from a concave mirror whose focal length is 50 cm where will the image be located how wil lthe solution be ?
*Sunday, July 13, 2014 at 8:41am*

**physics**

A cannon is shooting emergency packets to people stranded on the roof of a flooded building of height H = 104 meters relative to the cannon, the corner of which is located a distance D = 53 meters from the cannon. It is desired that the incoming packets are flying tangent to ...
*Sunday, July 13, 2014 at 7:43am*

**Physics**

if the mass of two balls is 0.300 kg each then what is the gravitational force between them if the distance is 0.3000 m
*Sunday, July 13, 2014 at 6:09am*

**physics**

A standard CD has a diameter of 12.0 cm, and a hole that is centered on the axis of symmetry and has a diameter of 1.50 cm. The CD’s thickness is 1.2 mm, and it's mass is 17 g. If a (very thin) pin extending through the hole of the CD suspends it in a vertical ...
*Saturday, July 12, 2014 at 8:32pm*

**physics**

1. which of the following is not true about magnetic field lines a) mag. field lines flow from North to South inside the magnet b) mag. field lines do not cross c) mag. field line density is proportional to field strength d) mag. field is strongest closest to the ends of a bar...
*Saturday, July 12, 2014 at 8:17pm*

**physics**

Would the answer be c? The electrical potential 10 cm from an electron is: a) 1.4x10^-8 V b) 1.4x10^-10 V c) 1.4x10^-7 V d) 1.2x10^-4 V
*Saturday, July 12, 2014 at 8:08pm*

**physics**

Would the answer be a? Which two forces balanced in the Millikan oil drop experiment a) electric and gravitational b) electric and magnetic c) magnetic and gravitational d) none of the above
*Saturday, July 12, 2014 at 7:46pm*

**physics**

The escape velocity on the moon is: a) 5.64x10^6 m/s b) 1.68x10^3 c) 160 m/s d) 2.38x10^3 m/s
*Saturday, July 12, 2014 at 7:16pm*

**physics**

If the electric field near a proton is 9.00 x 10^-3 N/C, what is the distance from the proton?
*Saturday, July 12, 2014 at 6:58pm*

**PHYSICS**

a ball is dropped from rest at 25m above the ground. how fast is it moving at 10 m above the ground and b) how much time does it take to reach the ground? no air resistance.
*Saturday, July 12, 2014 at 3:37pm*

**physics**

Background knowledge: For cars traveling along dufferin,the speed is 60km/h. The distance to cross the intersection is 34m. Assume the length of a typical car is 4.5m. For safety reasons, the Ministry of Transportation recommends that vehicles stop with an acceleration no ...
*Saturday, July 12, 2014 at 1:06pm*

**PHYSICS**

a swimmer develops an average of 200 watts in a distance of 100m in 80 seconds. what is the force resistance in the water?
*Saturday, July 12, 2014 at 11:11am*

**Physics**

A staging that weighs 140 N support two painters, one 500 N and the other 520 N. The reading in the left scale is fl = 740 N. what is the reading Fr in the right hand scale
*Friday, July 11, 2014 at 7:51pm*

**Physics**

I push a stack of six books (each weighting 4 kg) horizontally across a table to the right with a kinetic coefficient of friction uk = 0.5. I apply a force of 120 N. a) What is the acceleration of the books? b) what is the force of the rightmost book on its neighbor? Next, I ...
*Friday, July 11, 2014 at 3:35pm*

**physics**

With brakes fully applied, a 1370 kg car deccelerates from a speed of 98.0 km/hr. What is the work done by the braking force in bringing the car to a stop?
*Friday, July 11, 2014 at 12:11pm*

**physics**

A force of 1.57 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?
*Friday, July 11, 2014 at 12:05pm*

**physics**

if A cross B =B cross A, then the angle between them is
*Friday, July 11, 2014 at 10:24am*

**PHYSICS**

V= pie r^2h r=4.38m V= 368m^3 h=?
*Friday, July 11, 2014 at 8:15am*

**PHYSICS**

m1(x)=m2(3-x) (for x)
*Friday, July 11, 2014 at 8:13am*

**PHYSICS**

m1v1+m2v2=m1vf+m2vf solve for (vf)
*Friday, July 11, 2014 at 8:12am*

**PHYSICS**

a 100kg street light is supported equally by two ropes. one rope pulls up and to the right 40 degrees above the horizontal; the other pulls up and to the left 40 degrees . what is the tension of the rope?
*Friday, July 11, 2014 at 8:03am*

**PHYSICS**

a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
*Friday, July 11, 2014 at 7:43am*

**PHYSICS**

a sled weighing 5.00 x 10to the third power can be accelerated from rest to 1.60 x 10 to the third km/hr in 2 seconds. muse of k =0.21. what force is required and how far did the sled go during acceleration?
*Friday, July 11, 2014 at 7:39am*

**PHYSICS**

a mass of 2.00kg is pushed up a 50 degree incline. if muse of k is 0.400 and a force of 50.0 N is applied parallel to the plane, what is the acceleration of the mass?
*Friday, July 11, 2014 at 7:36am*

**PHYSICS**

what is the kinetic energy of a 20.0g bullet moving with a speed of 150m/s? how much work is needed to stop the bullet?
*Friday, July 11, 2014 at 7:20am*

**PHYSICS**

from a height of 1.5m a 2.0kg block slides down an incline which is 2.5m long and out onto the level floor. how far does it slide horizontally? muse of k is 0.32
*Friday, July 11, 2014 at 7:18am*

**PHYSICS**

the speed of a bowling ball is 2.0m/s as it falls past a window of a tall building. using conservation of energy ,determine how fast it was going as it past another window 3.0m below.
*Friday, July 11, 2014 at 7:16am*

**PHYSICS**

determine the speed of a 2.0g insect that has kinetic energy of 0.020 J.
*Friday, July 11, 2014 at 7:14am*

**Physics**

all electric field lines start on positive charges. explain why this makes sense.
*Thursday, July 10, 2014 at 11:08pm*

**Physics**

Actually, I have 3 questions to solve. I know the 1st one requires Coulomb's constant, but I just can't get the formula to work. Ditto for the formulas for the other 2 questions. 1) A 6.3 μC point charge and a −1.7 μC point charge are separated by a ...
*Thursday, July 10, 2014 at 10:35pm*

**physics**

Mufaddal wants to travel from point H to point F as shown in image. How many ways can he travel from point H to point F if moving north and west directions are not permitted? 12 10 4 7
*Thursday, July 10, 2014 at 7:46pm*

**Physics**

A proton with mass 1.67×10−27 kg and charge 1.60×10−19 C accelerates from rest in a uniform electric field of strength 500 N/C. (a) What is the magnitude of the acceleration of the proton? (b) How long does it take the proton to reach a speed of 35,000 ...
*Thursday, July 10, 2014 at 3:30pm*

**physics**

What is a charge dipole a basic model of? would it be a magnet?
*Thursday, July 10, 2014 at 2:58pm*

**Physics- help please**

A beta particle (fast moving electron) is released by a nuclear decay and starts travelling at 1.5x10^6 m/s [NΘE] in the Earth's magnetic field which has a value of 3.0x10^-5 T. If the force experienced by the beta particle is 4.34x10^-18 N, determine the angle ...
*Thursday, July 10, 2014 at 11:03am*

**Physics**

An automobile moving at a constant velocity of 25m/s passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 4.0m/s^2. how soon will the second automobile overtake the first?
*Thursday, July 10, 2014 at 10:09am*

**Physics**

A boat is moving 24.4m/s, 35 degrees North of East against the 10m/s water current that flows towards south. What would be the speed of the boat as it crosses the river
*Thursday, July 10, 2014 at 8:56am*

**physics**

what would tension 1 be if W1=15N ,W2=20N and W3=150N, and Muse of k = 0.65?
*Thursday, July 10, 2014 at 7:20am*

**physics**

d. You’ve designed one of the ranks of pipes within the organ using a metal alloy consisting of a mixture of tin and copper. The customer decides (at the last minute) that they like the sound of stainless steel pipes for these ranks better. How do you anticipate this ...
*Thursday, July 10, 2014 at 4:29am*

**physics**

3moves i think so ?
*Thursday, July 10, 2014 at 12:52am*

**physics**

if the component of A along B is same as that of component of B along A then angle between A and B is
*Thursday, July 10, 2014 at 12:19am*

**physics**

Burhan arranged eight wooden sticks in the shape of a fish as shown in the image. What is the minimum number of sticks that must be moved to make the fish face the opposite direction? 2 moves 3 moves 5 moves 4 moves
*Thursday, July 10, 2014 at 12:01am*

**Physics**

Two parallel wires are carrying current. If the currents are in the same direction, what is the interaction between the two wires and why? How would this be different in the currents were in opposite directions?
*Wednesday, July 9, 2014 at 11:10pm*

**Physics help**

1. if the magnetic field is 2.1 m from a current carrying wire is 7.1x10^-5 T, what is the current flowing through the wire? 2. The electromagnet in an MRI has a magnetic field of 2.5 T. If there are 100 A of current running through the magnet, how many turns are there in a 1....
*Wednesday, July 9, 2014 at 7:59pm*

**Physics**

A baseball is thrown with a speed of 40m/s at an angle of 30 degrees. Neglecting friction what is the speed of the ball in m/s when it reaches a height of 10 meters?
*Wednesday, July 9, 2014 at 12:14pm*

**Physics**

A motor outputs power of 500 watts and is used to raise a 5kg mass vertically at constant speed. How long in seconds does it take to raise the mass 15 meters?
*Wednesday, July 9, 2014 at 11:55am*

**Physics**

For a 0.1-kg frog to jump to a height of 80cm requires how much energy in joules? A) 0.566 Joule. B) 0.784 Joule. C) 0.584 Joule. D) 0.287 Joule. Not sure what I am missing... PE=mgh (0.1)(9.8)(80)= 78.4
*Wednesday, July 9, 2014 at 11:24am*

**physics**

if theta is the angle between unit vectors A bar and B bar, then (1-A bar.B bar)/(1 plus A bar.B bar) is equal to
*Wednesday, July 9, 2014 at 9:55am*

**physics**

a man of 80kg is supported by a two cables then t1 and t2 is
*Wednesday, July 9, 2014 at 9:52am*

**PHYSICS**

what would tension 1 be if W1=15N ,W2=20N and W3=150N, and Muse of k = 0.65?
*Wednesday, July 9, 2014 at 9:36am*

**physics**

a car travel 100 km at speed of 60 km /h. Calculate the average speed of the journey.
*Wednesday, July 9, 2014 at 8:50am*

**physics**

A ball of mass m is projected with a speed u at an angle theta with horizontol. Find the change in momentum after time t and when it reaches the ground
*Wednesday, July 9, 2014 at 5:43am*

**physics**

The net external force on a cart is N north. If the cart has a total mass of 220 kg, What are the magnitude and direction of its acceleration?
*Wednesday, July 9, 2014 at 4:29am*

**physics**

A person whose mass is m = 100.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 32.7° with the horizontal. What is the reading on the scale?
*Wednesday, July 9, 2014 at 2:20am*

**physics**

A certain transverse wave is described by the equation y(x,t) = (6.50 mm)sin2pi((t/0.0360 s)-(x/0.280m)) Determine the wave's (a) amplitude (b) wavelength (c) frequency (d) speed of propagation and (e) direction of propagation
*Wednesday, July 9, 2014 at 1:59am*

**Basic Physics**

I don't understand how to work this problem out: Find x-component of vector a ⃗ = (7.0m/s 2 , - y-direction) Please help
*Wednesday, July 9, 2014 at 1:18am*

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