Saturday
April 18, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A Softball is Thrown at an angle of 45 degrees with the horizontal. It leaves the hand 2m above the ground. Its Initial Velocity is 20 m/s . Neglecting all external resistance, how far would it travel ? The point at which it hits the ground is at the same level as the ground ...
Monday, March 18, 2013 at 11:49am

physics
Show that the energy-momentum tensors for electromagnetism and for scalar field theory satisfy the dominant energy condition, and thus also the weak, null, and null dominant conditions. Show that they also satisfy w>-1
Monday, March 18, 2013 at 10:40am

physics
In an arcade game a 0.099 kg disk is shot across a frictionless horizontal surface by compressing it against a spring and releasing it.If the spring has a spring constant of 244 N/m and is compressed from its equilibrium position by 4 cm, find the speed with which the disk ...
Monday, March 18, 2013 at 5:17am

physics
A spherical bowling ball with mass m = 4.1 kg and radius R = 0.116 m is thrown down the lane with an initial speed of v = 8.9 m/s. The coefficient of kinetic friction between the sliding ball and the ground is ¦Ì = 0.34. Once the ball begins to roll without ...
Monday, March 18, 2013 at 5:15am

physics
A(n) 96.1 g ball is dropped from a height of59.1 cm above a spring of negligible mass.The ball compresses the spring to a maximum displacement of 4.75403 cm.The acceleration of gravity is 9.8m/s^2. Calculate the spring force constant k. Answer in units of N/m
Monday, March 18, 2013 at 5:14am

Physics
Betty weighs 449 N and she is sitting on a playground swing seat that hangs 0.55 m above the ground. Tom pulls the swing back and releases it when the seat is 0.76 m above the ground.The acceleration of gravity is 9.8 m/s^2. How fast is Betty moving when the swing passes ...
Monday, March 18, 2013 at 4:58am

physics
An ore car of mass 36000 kg starts from rest and rolls downhill on tracks from a mine. At the end of the tracks, 21 m lower vertically, is a horizontally situated spring with constant5.1×10^5N/m.The acceleration of gravity is 9.8 m/s^2. Ignore friction. How much is the ...
Monday, March 18, 2013 at 4:31am

Quantum Physics
a) What is QFT6 of 1/√2(|0>+|3>)? b) What is QFT6 of 1/√2(|1>+|4>)? c) What is QFT6 of 1/√3(|0>+|2>+|4>)? d) What is QFT6 of 1/√3(|1>+|3>+|5>)? Answer like: a) |0> = ; |1> = ; |2> = ; |3> = ; |4> = ; |5>...
Monday, March 18, 2013 at 3:31am

Physics
Electric charge flows through a wire, which naturally has a cylindrical cross section. Suppose the charge has a current density given by J = A/r, where A is a constant and r is the distance to the wire's central axis. How much current flows through the wire if its radius ...
Monday, March 18, 2013 at 3:26am

Physics
Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? What is the electric current in the pipe?
Monday, March 18, 2013 at 3:25am

Quantum Physics
Consider the following quantum circuit: bit.ly/Zlrijv (a) What quantum state do you have to input in order to get output |00>? (b) What quantum state do you have to input in order to get output |11>? (c) What quantum state do you have to input in order to get output 1/&#...
Monday, March 18, 2013 at 3:17am

Physics
A 80 kg climber is standing horizontally on a perfectly vertical cliff face. The climber is 1.8 m tall and is attached by a 2 m long rope fastened around their middle to a point on the cliff above them. What is the normal force the cliff face exerts on the climber in Newtons? ...
Monday, March 18, 2013 at 3:13am

Physics
A 10 g bullet is fired horizontally into a 1 kg block of wood hanging from a 1 m long string attached to the ceiling, getting stuck in the block. Due to the impact, the block then swings on the string to a maximum angle of 60 degrees with respect to the vertical. How fast was ...
Monday, March 18, 2013 at 3:02am

physics
Sally sells seashells by the seashore. In the morning, her sack of shells weighed 70 N. She sold seventy shells and in the evening her sack weighed 7 N. What was the average mass in kg of the shells she sold? The acceleration of gravity is −9.8 m/s2.
Monday, March 18, 2013 at 2:58am

Physics!
The sun goes around the center of our galaxy once every 250 million years. The sun is also 2.55×10^20 m from the center of our galaxy. What is the acceleration of our sun towards the center of the galaxy in m/s^2?
Monday, March 18, 2013 at 2:56am

Physics
Suppose that each of the three masses in the figure below has a mass of 5.50 kg, a radius of 0.0700 m, and are separated by a distance of 10.5 m. If the balls are released from rest, what speed will they have when they collide at the center of the triangle? Ignore ...
Monday, March 18, 2013 at 1:19am

physics
A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assume that the total energy of the ball-Earth system remains constant. (a) What is the tension in the string at the bottom? (Use the following ...
Monday, March 18, 2013 at 1:10am

physics
The combination of the force of gravity and my hand provide a net force of 40 N on a ball straight up. The ball accelerates at 100 m/s2 while it is in my hand. What is the mass of the ball in kg?
Monday, March 18, 2013 at 12:20am

Physics
For a certain Chemical reaction, you find that delta H = -100kJ and delta S = -200 J/K. What is the Gibbs free energy for the reaction at: (a) room temperature (b) 800 C (c) comment on whether the reactions are spontaneous or not
Monday, March 18, 2013 at 12:10am

Physics
Monochromatic x-rays (λ = 0.166 nm) from a nickel target are incident on a potassium chloride (KCl) crystal surface. The spacing between planes of atoms in KCl is 0.314 nm. At what angle (relative to the surface) should the beam be directed for a second-order maximum to ...
Sunday, March 17, 2013 at 11:46pm

Physics
A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm. Two point sources of ...
Sunday, March 17, 2013 at 11:46pm

physics(electric forces)
how do i figure out if an electric force between 2 stationary points are positive or negative?
Sunday, March 17, 2013 at 11:04pm

physics
A piece of iron has a mass of 0.4 kg and is initially at 500 degrees. It is lowered into a beaker with 20L of water at 22 degrees. What is the final equilibrium temperature? Assume there is no heat loss to the environment during the process.
Sunday, March 17, 2013 at 10:53pm

Physics
I am having a problem answering a physics question: A plane is heading due south and climbing at the rate of 60 km/hr. If its airspeed is 540 km/hr and there is a wind blowing 110 km/hr to the northwest, what is the ground speed of the plane?
Sunday, March 17, 2013 at 10:26pm

Physics
A roller coaster cart travelling due north at 20m/s that turns left during an interval of 4.0s without changing speed. Find the average acceleration. I understand the mathematics behind it (using pythagoras's theorem to find velocity and the formula acceleration = velocity...
Sunday, March 17, 2013 at 10:17pm

physics (Newton's Laws)
Please help, A cat is stuck in a tree. You are designated with the job to get it out, yet you do not want to climb the tree, because you may get stuck as well. Instead you set up a pulley system. A rope (consider it massless) runs from the seat you sit on over an ideal pulley...
Sunday, March 17, 2013 at 9:27pm

physics
i know this is stupid most likely but i missed a few weeks of lecture bc i was in hospital and i caught up on most of the notes but certain parts have me confuse, does anyone know how to tell if an electric force is negative or positive?
Sunday, March 17, 2013 at 9:24pm

physics
Consider a pendulum of length 4.720 m. The acceleration of gravity is 9 . 832 m / s 2 . a) What is its period at the North Pole? Answer in units of s 009 (part 2 of 6) 10.0 points b) What is its frequency? Answer in units of Hz
Sunday, March 17, 2013 at 7:37pm

physics
A 5.9 g coin sliding to the right at 23.4 cm/s makes an elastic head-on collision with a 17.7 g coin that is initially at rest. After the collision, the 5.9 g coin moves to the left at 11.7 cm/s.Find the amount of kinetic energy transferred to the 17.7 g coin.
Sunday, March 17, 2013 at 7:26pm

physics
A 740 N student stands in the middle of a frozen pond having a radius of 4.8 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 2.8 kg physics textbook horizontally toward the north ...
Sunday, March 17, 2013 at 7:17pm

Physics
Question: Calculate the direction of Earth's magnetic field. 3 components of the magnetic field: Geographic South to North: 0.01670 mT Geographic West to East: 0.002147 mT Up to down (up is the sky, down is the ground): 0.03722 mT Calculating angle East of North: tanθ...
Sunday, March 17, 2013 at 6:45pm

Physics
A potato of mass m is attached to a string of negligible mass and length L. The potato is released from rest from a horizontal position. When the potato is at point p, the string attached to the potato makes an angle θ with the horizontal. In terms of m,L,θ ,and any ...
Sunday, March 17, 2013 at 6:14pm

Quantum physics
Suppose Alice has three qubits in the state α|000>+β|111>. If she sends these qubits to Bob by applying the teleportation protocol to each of them separately, what is the state that Bob receives?
Sunday, March 17, 2013 at 5:17pm

Physics
A block of mass m1 = 5.0 kg is released from A, at a height h = 9.0 m. It makes a head-on elastic collision at B with a block of mass m2 = 11.0 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision. the track is frictionless
Sunday, March 17, 2013 at 5:03pm

Physics
A transformer has 25 turns in the primary coil and 200 turns in the secondary coil. If 12 V is connected to the primary coil and a 20-Ω device is connected to the secondary coil, calculate the current in Amperes passing through the device.
Sunday, March 17, 2013 at 4:26pm

Physics
Let |ø>=(1−i)/2 |0> −(1+i)/2|1> and |ϕ>=(2+i)/3|0>-2i/3|1>. What is <ø|ϕ>?
Sunday, March 17, 2013 at 4:24pm

physics
exercise 4.1 suppose the pilot start agin from rest
Sunday, March 17, 2013 at 3:36pm

Physics
Difference between parallel coplanar forces and non parallel coplanar forces
Sunday, March 17, 2013 at 3:31pm

Physics
The primary of a step-down transformer connected to a 240 V source has 1000 turns. The secondary has 100 turns. What is the output voltage of this transformer?
Sunday, March 17, 2013 at 3:27pm

Physics
A 0.026 kg golf ball moving at 19.6 m/s crashes through the window of a house in 5.6 10-4 s. After the crash, the ball continues in the same direction with a speed of 8.2 m/s. Assuming the force exerted on the ball by the window was constant, what was the magnitude of this ...
Sunday, March 17, 2013 at 1:07pm

Physics
Two wires run from the top of a pole 2.6m tall that supports a volleyball net. The two wires are anchored to the ground 2.0m apart, and each is 2.0m from the pole. The tension in each wire is 100N. here are the dimensions. I do not understand how to setup work. if could show I...
Sunday, March 17, 2013 at 11:51am

physics
A skier is going down a hill with a coefficient of friction of 0.21 and an angle of 7.5 degrees. if the skier has an initial velocity of 30 m/s, how fast will she be going after 10 s
Sunday, March 17, 2013 at 10:21am

physics
what is the angle betwean x axis and vector 3i-2j+4k
Sunday, March 17, 2013 at 5:27am

Physics
A 8.78 -m ladder with a mass of 23.8 kg lies flat on the ground. A painter grabs the top end of the ladder and pulls straight upward with a force of 236 N. At the instant the top of the ladder leaves the ground, the ladder experiences an angular acceleration of 1.90 rad/s2 ...
Sunday, March 17, 2013 at 3:06am

Physics
A 5.81 10-5 H solenoid is constructed by wrapping 62 turns of wire around a cylinder with a cross-sectional area of 8.20 10-4 m2 When the solenoid is shortened by squeezing the turns closer together, the inductance increases to 8.94 10-5 H. Determine the change in the length ...
Sunday, March 17, 2013 at 1:39am

Physics
The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of this generator? Answer ...
Sunday, March 17, 2013 at 1:32am

Physics
The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.8 m. The magnetic field of the generator is 0.21 T, and the coil rotates at an angular speed of 26 rad/s. What is the peak emf of this generator? Answer ...
Sunday, March 17, 2013 at 1:30am

physics
A Fletcher's trolley is set up over a cliff. If m1 = 40.5 kg (on top of the cliff) and m2 = 18.5 kg (hanging over the edge), what coefficient of friction is needed for the system not to move?
Sunday, March 17, 2013 at 12:54am

physics
Two wires run from the top of a pole 2.6 tall that supports a volleyball net. The two wires are anchored to the ground 2.0 apart, and each is 2.0 from the pole. The tension in each wire is 100. I do not understand how to setup work. if could show I would get better ...
Sunday, March 17, 2013 at 12:04am

physics
A solid cylinder of mass 20 kg rotate about its axis of rotation with angular speed 100m/s. The radius of the cylinder is 0.25m. What is the K.E. associated with the rotation of the cylinder what is the magnitude of the angular momentum of the cylinder about its axis
Saturday, March 16, 2013 at 10:59pm

Physics
Consider a pair of parallel plates with a potential difference of 12 V and are separated by 12 cm. What is the potential energy of a 1.0 C charge at point A, exactly 30. cm from each plate?
Saturday, March 16, 2013 at 8:49pm

physics 20
Two people, a and b, are pulling on a tree with ropes while person c is cutting the tree down. Person a applies a force of 80.0N (45.0degrees) on one rope. Person b applies a force of 90.0N (345degrees) on the other rope. Calculate the net force on the tree.
Saturday, March 16, 2013 at 8:02pm

Physics
A skier of mass 66 kg skis straight down a 11° slope at constant velocity. Draw a free-body diagram of the skier with the various external forces acting on her. Include the force of air resistance, which is directed opposite the velocity. (Do this on paper. Your ...
Saturday, March 16, 2013 at 7:15pm

physics
An 8.64g bullet is fired into a 365g block that is initially at rest at the edge of a table of h = 1.11 m height The bullet remains in the block, and after the impact the block lands d = 1.87 m from the bottom of the table. Determine the initial speed of the bullet?
Saturday, March 16, 2013 at 7:08pm

physics
Can someone explain the term magnitude when it comes to momentum
Saturday, March 16, 2013 at 6:53pm

physics
A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from 0 to 5.85 m/s in 0.712 s. What is the magnitude of the linear impulse experienced by a 70.5 kg passenger in the car during this time?
Saturday, March 16, 2013 at 6:35pm

Physics 11th grade 'Heat' `
1) While Laurie is boiling water to cook spaghetti, the phone rings, and all 1.5 kg of water boils away during her conversation.If the water was initially at 15℃, how much heat must have been gained for all of it to turn into a water vapor? 2)By January, the 3.0 kg of ...
Saturday, March 16, 2013 at 6:35pm

Physics
A series of pulses, each of amplitude 0.190 m, are sent down a string that is attached to a post at one end. The pulses are reflected at the post and travel back along the string without loss of amplitude. (a) What is the displacement at a point on the string where two pulses ...
Saturday, March 16, 2013 at 6:20pm

Physics
An object is dropped from rest. What is its instantaneous speed when it has been in motion for 7 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s
Saturday, March 16, 2013 at 6:17pm

Physics
A 500 kg elevator starts from rest. It moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this power compare with the motor power when the ...
Saturday, March 16, 2013 at 4:41pm

Physics
Sewage at a certain pumping station is raised vertically by 5.57 m at the rate of 1 860 000 liters each day. The sewage, of density 1 050 kg/m3, enters and leaves the pump at atmospheric pressure and through pipes of equal diameter. (a) Find the output mechanical power of the ...
Saturday, March 16, 2013 at 4:40pm

physics
A snowmobile is originally at the point with position vector 31.3 m at 95.0° counterclockwise from the x axis, moving with velocity 4.77 m/s at 40.0°. It moves with constant acceleration 1.92 m/s2 at 200°. After 5.00 s have elapsed, find the following. (a) its ...
Saturday, March 16, 2013 at 3:32pm

Physics
In a resonance-tube containing air, the source of sound is a small loudspeaker driven by a variable-frequency oscillator. The distance between successive antinodes is 10 cm for a frequency of 1625 Hz. When the frequency is slowly reduced, the standing wave pattern at first ...
Saturday, March 16, 2013 at 2:28pm

physics
3- An electric motor can accelerate a Ferris wheel of moment of inertia (I =20 000 kg.m2) from rest to (10.0 rev/min) in (12.0 s). When the motor is turned off, friction causes the wheel to slow down from (10.0 to 8.00 rev/min) in (10.0 s). Determine (a) the torque generated ...
Saturday, March 16, 2013 at 1:47pm

Physics
A standard man uses a bicycle of mass 30 kg to travel at constant speed along a 5 km long road up a hill. The hill rises 250 m above the starting point and the man needs 30 minutes to get to the top. How much work does the man do during the trip? What was the power use during ...
Saturday, March 16, 2013 at 12:44pm

physics
32.6 gram mass is whirled on a cord 131 cm long at a speed of 6 m/s. What is the centripetal acceleration of the mass in MKS units ?
Saturday, March 16, 2013 at 11:41am

Physics
A spacecraft in orbit around the moon measures its altitude by reflecting a pulsed 10Mz radio signal from the surface. If the spacecraft is 10km high what is the time between the emission of the pulse and the detection of the echo?
Saturday, March 16, 2013 at 9:52am

Physics
A plastic ball fallen 2m onto a hard floor and bounces to a height of 1.8m. Find:- {1}coefficient of restitution of the collision {2}the height of the next ball bounce
Saturday, March 16, 2013 at 7:18am

Physics
A plastic ball fallen 2m onto a hard floor and bounces to a height of 1.8m. Find:- {1}coefficient of restitution of the collision {2}the height of the next ball bounce
Saturday, March 16, 2013 at 7:17am

Physics
John is pushing a wheelbarrow filled with sand on a building site the total mass of the wheelbarrow and its content is 30kg. When he applies force of 20 the wheel barrow moves forward at constant speed. What is the Magnitude of the friction between the wheels and the ground?
Saturday, March 16, 2013 at 6:55am

physics
The engine on a 0.2kg model airplane exerts a forward force on the plane of 10N. If the plane accelerates at 2m/s2, what is the magnitude of the resistive force due to the wind acting on the airplane?
Saturday, March 16, 2013 at 6:00am

physics
Two identical thin wires are oriented along the x and y axes. With current on x plane going North. Current on y plane going West.Both carry the same current I, and there is no electrical contact between the wires. The points A, B, C, D are each equidistant from both wires. A: ...
Saturday, March 16, 2013 at 4:46am

physics
A basketball player is standing on the floor 10.0 m from the basket as in Figure P4.50. The height of the basket is 3.05 m, and he shoots the ball at a 40.0o angle with the horizontal from a height of 2.00 m. (a) What is the acceleration of the basketball at the highest point ...
Saturday, March 16, 2013 at 3:14am

Physics....PLEASE HELP
A motorcycle has a constant acceleration of 2.13 m/s2. Both the velocity and acceleration of the motorcycle point in the same direction. How much time is required for the motorcycle to change its speed from (a) 24.0 to 34.0 m/s, and (b) 54.0 to 64.0 m/s
Friday, March 15, 2013 at 8:53pm

physics
A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the vertical as indicated, what is the net ...
Friday, March 15, 2013 at 7:41pm

college physics
if a 12kg ball rolls down a ramp at 3 m/s and crashes into a pillow and it takes 0.65 s to stop the ball what is the momentum of the ball and the force exerted by the pillow? I would like to know the formula on how to figure this out.
Friday, March 15, 2013 at 7:12pm

physics
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 91.9 m/s2 for 1.53 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...
Friday, March 15, 2013 at 6:20pm

AP Physics B
An object is 21 cm in front of a diverging lens that has a focal length of -10 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.5?
Friday, March 15, 2013 at 6:16pm

Physics
What minimum sized balloon would you have to fill in order to be able to be lifted into the air? Take your mass to be 100 kilograms and the temperature of the outside air to be 20 degrees C. Neglect the mass of the balloon rubber and basket and assume that the balloon is ...
Friday, March 15, 2013 at 4:07pm

Language arts
Einstein was however also publishing papers in physics. How To create this sentence? a.was, however, also b.was however, also c. was, however also d.no error I chose b
Friday, March 15, 2013 at 2:21pm

Quantum Physics
I.Provide a unitary that maps |+> to |1> and |-> to |0> . Enter 0 in all boxes if no such unitary exists. (In this case, you have to enter 0 explicitly. Blanks are not accepted.) a b c d II.Provide a unitary that maps cos (30) |0> + sin (30) |1> to cos(-15) |...
Friday, March 15, 2013 at 12:58pm

Physics
A baseball with a mass of 0.15 kilograms collides with a bat at a speed of 40 meters/second. The duration of the collision is 8.0 × 10-3 seconds. The ball moves off with a speed of 50 meters/second in the opposite direction. What is the value of the force? A. 1.8 ×...
Friday, March 15, 2013 at 10:44am

Physics
A 1.0cm wide diffraction grating has 1000slits. It is illuminated by light of wavelength 550nm. What are the angles of the first two diffraction orders?
Friday, March 15, 2013 at 10:42am

physics
0.30-kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium (not stretched or compressed). The spring constant is 3000 N/m. What is the total kinetic energy in the system in Joules?
Friday, March 15, 2013 at 9:39am

Physics 11th grade 'Heat' .
Finishing his ginger ale, Ramesh stands at party holding his insulated foam cup that has nothing in it but 0.100 kg of ice at 0℃. 1) In sentence above, How much more heat must be gained to raise the temperature of the melted ice to room temperature of 23.0℃? 2)...
Friday, March 15, 2013 at 8:40am

physics
A 5.05kg sits on a ramp that is inclined at 36.5 degrees above horizontal.The coefficient of kinetic friction between box and ramp is mu k= 0.25. What horizontal force is required to move the box up the incline with a constsant acceleration of 4.3m/s^2?
Friday, March 15, 2013 at 1:04am

physics
Bernie whose mass is 70 kg leaves a ski jump
Friday, March 15, 2013 at 12:57am

physics
During takeoff, an airplane climbs with a speed of 140 m/s at an angle of 42 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...
Friday, March 15, 2013 at 12:28am

physics
Calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5100 km above the earth's surface.
Thursday, March 14, 2013 at 11:51pm

physics
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1720 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 81.0 kg, and the vine is 12.0 ...
Thursday, March 14, 2013 at 10:01pm

physics
differences btw a window unit air-conditioner and split-unit air conditioner.(2)explain d working principle of a freeze dryer using a diagram
Thursday, March 14, 2013 at 9:52pm

physics
what factors can affect a bodies temperature rise?
Thursday, March 14, 2013 at 9:48pm

physics
A light spring with a spring constant of 105.0 N/m rests vertically on the table, as shown in (a) below. A 2.05 g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 4.64 m3 and connected to the spring, causing the spring to stretch, as shown in (b) below...
Thursday, March 14, 2013 at 8:56pm

physics
A 1.85 m tall basketball player attempts a goal 9.3 m from a basket (3.05 m high). If he shoots the ball at a 45° angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?
Thursday, March 14, 2013 at 7:50pm

Physics
What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?
Thursday, March 14, 2013 at 7:41pm

Physics
What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?
Thursday, March 14, 2013 at 7:40pm

physics
A rocket moves upward, starting from rest with an acceleration of 30.5 m/s2 for 3.39 s. It runs out of fuel at the end of the 3.39 s but does not stop. How high does it rise above the ground?
Thursday, March 14, 2013 at 7:04pm

physics
When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1280 kg automobile traveling at 30.8 m/s comes to a halt after its brakes are applied, how much can the ...
Thursday, March 14, 2013 at 6:56pm

Physics 1
An astronaut in her space suit has a total mass of m1 = 76.9 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank of mass m2 = 12....
Thursday, March 14, 2013 at 5:51pm

physics
A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
Thursday, March 14, 2013 at 5:11pm

  1. Pages:
  2. <<Prev
  3. 152
  4. 153
  5. 154
  6. 155
  7. 156
  8. 157
  9. 158
  10. 159
  11. 160
  12. 161
  13. 162
  14. 163
  15. 164
  16. 165
  17. 166
  18. Next>>

Homework Help: Science

Members