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October 1, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

Physics
In regards to Period of a Mass on a Spring, If the amplitude of the oscillation is increased, would the oscillation period be unchanged? Is so, is it because the oscillator's period is determined only by the stiffness of the spring and the mass of the block?
Wednesday, July 9, 2014 at 12:26am

Physics
A student is skateboarding down a ramp that is 8.33 m long and inclined at 24.5° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 4.12 m/s. Neglect friction and find the speed at the bottom of the ramp.
Tuesday, July 8, 2014 at 10:17pm

Physics
a student pushes on a desk with a force of 75 N causing it to begin sliding. if the desk weighs 400 N then calculate the coefficient of static friction between the desk and the floor
Tuesday, July 8, 2014 at 10:04pm

Physics
Car A travels with speed v around curve number one, which has a radius r. Car B travels with speed 2v around curve number two, which has a radius 2r. What is the ratio of the two accelerations A/B? A) 2 B) 4 C) 1/2 D) 1/4 E) 1
Tuesday, July 8, 2014 at 8:59pm

Physics
15. A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m above the ground. When pushed up a slanting ramp 2.0 m in length a force parallel to the ramp of only 800 N is required to move it at constant velocity. Comparing the work involved in lifting the...
Tuesday, July 8, 2014 at 8:58pm

Physics
A car traveling with an initial velocity of 15.5 m/s accelerates at a constant rate of 3.0 m/s2 for a time of 3.6 seconds. (a) What is its velocity at the end of this time? A) 26.3 m/s B) 18.5 m/s C) 10.8 m/s D) 22.1 m/s E) 19.1 m/s
Tuesday, July 8, 2014 at 8:58pm

Physics
A bullet is fired horizontally from a height of 4.9 m with a velocity of 680 m/s. How far away does the bullet land? A) 680 m B) 340 m C) 1360 m D) 170 m E) 800 m
Tuesday, July 8, 2014 at 8:57pm

Physics
Car A travels with speed v around curve number one, which has a radius r. Car B travels with speed 2v around curve number two, which has a radius 2r. What is the ratio of the two accelerations A/B? A) 2 B) 4 C) 1/2 D) 1/4 E) 1
Tuesday, July 8, 2014 at 8:56pm

Physics
Your mass is 50 kg. Suppose you are standing on a scale in an elevator which starts moving up and increases its speed at the rate of 2 m/s every second. What would be the reading on the scale? A) 590 N B) 490 N C) 390 N D) 100 N E) 0
Tuesday, July 8, 2014 at 8:53pm

Physics
A ball is thrown as a projectile with a horizontal velocity of 30 m/s and a vertical velocity of 30 m/s. At the highest point which of the following is true? A) The velocity is zero B) The acceleration is 0 C) The acceleration is 9.8 m/s2 D) The acceleration is -9.8 m/s2 E) ...
Tuesday, July 8, 2014 at 8:51pm

Physics
A stone is thrown upward from a bridge at a speed of 10 m/s. It narrowly misses the bridge on the way back down, and hits the water at 30m/s. what is the approximate height of the bridge?
Tuesday, July 8, 2014 at 7:54pm

physics
Regarding "Period of Mass on a Spring", What will the oscillation period be if the stiffness of the spring is reduced? Will it become shorter, longer, or unchanged?
Tuesday, July 8, 2014 at 7:15pm

physics
what is the resultant of two 65N identical one acting easterly and the northerly
Tuesday, July 8, 2014 at 7:07pm

Physics
A girl on a sled with a total mass of 90kg starts from an elevation of 100meters. At the bottom of the run her speed is 30m/s. How much energy in joules was lost due to friction?
Tuesday, July 8, 2014 at 7:02pm

Physics
Due to a strong wind from the west of 65 km/h, a plane ends up traveling 330 km/h [W 15 S] relative to the ground. What was the magnitude of the velocity of the plane relative to the air in km/h?
Tuesday, July 8, 2014 at 5:53pm

Physics
Do Newton's Law apply to motion inside your car? A.Yes, but only when at rest. B.Yes, but only when traveling at constant velocity or at rest. C.No, never. D.Yes, always. So I tried answering the question with D at first because I was thinking that it is a car in motion so...
Tuesday, July 8, 2014 at 5:38pm

Physics
You measure a uniform electric field of 13.3 x 10^3 N/C between two equipotential surfaces. One surface is at a potential of 1543 V and the other is at 951 V. What is the separation between the two surfaces? How would I solve this?...What equations would I use? Thanks!
Tuesday, July 8, 2014 at 5:24pm

physics
a man weighing around 260 pounds falling 5.5 feet vertically would have generated a force of how many pounds?
Tuesday, July 8, 2014 at 4:54pm

Physics
Jeffrey wants to swim his girlfriend who is straight across from him, on the other side of a river bank. The river has a current velocity of 4km/h [W]. The width of the river is 300m. If it takes Jeffrey 15 minutes to reach her, a) how fast should the boy swim to cross the ...
Tuesday, July 8, 2014 at 4:46pm

Physics
1. You are looking into a current carrying solenoid and notice that the compass needle indicates that you are at the south end of the magnetic field. What is the direction of the current in the coil and how do you know? Would it be clockwise because current moves towards the ...
Tuesday, July 8, 2014 at 4:02pm

Physics
Two charged particle 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 -11uc. What is the magnitude of the electric field 10 cm to the right of the negative charge? How do you solve this problem? ...
Tuesday, July 8, 2014 at 2:57pm

mechanism physics
if a 10kg block with a velocity of 10m/s collide with a stationary block of 5kg , after collission the two blocks move stick together.calculate the velocity after collision for a 10 kg block?
Tuesday, July 8, 2014 at 8:39am

PHYSICS
a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the tension in the string?
Tuesday, July 8, 2014 at 7:59am

physics
15 KG HEIGHT 200 METERES WHAT IS THE CHANGE IN TEMPERATURE
Tuesday, July 8, 2014 at 6:13am

Physics
Two parallel wires both carry currents directed from left to right .A circular wire loop lies in the plane of the two wires, mid-way between them.As always, assume the currents are positive charges. Sketch the changes in magnetic fields induced and the resultant current ...
Tuesday, July 8, 2014 at 3:11am

physics
On a 60 km straight road,a bus travels the first 30km with a uniform speed of 30kmh .How fast must the bus travel the next 30 km so as to have average speed of 40 kmh for entire trip.
Tuesday, July 8, 2014 at 2:55am

Physics-help please!
A net torque of 54 N.m is applied to a disk with a rotational inertia of 13.2 kg.m2 What is the rotational acceleration of the disk?
Tuesday, July 8, 2014 at 12:45am

Physics
In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the both cases are the same...
Monday, July 7, 2014 at 11:39pm

Physics
A battery with an emf of 10.3 V and internal resistance of 1.03 Ω carries a positive current of 0.550 A from its negative terminal to its positive terminal. (a) How long is required for 1.05 C of charge to pass through the battery? t = Q/I = (1.05)/(.550) = 1.909sec (b) ...
Monday, July 7, 2014 at 7:48pm

Physics
An acrobat is launched from a cannon at an angle of 60 degrees above the horizontal. The acrobat is caught by a safety net mounted horizontally at the height from which he was initially launched. Suppose the acrobat is launched at a speed of 26 m/s a) how long does it take ...
Monday, July 7, 2014 at 5:05pm

physics
A light, inextensible cord passes over a light, frictionless pulley with a radius of 11 cm. It has a(n) 14 kg mass on the left and a(n) 4.3 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 2.1 m apart. The acceleration of ...
Monday, July 7, 2014 at 4:30pm

physics
A block of mass 2.95708 kg lies on a friction- less table, pulled by another mass 3.23123 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the tension T of the rope between the two masses? Answer in units of N ...
Monday, July 7, 2014 at 4:22pm

Physics
A weight of 31 N is located a distance of 10.8 cm from the fulcrum of a simple balance beam. At what distance from the fulcrum should a weight of 17 N be placed on the opposite side in order to balance the system?
Monday, July 7, 2014 at 4:12pm

Physics
A force of 32 N is applied at the end of a wrench handle that is 27 cm long. The force is applied in a direction perpendicular to the handle as in the diagram. (a) What is the torque applied to the nut by the wrench? (b) What would the torque be if the force were applied half ...
Monday, July 7, 2014 at 4:12pm

Physics
A bicycle wheel is accelerating at the constant rate of 1.4 rev/s2 (a) If it starts from rest, what is the rotational velocity after 4.7s? (b) Through how many revolutions does it turn in this time?
Monday, July 7, 2014 at 4:11pm

Physics
The rotational velocity of a merry-go-round increases at a constant rate from 1 rad/s to 2.1 rad/s in a time of 5.8 s. What is the rotational acceleration of the merry-go-round?
Monday, July 7, 2014 at 4:11pm

Physics
Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
Monday, July 7, 2014 at 4:10pm

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...
Monday, July 7, 2014 at 4:02pm

physics
Two parallel wires both carry currents directed from left to right .A circular wire loop lies in the plane of the two wires, mid-way between them.As always, assume the currents are positive charges. Sketch the changes in magnetic fields induced and the resultant current ...
Monday, July 7, 2014 at 3:05pm

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...
Monday, July 7, 2014 at 3:05pm

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 3:03pm

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 3:02pm

PHYSICS
a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?
Monday, July 7, 2014 at 7:29am

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. A.)In which of the two cases is the change in ...
Monday, July 7, 2014 at 4:09am

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 4:06am

Physics
A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ...
Monday, July 7, 2014 at 4:04am

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