Friday

February 27, 2015

February 27, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

Masses 15 kg and 8 kg are connected by a light string that passes over a friction-less pulley with the 15 kg mass on a table and the 8 kg mass hanging off the edge. The acceleration of gravity is 9.8 m/s2. If the 15 kg mass, initially held at rest on the table, is released and...
*Tuesday, February 19, 2013 at 5:53pm*

**Physics **

A plant falls from the windowsill of an apartment in a very tall building. If the floor of your apartment is 12.19 m above the ground, and it takes the plant 0.2580 seconds to cross your 9 ft window, from what height did the plant fall? ? m Explain what would be different if ...
*Tuesday, February 19, 2013 at 5:07pm*

**AP Physics B**

A soap bubble of index of refraction 1.43 strongly reflects both the red and the green components of white light. What minimum film thickness allows this to happen? (In air,the wavelength of red light is 703 nm, of green light 502.143 nm.) Answer in units of nm
*Tuesday, February 19, 2013 at 3:55pm*

**Physics**

A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity. What is the coefficient of friction for the surface?
*Tuesday, February 19, 2013 at 2:54pm*

**Physics **

A mass is attached to a spring stretches it 2.5 cm from equilibrium. The mass is lightly tapped and set in an oscillation. What is the angular frequency of the of the oscillation?
*Tuesday, February 19, 2013 at 2:53pm*

**Physics**

A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity. What is the coefficient of friction for the surface?
*Tuesday, February 19, 2013 at 1:57pm*

**Physics**

A car is traveling at 66.9 mi/h on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.13, what is the minimum distance in which the car will stop? (1 mi = 1.609) Answer in units of m
*Tuesday, February 19, 2013 at 1:56pm*

**physics**

a particle completes 4 revolution/sec on a circular path of radius 0.25m.calculate angular velocity
*Tuesday, February 19, 2013 at 1:15pm*

**physics**

If the 60-kg player is running forward at 7.0m/s when she makes contact with the dummy, what is the players velocity at the end of the 1.20s impact?
*Tuesday, February 19, 2013 at 12:54pm*

**physics**

Consider the system shown, with m1 = 2.0 kg, m2 = 3.0 kg, and α = 30o. The force F acts horizontally to the left and the kinetic coefficient of friction between m1 and the incline is μk = 0.40. The mass m2 is moving up at a constant speed. (a) What is the magnitude ...
*Tuesday, February 19, 2013 at 12:24pm*

**physics**

Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliﬀ divers leave the ...
*Tuesday, February 19, 2013 at 11:29am*

**physics**

Bill kicks a rock oﬀ the top of his apartment building. It strikes a window across the street 12 m away. The acceleration of gravity is 9.8 m/s^2. If the window is 16 m below the position where Bill contacted the rock, how long was it in the air?
*Tuesday, February 19, 2013 at 11:18am*

**physics**

a small conducted sphere is attached to the end of an insulating rod .it carries a charge of +5.0*10-9 C. the plates ,which are 4.0 cm apart, are connected to a 50 000 V supply.
*Tuesday, February 19, 2013 at 10:46am*

**Physics**

How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
*Tuesday, February 19, 2013 at 9:52am*

**Physics**

Bruno drags a box with a mass of 50-kg along a frictionless floor by pulling the box with 18-N at an angle 40° above the horizontal. What is the net work done on the box if the displacement of the box is 10.5-m?
*Tuesday, February 19, 2013 at 9:29am*

**Physics**

How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
*Tuesday, February 19, 2013 at 9:22am*

**Physics**

A 10.0-kg object experiences a drag force due to air resistance. The magnitude of this drag force depends on its speed, and obeys the equation Fdrag =(12.0 N-s/m)v + (4.00 N-s2/m2)v2. (a) What is the terminal speed of this object if it is falling due to gravity? (b) At what ...
*Tuesday, February 19, 2013 at 9:16am*

**physics**

Consider the system shown, with m1 = 2.0 kg, m2 = 3.0 kg, and á = 30o. The force F acts horizontally to the left and the kinetic coefficient of friction between m1 and the incline is ìk = 0.40. The mass m2 is moving up at a constant speed. (a) What is the ...
*Tuesday, February 19, 2013 at 9:15am*

**physics**

if 3 resistors of 2,3 and 5 ohms are connected in parallel and a battery of 10 volts is applied across it, then what is the potential drop across 3 ohms resistor ?
*Tuesday, February 19, 2013 at 9:14am*

**physics**

A 10-g bullet of unknown speed is shot horizontally into a 2-kg block of wood suspended from the ceiling by a cord. The bullet hits the block and becomes lodged in it. After the collision, the block and the bullet swing to a height 30cm above the original position. What was ...
*Tuesday, February 19, 2013 at 8:45am*

**physics**

a net force of 5000N accelerates a car from rest to 20m/s in 10s. what is the net force exerted on the car
*Tuesday, February 19, 2013 at 5:52am*

**AP Physics**

So my question is about projectile motion. We just learned in class about the equation for finding the range: R=v^2sin(2theta)/g I understand that and I think I see where it comes from. My question is, if someone were to collect data on the projectile range for different ...
*Tuesday, February 19, 2013 at 2:52am*

**physics.....**

Two soccer players on a breakaway start from midfield and run straight down the field with a separation of d=5 m and with the same velocity v=7 m/s. The last defensive player of the other team approaches the player who has the ball, so that person decides to pass the ball with...
*Tuesday, February 19, 2013 at 2:48am*

**physics**

You and a friend are going to a river, where they have a rope swing. Your friend, who has a mass of 60 kg, hops on the end of the rope. You tug horizontally on your friend with a force of 300 N, pulling them back until you can't move them any more. Then you let go and ...
*Tuesday, February 19, 2013 at 2:47am*

**Physics**

Planet Earth as a Spring. Assume that the Earth is perfect sphere of mass M=5.98x10^24kg, radius 6,370km, and uniform density. Imagine a long, straight tunnel through the center of the Earth, connecting the North and South poles . A capsule of mass m is dropped into this ...
*Tuesday, February 19, 2013 at 1:04am*

**Physics**

Two blocks sit on a horizontal surface. They are connected to each other by a massless cord. The block on the left has a mass of 4.8 kg and the block on the right has a mass of 2.2 kg. Another massless cord is attached to the block on the right and pulls that block with a ...
*Monday, February 18, 2013 at 11:55pm*

**physics- mechanics**

A light, rigid rod with two masses attached to its ends, one of mass 3M and one of mass M, is pivoted about a horizontal axis. The mass 3M is length L from the pivot point and hte mass M is length 2L from the pivot point. When released from a horizontal orientation, the rod ...
*Monday, February 18, 2013 at 9:25pm*

**Physics**

A 4.19-F and a 7.46-F capacitor are connected in series across a 35.0-V battery. A 8.46-F capacitor is then connected in parallel across the 4.19-F capacitor. Determine the voltage across the 8.46-F capacitor.
*Monday, February 18, 2013 at 8:03pm*

**Physics**

the energy that can extracted from a storage battery is always less than the energy that goes into it while it is being charged. why?
*Monday, February 18, 2013 at 7:58pm*

**Physics**

Determine the voltage across the 5.0-Ù resistor in the drawing.
*Monday, February 18, 2013 at 7:35pm*

**Physics**

A battery delivering a current of 55.0 A to a circuit has a terminal voltage of 21.8 V. The electric power being dissipated by the internal resistance of the battery is 36 W. Find the emf of the battery.
*Monday, February 18, 2013 at 7:00pm*

**Physics ~ CONSERVATION OF MOMENTUM~**

1.) A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed afterward? 2.) A 3.0 kg ball at 3 m/s and strikes a 1.5 kg ball moving at -2 m/s. After the ...
*Monday, February 18, 2013 at 6:57pm*

**Physics**

The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is electric and ...
*Monday, February 18, 2013 at 6:49pm*

**physics**

Two capacitors have the same plate separation, but one has square plates and the other has circular plates. The square plates are a length L on each side, and the diameter of the circular plate is L. The capacitors have the same capacitance because they contain different ...
*Monday, February 18, 2013 at 6:49pm*

**Physics**

A 0.255 kg ball was thrown vertically upward from a bridge 10.3 meters above the ground with an initial velocity if 31.7 meters/second. Calculate the balls velocity when it hits the water.
*Monday, February 18, 2013 at 6:46pm*

**physics**

Suppose that a qubit is in the state |Ï†âŒª = a|0âŒª + 1 âˆ’ a2 |1âŒª where a âˆˆ [âˆ’1, 1]. If we ï¬rst perform a standard basis measurement on this qubit ...
*Monday, February 18, 2013 at 6:40pm*

**physics**

Consider the state |ÏˆâŒª = âˆš2 |0âŒª + âˆš2 |1âŒª from the previous question. To estimate the phase Î¸, we measure |ÏˆâŒª in the sign basis. What ...
*Monday, February 18, 2013 at 6:38pm*

**physics**

The membrane that surrounds a certain type of living cell has a surface area of 4.9 x 10-9 m2 and a thickness of 1.2 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.5. (a) The potential on the outer surface of the ...
*Monday, February 18, 2013 at 6:34pm*

**PHYSICS**

This is the same question as last time. "A plane is flying 25 degrees north of west at 190 km/h and encounters a wind from 15 degrees north of east at 45 km/h. What is the planes new velocity with respect to the ground in standard position?" Elena kindly gave me this...
*Monday, February 18, 2013 at 4:40pm*

**Physics**

A plane is flying 25 degrees north of west at 190 km/h and encounters a wind from 15 degrees north of east at 45 km/h. What is the planes new velocity with respect to the ground in standard position?
*Monday, February 18, 2013 at 3:33pm*

**Science-Physics**

20 (part 1 of 2) The initial speed of a body is 6.61 m/s. What is its speed after 3.92 s if it accelerates uniformly at 3.46 m/s/s? Answer in units of m/s 21 (part 2 of 2) 10.0 points What is its speed after 3.92 s if it accelerates uniformly at −3.46 m/s/s? Answer in ...
*Monday, February 18, 2013 at 3:20pm*

**Physics**

The electric potential energy stored in the capacitor of a defibrillator is 77 J, and the capacitance is 123 µF. What is the potential difference that exists across the capacitor plates?
*Monday, February 18, 2013 at 3:18pm*

**physics**

An equipotential surface that surrounds a point charge q has a potential of 590 V and an area of 1.20 m2. Determine q.
*Monday, February 18, 2013 at 2:31pm*

**Physics**

Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is each particle moving ...
*Monday, February 18, 2013 at 2:19pm*

**Physics**

The electric field between the plates of a paper-separated capacitor is 8.18×104 . The plates are 2.20 apart, and the charge on each plate is 0.795 .Determine the capacitance of this capacitor. Determine the area of each plate.
*Monday, February 18, 2013 at 1:59pm*

**Physics**

The drawing shows six point charges arranged in a rectangle. The value of q is 9.27 µC, and the distance d is 0.17 m. Find the total electric potential at location P, which is at the center of the rectangle.
*Monday, February 18, 2013 at 1:15pm*

**physics science**

a 750kg motor car is moving at a constant force of 27m/s on a staight horizontal road. The frictional force expirience by the motor car travelling on the road is 680N. Calculate the power delivered by the motoq car
*Monday, February 18, 2013 at 11:54am*

**physics science**

a 750kg motor car is moving at a constant force of 27m/s on a staight horizontal road. The frictional force expirience by the motor car travelling on the road is 680N. Calculate the power delivered by the motoq car
*Monday, February 18, 2013 at 11:52am*

**Physics**

When point charges q1 = +3.1 ìC and q2 = +5.1 ìC are brought near each other, each experiences a repulsive force of magnitude 0.54 N. Determine the distance between the charges.
*Monday, February 18, 2013 at 11:06am*

** Physics !**

Paul pulls a stalled car with a rope 493-m with a force of 267-N, calculate the powered generated by Paul after 9 minutes pulling it down the road.
*Monday, February 18, 2013 at 9:52am*

**physics**

A baseball pitcher throws a fastball at 51.6 m/s. If the batter is 18 m from the pitcher, approximately how much time does it take for the ball to reach the batter?
*Monday, February 18, 2013 at 9:51am*

**Physics**

An airplane originally at rest on a runway accelerates uniformly at 6.2 m/s2 for 12 sec. During this 12 sec-interval the air plane travels an approximate distance of?
*Monday, February 18, 2013 at 9:51am*

**Physics**

A 67.8 kg man sits in a 6.3 kg chair so that his weight is evenly distributed on the legs of the chair. Assume that each leg makes contact with the floor over a circular area with a radius of 2.4 cm. What is the pressure exerted on the floor by each leg? The acceleration of ...
*Monday, February 18, 2013 at 9:14am*

**physics**

An airplane starts at rest and accelerates down the runway for 20s. At he end of the runway, it's velocity is 80 m/a north. What is its acceleration?
*Monday, February 18, 2013 at 8:27am*

**physics**

Collision of charged particles}} A proton moves in vacuum and enters a region where there's another proton at rest. The protons interact and the angle between their velocities is measured when they are far away from each other. What is the most likely value for this angle ...
*Monday, February 18, 2013 at 1:20am*

**physics!**

Recently, a meteor impacted Russia. The estimate of the meteor's size was 10 tons and it was estimated to have entered the earth's atmosphere at a speed of 14,600 m/s. What was the total kinetic energy of such a meteor in J as it entered the atmosphere?
*Monday, February 18, 2013 at 1:04am*

**Physics help!!**

An archer shoots an arrow with a velocity of 45 m/s at an angle of 50 degrees with the horizontal.An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum intial speed necessary to meet the path of the arrow. (...
*Monday, February 18, 2013 at 12:49am*

**Physics help!!**

A tire 0.500 m in radius at a constant rate of 200 rev/min.Find the speed and acceleration of a small stone lodged in the tread of the tire( on its outer edge).
*Monday, February 18, 2013 at 12:38am*

**physics**

The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is electric and ...
*Monday, February 18, 2013 at 12:30am*

**physics**

(a) A defibrillator passes 11.0 A of current through the torso of a person for 0.0300 s. How much charge moves? C (b) How many electrons pass through the wires connected to the patient? electrons
*Sunday, February 17, 2013 at 9:55pm*

**physics**

Equal 0.400-kg mass of lead and tin at 60 degrees celsius are placed in 1kg of water at 20 degrees celsius. a) what is the equilibrium temperature of the system? b)if an alloy is half lead and half tin by mass, what specific heat would you anticipate for the alloy? c) how many...
*Sunday, February 17, 2013 at 9:48pm*

**physics**

In open heart surgery a much smaller amount of energy will defibrillate the heart. (a) What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? kV (b) Find the amount of stored charge. mC
*Sunday, February 17, 2013 at 9:47pm*

**physics**

610 C passes through a flashlight in 0.510 h. What is the average current?
*Sunday, February 17, 2013 at 9:40pm*

**physics**

A 1.50-V battery supplies 0.244 W of power to a small flashlight. If the battery moves 2.53 1020 electrons between its terminals during the time the flashlight is in operation, how long was the flashlight used?
*Sunday, February 17, 2013 at 9:40pm*

**physics**

What voltage is applied to the 5.00 µF capacitor of a heart defibrillator that stores 35.0 J of energy? In kv.
*Sunday, February 17, 2013 at 9:38pm*

**Physics**

A bicycle wheel of radius 0.30 m is spinning at a rate of 60 revolutions per minute. What is the centripetal acceleration of a point that is 0.11 m from the outer edge of the wheel?
*Sunday, February 17, 2013 at 8:43pm*

**Physics**

A circular conducting coil with radius 3.40 cm is placed in a uniform magnetic field of 1.090 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the coil during this ...
*Sunday, February 17, 2013 at 8:38pm*

**physics**

A 21.0-g metal cylinder is placed on a turntable, with its center 85 cm from the turntable's center. The coefficient of static friction between the cylinder and the turntable's surface is ìs = 0.83. A thin, massless string of length 85 cm connects the center of ...
*Sunday, February 17, 2013 at 8:12pm*

**Physics**

An elevator's cable can handle a tension of 95,500N. Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg, what is the minimum time required for the elevator to rise 50.0 m from rest? 4.74 s 2.65 s 3.35 s 5.96 s
*Sunday, February 17, 2013 at 6:20pm*

**Chemistry/Physics**

I'm not sure how to do this. Determine the actual ratio of 18O:16O for the following substances. a) Snow falling in Greenland at a temperature of -20 degrees C b) Water vapor in equilibrium with VSMOW c) Pore-water from sediments in the North Atlantic corresponding to the ...
*Sunday, February 17, 2013 at 6:09pm*

**Physics**

An elevator's cable can handle a tension of 95,500N. Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg, what is the minimum time required for the elevator to rise 50.0 m from rest?
*Sunday, February 17, 2013 at 4:50pm*

**Physics**

A block of mass 3 kg is at rest on an incline. The coefficient of state friction between the block and incline is 0.34. What is the maximum angle of the incline such that the block will not slide down the plane?
*Sunday, February 17, 2013 at 4:35pm*

**Physics **

What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10-11 N m2/kg2)
*Sunday, February 17, 2013 at 4:34pm*

**physics**

Romeo takes a uniform 13.7-m ladder and leans it against the smooth (frictionless) wall of the Capulet residence. The ladder's mass is 23.2 kg and the bottom rests on the ground 3.43 m from the wall. When Romeo, whose mass is 70 kg, gets 88.3 percent of the way to the top...
*Sunday, February 17, 2013 at 4:23pm*

**Quantum Physics**

Suppose we have two qubits in the state α|00⟩+β|11⟩. (a) If we measure the fi rst qubit in the sign basis, what is the probability of seeing a +? (b) What is the resulting state of the second qubit in that case?
*Sunday, February 17, 2013 at 4:18pm*

**Physics**

A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...
*Sunday, February 17, 2013 at 4:11pm*

**Quantum Physics**

Suppose that a qubit is in the state |ψ> = a |0> + √ (1-a^2)|1> where a [-1,1] . If we first perform a standard basis measurement on this qubit and then perform a |u>, |u⊥> -basis measurement where |u> = b |0> + √ (1-b^2)|1> for ...
*Sunday, February 17, 2013 at 3:38pm*

**Physics**

Work is done on an object of mass 2kg to increase its kenetic energy to 18J. Calculate the speed of the object.
*Sunday, February 17, 2013 at 1:43pm*

**Physics**

What is the inner product of 13√|0⟩+2√3√|1⟩ and |+⟩? Rewrite 13√|0⟩+2√3√|1⟩ in the sign basis.
*Sunday, February 17, 2013 at 1:30pm*

**Physics**

A two-qubit system was originally in the state 34|00⟩−5√4|01⟩+14|10⟩−14|11⟩, and then we measured the first qubit to be 0. Now, if we measure the second qubit in the standard basis, what is the probability that the outcome ...
*Sunday, February 17, 2013 at 1:29pm*

**Physics**

Suppose we have two qubits in the state α|00⟩+β|11⟩. (a) If we measure the first qubit in the sign basis, what is the probability of seeing a +? (b) What is the resulting state of the second qubit in that case? Use a and b to denote α and β ...
*Sunday, February 17, 2013 at 1:29pm*

**Physics**

Now note that the following becomes good approximations as θ→0: sinθ≈θ sin2(π4−θ)≈12ͨ2;c⋅θ (where c is some constant.) Use these approximations to estimate the probability of success of the two measurements...
*Sunday, February 17, 2013 at 1:28pm*

**Physics**

We have a qubit in the state |ϕ⟩=3√2|0⟩+12|1⟩, which we want to measure in the {cosθ|0⟩+sinθ|1⟩,sinθ|0⟩−cosθ|1⟩} basis. In order for the two possible outcomes to be ...
*Sunday, February 17, 2013 at 1:27pm*

**Physics**

A spring, (spring constant of 400 N/m) is displaced .75 m from its equilibrium position. An 8-kg mass is connected to the spring and it is allowed to oscillate horizontally with Simple Harmonic Motion. What is the Kinetic Energy of the mass?
*Sunday, February 17, 2013 at 1:03pm*

**physics**

the ends of a light string are tied to two hooks A and Bin are ceiling which 100 cm apart horizontally,so that the length of string of string between hooks is 140 cm.A 650 g of mass is then attached by a second length of string to a point C on the first.80 cm from A,and hanged...
*Sunday, February 17, 2013 at 12:25pm*

**Physics**

The Royal Gorge bridge over the Arkansas River is 310.0 m above the river. A 59.0-kg bungee jumper has an elastic cord with an unstressed length of 62.0 m attached to her feet. Assume that, like an ideal spring, the cord is massless and provides a linear restoring force when ...
*Sunday, February 17, 2013 at 12:03pm*

**physics**

A stone is thrown horizontally at 30.0 m/s from the top of a very tall cliff. (a) Calculate its horizontal position and vertical position at 2-s intervals for the first 10.0s. (b) Plot your positions from part (a) to scale. Then connect your points with a smooth curve to show ...
*Sunday, February 17, 2013 at 11:28am*

**Physics**

A small object of mass 2.60 g and charge -17 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?
*Sunday, February 17, 2013 at 10:48am*

**Physics**

Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C
*Sunday, February 17, 2013 at 10:39am*

**physics**

two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature at the junction and the rate of the ...
*Sunday, February 17, 2013 at 8:45am*

**physics**

two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature at the junction and the rate of the ...
*Sunday, February 17, 2013 at 8:41am*

**physics**

two slabs of thickness 10cm and 2ocm are made of rteel and copper respectively.they are in thermal contact with each oth.the far end of the steel is at 100 degrees celcius amd that of copper is at 0 degrees celcius.determine the temperature at the junction and the rate of the ...
*Sunday, February 17, 2013 at 8:40am*

**Science(applied physics)**

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.
*Sunday, February 17, 2013 at 6:20am*

**Science(applied physics)**

At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.
*Sunday, February 17, 2013 at 6:20am*

**Physics**

A science student is riding on a flatcar of a train travelling along a straight horizontal track at a constant speed of 10.0 m/s.The student throws a ball into the air along a path that he judges to make an initial angle of 60.0 degrees with the horizontal and to be in line ...
*Sunday, February 17, 2013 at 5:55am*

**physics**

A pendulum bob of mass 50g hangs in a steady state by athread from the roof of a car as it accelerates horizontally.the angle between the thread and the vertical is 10 degrees. Find the acceleration of the car.
*Sunday, February 17, 2013 at 5:03am*

**physics**

A pendulum bob of mass 50g hangs in a steady state by athread from the roof of a car as it accelerates horizontally.the angle between the thread and the vertical is 10 degrees. Find the acceleration of the car.
*Sunday, February 17, 2013 at 5:03am*

**Physics ~IMPULSE~**

a) A tennis racket a 450 N force on a 0.05 kg tennis ball over a 0.006 s time period. What is the impulse applied to the ball? b) A ball (0.5 kg) is thrown with a velocity of 15 m/s. A receiver catches the ball and brings it to rest is 0.02 s. a) What is the change in momentum...
*Saturday, February 16, 2013 at 11:14pm*

**Physics ~MOMENTUM~**

a) what is the momentum of a 4.6 kg baseball moving at 1.4 m/s? b) a child is running with a velocity of 4.5 m/s and has a momentum of 120 kgm/s. What is the child's mass? ~formula~ P=mv help please!!!
*Saturday, February 16, 2013 at 11:03pm*

**Physics**

A 100kg steel beam falls from rest from a height of 20m, Find its impact speed.
*Saturday, February 16, 2013 at 10:37pm*

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