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August 22, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

Physics
Two charge 10C and 5C but no radius. How can I determine Force?
Monday, July 7, 2014 at 3:05am

college physics 2
steel train rails are placed end to end with space in between on a day where a temperature is 30 degrees. How much stress will be build if the temperature is increase to 150 degrees .assume that the original is 1.5m
Monday, July 7, 2014 at 2:12am

Physics
A rifle with a mass of 1.84 kg fires a bullet with a mass of 4.5 g (0.0045 kg). The bullet moves with a muzzle velocity of 413 m/s after the rifle is fired. (a) What is the momentum of the bullet after the rifle is fired? (b) If external forces acting on the rifle can be ...
Monday, July 7, 2014 at 12:22am

Physics
A 60-kg front seat passenger is moving in a car initially with a speed of 18.4 m/s is brought to rest by an airbag in 0.6 sec. (a) What is the impulse acting on the passenger? (b) What is the average force acting on the passenger in this process?
Monday, July 7, 2014 at 12:22am

Physics
A force of 36.7 N acts on a ball for 0.3 sec. If the ball is initailly at rest (a) What is the impulse on the ball? (b) What is the final momentum of the ball?
Monday, July 7, 2014 at 12:22am

Physics
A bowling ball has a mass of 7 kg and a speed of 1.73 m/s. A baseball has a mass of 0.12 kg and a speed of 25.1 m/s. Which ball has the larger momentum? a. The bowling ball. b. More information needed c. The baseball. d. Both have the same momentum
Monday, July 7, 2014 at 12:22am

Physics
An average force of 208 N acts for a time interval of 0.058 s on a golf ball. (a) What is the magnitude of the impulse acting on the golf ball? (b) What is the change in the golf ball's momentum?
Monday, July 7, 2014 at 12:22am

Physics
A 24.0-V battery is connected to a 4.70-µF capacitor. How much energy (in J) is stored in the capacitor? I'm guessing this is really easy but my professor sent us into the homework blind...again...
Sunday, July 6, 2014 at 9:54pm

physics
an object displace 6 meters toward the east and 8 meters toward the north find its resultant displacement in graphical
Sunday, July 6, 2014 at 9:40pm

physics
how does the gas stove emit light?
Sunday, July 6, 2014 at 3:39pm

physics
Karen and Bill are rearranging furniture in their house, but they don’t always agree on where all the items should go. At one instant, Karen pushes a large chest of drawers (mass of 20kg) horizontally to the right with a force of 35N, while Bill pushes horizontally to the...
Sunday, July 6, 2014 at 10:43am

physics
How many electrons pass through a lamp in 3 minutes.If the current is 300 ma?
Sunday, July 6, 2014 at 10:36am

physics
How much force is needed to accelerate a 50kg rider and his 250kg motorcycle at 4m/s27
Sunday, July 6, 2014 at 6:45am

PHYSICS
he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
Sunday, July 6, 2014 at 4:43am

PHYSICS
the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
Sunday, July 6, 2014 at 4:40am

PHYSICS
an ant walks 22 cm in a northerly directions turns and walks southeasterly (45 degree East Of South) a distance of 47 cm what is a resultant displacement?
Sunday, July 6, 2014 at 4:37am

PHYSICS
a motorcycle is driven 50 km west then 30 km south and 25 km 30 degree west of south show the vector diagram find the total displacement of motorcycle
Sunday, July 6, 2014 at 4:21am

Physics
What is the value of each of the angles of a triangle whose sides are 95, 150, 190 cm in length? I have tried to do this problem, don't get me wrong, but I don't really know where to go. Can someone tell me how to even approach this problem? The textbook states that ...
Sunday, July 6, 2014 at 1:20am

physics
rex stands 3m away from a concave mirror.his hieght is 1.70m. If the image formed on the screen is 12cm from the mirror,what is the size of the image
Saturday, July 5, 2014 at 9:02pm

physics
An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...
Saturday, July 5, 2014 at 3:00pm

PHYSICS
a car is proceeding at a speed of 14.0m/s when it collides with a stationary car in front. during the collision the first car moves a distance of 0.300 m as it comes to a stop. the driver is wearing her seat belt, so she remains in her seat during the collision. if the drivers...
Saturday, July 5, 2014 at 12:35pm

physics
A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation... A) can happen because the extra ...
Saturday, July 5, 2014 at 12:30pm

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?
Saturday, July 5, 2014 at 11:48am

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?
Saturday, July 5, 2014 at 11:44am

PHYSICS
a locomotive pulls 10 identical freight cars with an acceleration of 2m/s^2. How does the forced between the third and fourth cars compare to the force between the seventh and eighth cars?
Saturday, July 5, 2014 at 11:41am

physics
two forces F1 and F2 acting at a point have a resultant F. If F2 is doubled, F is also doubled. If F2 is reversed in direction, then also F is doubled, then options A. F1:F=1:1 B. F2:F=root3:root2 C. F1:F2=root2:root3 D. F1:F2:F=root2:root3:root2
Saturday, July 5, 2014 at 10:24am

physics
Two forces of magnitude 20 newtons and 25 newtons respectively act at a point. If the resultant force is 39 newtons, the angle between the forces has to be nearly?
Saturday, July 5, 2014 at 10:03am

physics
the vectors sum of two vectors of magnitudes 10 units and 15 units can never be?
Saturday, July 5, 2014 at 9:22am

PHYSICS
T.E of e in excited state is E . WHAT IS KINETIC ENERGY with proper sign
Saturday, July 5, 2014 at 5:58am

physics
An elevator is travelling upwards at 15m/s2 and the hoisting cable is cut when it is 40 m from the ground. Determine the maximum height reached by the elevator & the velocity just before it hits the ground.
Saturday, July 5, 2014 at 3:54am

Physics
Four rocks are thrown horizontally from a building, with varying speeds and from various floors. Rock 1 lands a distance r away from the building, rock 2 lands 2r away from the building, rock 3 lands at distance 3r, and rock 4 at 4r. Ignore air resistance. Drag the rocks into ...
Saturday, July 5, 2014 at 12:15am

Physics- check answer please
1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy? my answer: 74 J 2. What is the speed of a 0.25 kg ball if its kinetic energy is 15 J? my answer: 11 m/s 3. if the speed of an object is tripled and ...
Friday, July 4, 2014 at 9:00pm

Physics
a child throws a ball in a net where it gets stuck. Does the motion of this ball defy the law of conservation of momentum? explain
Friday, July 4, 2014 at 5:32pm

physics word problem
A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. What is the speed of the raft just after the girl dives?
Friday, July 4, 2014 at 5:29pm

Physics
A dog sits on the left end of a boat of length L that is initially adjacent to a dock to its right. The dog then runs toward the dock, but stops at the end of the boat. If the boat is H times heavier than the dog, how close does the dog get to the dock? Ignore any drag force ...
Friday, July 4, 2014 at 2:59pm

physics
Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass 900 kg and is heading north and car 2 has mass 900 kg and is heading west. The two cars collide at the intersection, and stick together as a result of the collision. The police report ...
Friday, July 4, 2014 at 2:58pm

physics
A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are ...
Friday, July 4, 2014 at 2:57pm

Physics
Two NBA players are revered for their ability to dunk a basketball, i.e., both players can jump very high. The first player is a tall, heavy center, and the second player is an average height, slim guard. The first player is 1.5 times the mass of the second player, and the ...
Friday, July 4, 2014 at 2:57pm

Physics
Two skaters, Alan and Betsy, move toward each other on a very smooth skating rink. Their masses and speeds are respectively: 60 kg; 4.0 m/s and 50 kg; 0.4 m/s. After the skaters collide and use their hands to push each other away, Alan is moving backwards at 2.0 m/s. Taking ...
Friday, July 4, 2014 at 2:56pm

Physics (Classical Mechanics)
Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the groundat the n-th click, in metres, be ...
Friday, July 4, 2014 at 8:23am

physics
The vectors sum of two vectors of magnitude 10units and 15units can never be
Friday, July 4, 2014 at 6:31am

physics
Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium?
Friday, July 4, 2014 at 6:28am

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