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September 3, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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SCIENCE,PHYSICS
According to the legend, Zeus, the king of ancient Greek gods, had the power to create thunderbolts in his hands and throw them at his opponents. Suppose Zeus creates the thunderbolts by bringing his palms very close together and parallel to each other and then inducing equal ...
Wednesday, July 10, 2013 at 10:58am

SCIENCE,PHYSICS
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Wednesday, July 10, 2013 at 10:58am

SCIENCE,PHYSICS
A boy is spinning on a chair and holding a paper bag so that it is horizontal, and perpendicular to the axis of the rotation. What should be the angular velocity of the boy in radians/second so that the bottom of the bag breaks? Details and assumptions Assume paper breaks at ...
Wednesday, July 10, 2013 at 10:57am

SCIENCE,PHYSICS
Exact solutions for many-body problems are rarely encountered in physics. The following problem deals with a non-trivial motion of four charges. Due to the symmetry of the problem it is possible to determine the trajectories of the charges analytically. Four identical ...
Wednesday, July 10, 2013 at 10:57am

Physics
Suppose this dude wants to be able to touch the rim of a basketball goal. The rim is 3.048 m above the ground. The dude can reach up 2.45 m with his feet on the ground. (a) If the dude can achieve a liftoff speed of 2.80 m/s, what is his maximum upward displacement?
Wednesday, July 10, 2013 at 10:21am

Physics
The function y(x,t) = (15cm )cos(pi x -15t pi), with x in meters and t in seconds, describes a wave on taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y=+12cm?
Wednesday, July 10, 2013 at 8:48am

Physics
At a certain harbour, the tides cause the ocean surface to rise and fall a distance d(from highest level to lowest level) in simple harmonic motion, with a period of 12.5h. How long does it take for the water to fall a distance 0.250d from its highest level?
Wednesday, July 10, 2013 at 8:43am

Physics
A hollow spherical iron shell floats almost completely when submerged in water. The outer diameter is 50.0cm, and the density of iron is 7.87g/cm^3. Find the inner diameter.
Wednesday, July 10, 2013 at 8:36am

PHYSICS
An airplane is flying straight and level at a speed vo = 150 mph and with a constant time rate of increase of speed v' = 20 ft/s^2, when it starts to climb along a circular path with a radius of curvature p = 2000 ft. The airplane maintains v' constant for about 30s. ...
Tuesday, July 9, 2013 at 11:12pm

Physics
A phone cord is 2.85 m long. The cord has a mass of 0.254 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0.758 s. What is the tension in the cord?
Tuesday, July 9, 2013 at 8:55pm

physics[
Consider a spacecraft whose engines cause it to accelerate at 5.0 m/s2. (a) What would be the spacecraft’s acceleration at a later time if half its fuel has been used up? (b) What assumptions have you made in order to answer (a)?
Tuesday, July 9, 2013 at 8:25pm

physics
A 78-kg parachutist, in the first few seconds of her jump, accelerates at a rate of 7.4 m/s2 [down]. Calculate the force she experiences due to air resistance.
Tuesday, July 9, 2013 at 8:24pm

physics
A dolphin experiences a force of 320 N [up] when it jumps out of the water. The acceleration of the dolphin is 2.6 m/s 2 [up]. (a) Calculate the mass of the dolphin. (b) What would be the acceleration of the dolphin if it had the same strength but half the mass
Tuesday, July 9, 2013 at 8:20pm

Physics
An olympic sprinter can run 100yd in 9.0s. At the same rate, how long would it take the sprinter to run 100m?
Tuesday, July 9, 2013 at 8:03pm

Physics
A 0.363 g wire is stretched between two points 80.3 cm apart. The tension in the wire is 573 N. Find the frequency of first harmonic. Answer in units of Hz
Tuesday, July 9, 2013 at 6:32pm

Physics
7. Which of the following object(s) would be suitable for building a functional clock? Note: you must clearly mark your answer (for example, highlight it in red) from the multiple-choice list below and you must provide an explanation of your answer(s) to receive credit. Review...
Tuesday, July 9, 2013 at 6:01pm

Physics
For each of the following scenarios, indicate whether the oscillation period of the block becomes shorter, longer or remains unchanged. Note: you must clearly mark your answer (for example, highlight it in red) from the multiple-choice list below and you must provide an ...
Tuesday, July 9, 2013 at 5:42pm

Physics
The pendulum is transported to another planet where the acceleration due to gravity is smaller.
Tuesday, July 9, 2013 at 5:40pm

Physics
In Larry Niven’s science fiction novel Ringworld, a ring of material of radius 1.54 × 1011 m rotates about a star with a rotational speed of 1.5 × 106 m/s. The inhabitants of this ring world experience a normal contact force ~n. Acting alone, this normal...
Tuesday, July 9, 2013 at 4:49pm

Physics (mechanics)
A u-control airplane of mass m is attached by control wires of length L and negligible mass to the "pilot" who controls the lift provided by the wing FL. The wires control the plane's elevator or angle of attack. The plane's engine keeps it moving at constant...
Tuesday, July 9, 2013 at 4:48pm

Physics
A satellite moves in a circular orbit around the Earth at a speed of 5.9 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 1024 kg. The value of the universal ...
Tuesday, July 9, 2013 at 4:36pm

Physics
Both drawings show the same square, each of which has a side of length L=0.75 m. An observer O is stationed at one corner of each square. Two loudspeakers are locate at corners of the square, as in either drawing 1 or drawing 2. The speakers produce the same single-frequency ...
Tuesday, July 9, 2013 at 3:20pm

(pls help) physics
(Q1) A 50kg boy suspends himself from a point on a rope tied horizontally between 2 vertical poles. the 2 secments of the rope are then inclined at angles 30degrees and 60degrees respectively to the horizontal. The tension in the sefments of the rope is (a)25.0 and 43.3(b)50.0...
Tuesday, July 9, 2013 at 2:57pm

Physics
A 3.21 kg mass attached to a light string rotates on a horizontal, frictionless table. The radius of the circle is 0.855 m, and the string can support a mass of 15.3 kg before breaking. What maximum speed can the mass have before the string breaks? Answer in units of m/s
Tuesday, July 9, 2013 at 2:11pm

College Physics
1. In a region of two-dimensional space, there are three fixed charges: +1 mC at (0, 0), −2 mC at (18 mm, -3 mm), and +3 mC at (-8 mm, 12 mm). What is the net force on the −2-mC charge? Find the magnitude and direction (counterclockwise from the x-axis).
Tuesday, July 9, 2013 at 1:46pm

physics
The electric potential in a certain region is V = a x2 + b x + c, where a = 14 V/m2, b = −19 V/m, and c = 61 V. Determine the position where the electric field is zero. Answer in units of m Please help!
Tuesday, July 9, 2013 at 11:49am

physics
A 600 kg dragster accelerates from rest to a final speed of 120 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30 s?
Tuesday, July 9, 2013 at 10:20am

Physics
Calculate the coulomb force on q. They are all in a straight line q1, q2,q3. Q1:1.05 micro coulombs Q2:5.51 micro coulombs Q3:-2.15 micro coulombs The distance, r1, between q1 and q2 is 20.1cm. The distance, r2, between q2 and q3 is 15.3 cm. Also, calculate e coulomb force on q2
Tuesday, July 9, 2013 at 9:21am

Physics
What is the electric field at a point midway between a -7.34 micro coulombs and a +4.49 micro coulombs charge apart 31.5m apart?
Tuesday, July 9, 2013 at 9:17am

Physics (help steve)
Exact solutions for many-body problems are rarely encountered in physics. The following problem deals with a non-trivial motion of four charges. Due to the symmetry of the problem it is possible to determine the trajectories of the charges analytically. Four identical ...
Tuesday, July 9, 2013 at 5:58am

Physics (help steve)
A boy is spinning on a chair and holding a paper bag so that it is horizontal, and perpendicular to the axis of the rotation. What should be the angular velocity of the boy in radians/second so that the bottom of the bag breaks? Details and assumptions Assume paper breaks at ...
Tuesday, July 9, 2013 at 5:55am

Physics (help steve)
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Tuesday, July 9, 2013 at 5:54am

physics
The efficiency of a machine is in general defined as the ratio between useful (released) energy and the input energy. Therefore, the exact formulas for efficiency depend on the purpose of the machine. What's the difference in the maximal efficiency of a heat pump and a ...
Tuesday, July 9, 2013 at 3:53am

Physics
A 1650 kg car rolling on a horizontal surface has a speed of 20 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 3.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.)
Monday, July 8, 2013 at 10:49pm

Physics
What is the minimum work in joules needed to push a 1840 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)
Monday, July 8, 2013 at 10:38pm

physics
A box of unknown mass is sliding with an initial speed vi = 5.60 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 3.40 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100...
Monday, July 8, 2013 at 9:50pm

physics
The Moon has a mass of 7.35  1022 kg and its equatorial radius is 1.74  106 m. Earth’s mass is 5.97  1024 kg and its equatorial radius is 6.38  106 m. (a) Calculate the magnitude of the gravitational force exerted by i) the Moon on a fully suited 100-kg ...
Monday, July 8, 2013 at 9:18pm

physics
Calculate the time required for an astronaut to free-fall 50 m on the Moon. Please show and explain steps answer is 7.9s
Monday, July 8, 2013 at 9:17pm

physics
A 7.50-kg turkey standing at the top of Ishpatina Ridge, at 693 m the highest point in Ontario, weighs 73.5 N [down]. Calculate the magnitude of the gravitational field strength at this location. answer is 9.8N/Kg
Monday, July 8, 2013 at 9:16pm

physics
In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +3.62 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +1.66 m/s. The mass of the tackler ...
Monday, July 8, 2013 at 9:01pm

physics
A 95.9-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is ìk = 0.554. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.63 s, what is his initial speed?
Monday, July 8, 2013 at 8:17pm

physics
A diver springs upward with an initial speed of 1.66 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.0 m (measured from the board), assuming that the downward direction is chosen...
Monday, July 8, 2013 at 8:15pm

physics(shortest distance
A truck is traveling at a speed of 33.1 m/s along a level road. A crate is resting on the bed of the truck, and the coefficient of static friction between the crate and the truck bed is 0.632. Determine the shortest distance in which the truck can come to a halt without ...
Monday, July 8, 2013 at 8:05pm

general physics
On a banked race track, the smallest circular path on which cars can move has a radius of 119 m, while the largest has a radius of 159 m, as the drawing illustrates. The height of the outer wall is 16.8 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
Monday, July 8, 2013 at 7:58pm

Physics
Carol drops a stone into a mineshaft 122.5m deep. Calculate the time from when she hears it hit the bottom of the shaft. Assume the speed of sound in the air 343 m/s.
Monday, July 8, 2013 at 7:52pm

physics
A 50.7-g golf ball is driven from the tee with an initial speed of 51.2 m/s and rises to a height of 21.8 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 6.55 m below its highest point?
Monday, July 8, 2013 at 7:51pm

physics
A 0.662-kg basketball is dropped out of a window that is 6.32 m above the ground. The ball is caught by a person whose hands are 1.82 m above the ground. (a) How much work is done on the ball by its weight? What is the gravitational potential energy of the basketball, relative...
Monday, July 8, 2013 at 7:50pm

physics
A semi-trailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway truck ramp that is inclined at an angle of 13.0° above the horizontal. The semi-trailer coasts to a stop after traveling 190 m along the ramp. What was the ...
Monday, July 8, 2013 at 7:47pm

physics
A window has a glass surface of 2686 cm2 and a thickness of 7.4 mm. Find the rate of energy transfer by conduc- tion through this pane when the temperature of the inside surface of the glass is 66◦F and the outside temperature is 77 ◦F. Assume the thermal ...
Monday, July 8, 2013 at 7:35pm

physics
A 46 g ice cube at 0◦C is placed in 988 g of water at 90◦C. What is the final temperature of the mixture? The specific heat of water is 4186 J/kg · ◦C and its latent heat of fusion is 3.33 × 105 J/kg . Answer in units of ◦C
Monday, July 8, 2013 at 7:03pm

physics
a crane drops a 1.0 kg steel ball onto a steel plate. the ball's speed just before impact is 2.0 m/s. if the average impact force is 300 N, and the ball is in contact with the plate for 0.01 seconds, what is the bounce back speed right after the impact.
Monday, July 8, 2013 at 5:00pm

physics
a cannon with mass of 2000kg fires a 10kg shell at an angle of 60 degrees above the horizontal. if the recoil velocity of the cannon across the level ground is 0.5 m/s what is the velocity of the cannon ball.
Monday, July 8, 2013 at 4:38pm

Physics (help steve)
A boy is spinning on a chair and holding a paper bag so that it is horizontal, and perpendicular to the axis of the rotation. What should be the angular velocity of the boy in radians/second so that the bottom of the bag breaks? Details and assumptions Assume paper breaks at ...
Monday, July 8, 2013 at 3:35pm

physics
Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for this distance?
Monday, July 8, 2013 at 2:45pm

physics
A 27-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 200 J from 480 J. How high does she rise during this interval? Neglect air resistance.
Monday, July 8, 2013 at 2:20pm

physics
A 80.4-kg skier rides a 2630-m-long lift to the top of a mountain. The lift makes an angle of 19.4 ° with the horizontal. What is the change in the skier's gravitational potential energy?
Monday, July 8, 2013 at 2:12pm

physics
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 29 N. Starting from rest, the sled attains a speed of 2.1 m/s in 9.6 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
Monday, July 8, 2013 at 2:05pm

physics
A 1310-kg car is being driven up a 9.12 ° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of 541 N. A force F is applied to the car by the road and propels the car forward. In addition to these two forces, two other forces act ...
Monday, July 8, 2013 at 1:47pm

physics
A person pushes a 24.7-kg shopping cart at a constant velocity for a distance of 34.0 m on a flat horizontal surface. She pushes in a direction 23.2 ° below the horizontal. A 48.5-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
Monday, July 8, 2013 at 1:26pm

physics
A 75.0-kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.30 m. What is the work done on the man by (a) the gravitational force and (b) the escalator?
Monday, July 8, 2013 at 1:14pm

physics
The brakes of a truck cause it to slow down by applying a retarding force of 2350 N to the truck over a distance of 817 m. What is the work done by this force on the truck?
Monday, July 8, 2013 at 1:09pm

physics
a car manufacturer claims that his car, starting from rest, can attain a speed of 28m/s in a time of 20s. find the average acceleration of the car and the distance it travels in this time?
Sunday, July 7, 2013 at 9:56pm

physics
a 1000 kg car with an average power of 100 kw accelerates from 0 to 50 m/s. how long does it take to accomplish this
Sunday, July 7, 2013 at 9:05pm

physics
At the 2004 Olympic Games in Athens, Dwight Phillips won the gold medal in men’s long jump with a jump of 8.59 m. If the angle of his jump was 23°, what was his takeoff speed? (Treat the jumper as an object; ignore that his legs are in front of him when he lands.)
Sunday, July 7, 2013 at 7:49pm

physics
a football is thrown to a moving receiver .the football leaves the quarterback's hands 1.75m above the ground with a velocity of 17.0m/s[25deg]if the receiver starts 12.0m away from the quarterback along the line of flight of the ball when is is thrown , what constant ...
Sunday, July 7, 2013 at 7:46pm

physics
a football is thrown to a moving receiver .the football leaves the quarterback's hands 1.75m above the ground with a velocity of 17.0m/s[25deg]if the receiver starts 12.0m away from the quarterback along the line of flight of the ball when is is thrown , what constant ...
Sunday, July 7, 2013 at 4:21pm

physics
Participants in a road race take water from a refreshment station and throw their empty cups away farther down the course. If a runner has a forward speed of 6.20 m/s, how far in advance of a garbage pail should he release his water cup if the vertical distance between the lid...
Sunday, July 7, 2013 at 3:40pm

Physics
A roller in a sheet-metal processing plant has a diameter of 1.77 m and a mass of 5871 kg. Assume the roller is a solid cylinder. a) What is the moment of inertia of the roller? b) What is the kinetic energy of the roller when it spins at 4.28 rad/s? Please provide all work ...
Sunday, July 7, 2013 at 3:37pm

Physics
A 2.2-kg baseball is pitched to you at 21 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.17 s, what is the magnitude of the average force the bat exerted on the ball? Please show all work and provide any ...
Sunday, July 7, 2013 at 3:15pm

Physics
Two equal masses(1 and 2) are connected by an ideal rope across a pulley. This system is on a larger block A; 1 is on top of A, while 2 is hanging off the side, and the pulley rests on the corner of A. The question is what is the minimal acceleration of A such that masses 1 ...
Sunday, July 7, 2013 at 2:11pm

physics
A object of height 50cm is placed 100cm in front of a plane mirror.find (.A)the image distance. B)the distance between the object and the image . C)the height of the image
Sunday, July 7, 2013 at 11:01am

Physics
A 1.0 x 10^3 kg elevator carries a maximum load of 800.0 kg. A constant frictional force of 4.0 x 10^3 N retards the elevator's motion upward. What minimum power, in kilowatts, must the motor deliver to lift the fully loaded elevator at a constant speed of 3.0 m/s? Please ...
Sunday, July 7, 2013 at 10:18am

physics
Microwave ovens typically cook food using microwaves the a frequency of about 3.00 GHz (gigahertz 10 to the nine Hz). Show the wavelength of these microwaves traveling at the speed of light is 10cm.
Sunday, July 7, 2013 at 8:08am

(pls help) physics
(Q1)How much work is done when a bucket of mass 1.5kg with 10g of water in it is pulled up from the bottom of a well 8m deep? Take g=9.8m/s2 (a)100.3j(b)2000.5j(c)901.6j(d)453.7j (Q2) A 65kg sprinter completes a 100m race in 9.83s. Calculate the average kinetic energy of the ...
Sunday, July 7, 2013 at 6:10am

physics
a particle a of mass 2kg and particle b of mass 1kg are connected by alight elastic string c, and initially held at rest 0.9m apart on a smooth horizontal table with the string in tension. they are then simultaneously released . the string releases 12j of energy as it ...
Sunday, July 7, 2013 at 5:53am

physics
if a bus travels north with a constant velocity of3m/s, what is the displacement after 15 seconds?
Sunday, July 7, 2013 at 3:37am

physics
AN EMPTY DENSITY BOTTLE WEIGHS 25GRAMS. IT WEIGHS 65GRAMS WHEN FILL WITH WATER. CALCULATE THE DENSITY OF THE LIQUID.
Sunday, July 7, 2013 at 3:28am

physics
A pendulum bob swinging at a velocity of 10 m/sec would rise how high from its lowest point of its swing
Saturday, July 6, 2013 at 11:49pm

Physics
A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..
Saturday, July 6, 2013 at 8:44pm

Physics
a circular hoop of mass and radius spins like a wheel rotating about its centre with moment of inertia. its period it T (1) find the kinetic energy in terms of the given parameters 2. if such a hoop rolls with its centre moving at velocity v show that it rolls down an inclined...
Saturday, July 6, 2013 at 11:14am

physics
a circular hoop of mass and radius spins like a wheel rotating about its centre with moment of inertia. its period it T (1) find the kinetic energy in terms of the given parameters 2. if such a hoop rolls with its centre moving at velocity v show that it rolls down an inclined...
Saturday, July 6, 2013 at 11:13am

physics
a circular hoop of mass and radius spins like a wheel rotating about its centre with moment of inertia. its period it T (1) find the kinetic energy in terms of the given parameters 2. if such a hoop rolls with its centre moving at velocity v show that it rolls down an inclined...
Saturday, July 6, 2013 at 10:25am

physics
A 4 g bullet leaves the muzzle of a riffle with a speed of 350 m s-1. What force is exerted on the bullet when it is travelling down the 0.85 m long barrel of the rifle?
Saturday, July 6, 2013 at 9:59am

physics
two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector
Saturday, July 6, 2013 at 3:35am

physics
find the equilibrium of two is N forces acting upon a body,when the angle betweenthem is a)90degrees b)120degrees c)180degrees d)10degrees e)45degrees
Saturday, July 6, 2013 at 3:32am

Physics
A capacitor has stored energy U. If the voltage and plate separation are both doubled, the new stored energy is ____. Answer 2U a) 2U b) U/2 c) U d)4U
Saturday, July 6, 2013 at 12:36am

physics
Two racquetballs, each having a mass of 147 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal.
Friday, July 5, 2013 at 10:59pm

physics
Two racquetballs, each having a mass of 144 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal.
Friday, July 5, 2013 at 3:25pm

Physics
A 4000N block is moved up a slope that is 20 degrees to the horizontal. If the coefficient of friction is 0.3, find the force parallel to the slope to: a) move the load up the slope b) prevent the load from sliding back
Friday, July 5, 2013 at 11:47am

Physics (help steve)
A thin aluminum ring hangs vertically from a torsion spring. A torsion spring when twisted exerts a restoring torque given by τ=−κθ where θ is the angle of twist. Suppose that the ring undergoes small torsional oscillations while it is being cooled ...
Friday, July 5, 2013 at 9:29am

physics
A football, if it was kicked when initially at rest, is inflated such that it will move in the direction of the kick with h=0.8 of the kicking foot's velocity We now consider the same ball being kicked while it's moving towards the football player's foot. Before ...
Friday, July 5, 2013 at 4:19am

physics
A capacitor has stored energy U. If the voltage and plate separation are both doubled, the new stored energy is ____.
Friday, July 5, 2013 at 2:38am

Physics
Mary walks west at 2.0m/s for 15 seconds, then north at 3.0m/s for 2o seconds and then east at 4.0m/s for 0 seconds. What is her displacement answer is (108m(N56 DEgrees E)
Thursday, July 4, 2013 at 9:57pm

physics
A boat sails 5.0(45 degrees W of N). It then hanges direction and sails 7.0km(45 degrees S of E) where does the boat end up with reference to its starting point.? Please explain steps answer is 2km(45 degrees S of E)
Thursday, July 4, 2013 at 9:45pm

physics
A student runs through a field 100m(E) then 200m(S) and finally 50(45 degrees S of E find his final position relative to his starting point? please explain steps Answer is 272(60 degrees S of E)
Thursday, July 4, 2013 at 9:36pm

Physics
Jim is 100m(S) of Paul. Paul begins to walk east at 2.0m/s the same time Jim begins to walk west at 3.0m/s. what is the displacement of Jim from Paul 20 seconds later? Please explain steps Answer is 141(SW)
Thursday, July 4, 2013 at 9:30pm

Physics (Thermodynamics)
27.300kg of Copper at 35.000 degrees Celsius receives 460.000kJ of heat. Calculate the final temperature of the metal. ANS = degrees Celsius Copper specific heat = 0.39kJ/kg degrees Celsius. Q = mc (t2 - t1) Q = 460.000kJ m = 27.300kg c = 0.39kJ/kg t1 = 35 degrees Celsius t2...
Thursday, July 4, 2013 at 8:08pm

physics
In the following figure m_1 = 20.0kg kg and á alpha = 50.9 ∘ ^\circ. The coefficient of kinetic friction between the block and the incline is ì k = 0.40 What must be the mass m 2 of the hanging block if it is to descend 9.00m m in the first 3.00s s after ...
Thursday, July 4, 2013 at 1:49pm

SCIENCE,PHYSICS
A truck of mass 3000 kg is harnessed to a trailer (Trailer A) of mass 1000 kg. The trailer is hooked to ANOTHER trailer (Trailer B) of mass 500 kg. The truck begins to accelerate to the right at 1 m/s2, pulling the trailers along. What is the ratio of the force the truck ...
Thursday, July 4, 2013 at 1:59am

physics
A jet starting from rest reaches a speed of 241km/h on 96.0m of runway. Determine the magnitude of the Jet's acceleration? Answer is 23.3m/s^2
Wednesday, July 3, 2013 at 7:43pm

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