Wednesday

October 22, 2014

October 22, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

A 8.5 dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.47 , relative to the water, and the canoe simultaneously moves in the opposite direction at 0.17 .What is the mass ...
*Thursday, November 22, 2012 at 11:41pm*

**Physics**

A 1.2 -long steel rod with a diameter of 0.50 hangs vertically from the ceiling. An auto engine weighing 4.7 is hung from the rod. By how much does the rod stretch?
*Thursday, November 22, 2012 at 11:40pm*

**Physics**

Sunlight strikes a piece of crown glass at an angle of incidence of 35.8 degrees. Calculate the difference in the angle of refraction between a red (660. nm) and a green (550. nm) ray within the glass. The indices of refraction for the red and the green are n = 1.520 and n = 1...
*Thursday, November 22, 2012 at 10:14pm*

**physics**

A flight attendant pulls her 74.2 N flight bag a distance of 324 m along a level airport floor at a constant velocity. The force she exerts is 37.9 N at an angle of 55.2 above the horizon- tal. a) Find the work she does on the flight bag. Answer in units of J 024 (part 2 ...
*Thursday, November 22, 2012 at 9:38pm*

**physics**

A 42.1 kg diver steps off a diving board and drops straight down into the water. The water provides an average net force of resistance of 1559 N to the diver’s fall. If the diver comes to rest 4.1 m below the water’s surface, what is the total distance be- tween the ...
*Thursday, November 22, 2012 at 9:32pm*

**Physics**

A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.
*Thursday, November 22, 2012 at 8:59pm*

**physics**

Calculate the speed of an 7.6×104 kg airliner with a kinetic energy of 1.2 × 109 J. Answer in units of m/s
*Thursday, November 22, 2012 at 8:40pm*

**Physics **

A refrigerator does 18kJ of work while moving 115 kJ of thermal enegy from inside the refrigerator. What is its coefficient of performance?
*Thursday, November 22, 2012 at 6:35pm*

**Physics**

An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?
*Thursday, November 22, 2012 at 6:34pm*

**Physics**

A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.
*Thursday, November 22, 2012 at 6:33pm*

**physics**

a ray of light in air enters a glass surface at right angles to the surface. what is the angle of refraction
*Thursday, November 22, 2012 at 6:01pm*

**Physics**

A load of 59 N attached to a spring hanging vertically stretches the spring 5 cm. The spring is now placed horizontally on a table and stretched 14 cm. What force is required to stretch it by this amount?
*Thursday, November 22, 2012 at 3:19pm*

**physics**

A 2 kg object is released from rest from a height of 10 m above the ground. Calculate 1) the initial potential energy at the moment of release; 2) the kinetic energy at the moment it reaches 4 m above the ground 3) After the impact the object just before Impact with the ground
*Thursday, November 22, 2012 at 11:32am*

**physics**

a 10.0 cm cylindrical chamber has a 5.0cm diameter piston attached to one end. The piston is connected to an ideal spring with a spring constant of 10.0N/cm. Initially, the spring is not compressed but is latched in place so that it cannot move. When the cylinder is filled ...
*Thursday, November 22, 2012 at 9:31am*

**physics**

A pile driver of mass 1000kg,hits a post 3m below it.It moves the post 10mm.Assuming gravity=10m/s,what is the kinetic energy of the pile driver?
*Thursday, November 22, 2012 at 8:27am*

**Physics. Free electron density, please help!**

A length of wire has a radius of 3.00 × 10-3 m and a resistance of 0.200 Ω. When the potential difference across the wire is 10.0 V, the electron drift speed is found to be 2.98 × 10-4 m/s. On the basis of these data, calculate the density of free electrons in...
*Wednesday, November 21, 2012 at 11:38pm*

**physics**

The range of human hearing extends from approxmately 20 HZ to 20 000 HZ. Find the wavelenghts of these extremes when the speed of sound in air is equal to 343 m/s. A dolphin is 25 degrees C sea water emits a sound directed toward the bottom of the ocean 150 m below. How much ...
*Wednesday, November 21, 2012 at 9:56pm*

**Physics**

A car traveling at constant speed safely negotiates a frictionless banked curved. Calculate the speed of the car when the road is banked at 20 degrees and the radius of its path is 50 meters. (HINT - Do not rotate your axes) Answer v=13.35 m/s
*Wednesday, November 21, 2012 at 8:46pm*

**Physics**

The two blocks in the figure below, m1 = 1.2 kg and m2 = 4.8, are connected by a massless rope that passes over a pulley. The pulley is 12 cm in diameter and has a mass of 2.0 kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.38 N·m. If the ...
*Wednesday, November 21, 2012 at 8:36pm*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*Wednesday, November 21, 2012 at 8:23pm*

**Physics**

A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.
*Wednesday, November 21, 2012 at 6:58pm*

**Physics**

An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
*Wednesday, November 21, 2012 at 6:57pm*

**university physics**

Derive absolute error in equations: 1)Derive absolute error in (e/m) e/m= 2V/B^2*R^2 2)Derive absolute error in B B=8uN(Inet)/square root 125a
*Wednesday, November 21, 2012 at 2:45pm*

**Physics**

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.85 105 Pa and the pipe radius is 2.80 cm. At the higher point located at y = 2.50 m, the pressure is 1.28 105 Pa and the pipe radius is 1.20 cm. (a) ...
*Wednesday, November 21, 2012 at 12:35pm*

**Physics**

Bats can detect small insects that are about equal in size to the wavelength of the sound the bat makes with its echolocation system. A bat emits chirps at a frequency of 17.7kHz. Using the speed of sound as 340m/s, what is the smallest insect the bat can detect?
*Wednesday, November 21, 2012 at 11:48am*

**Physics**

A traveling wave has displacement D(x,t)=(3.00cm)sin(5.36x-6.71t), where x is in meters and t is in seconds. What is the wave speed of this wave? **snapshot graph at t=1/4 s
*Wednesday, November 21, 2012 at 11:44am*

**Physics**

A hammer taps on the end of a 8.13m long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 10.00ms. What is the ...
*Wednesday, November 21, 2012 at 11:42am*

**Physics HELP!!**

a). What is the wavelengh of a 2.54MHz ultrasound wave travelling through aluminum?(the speed of sound in aluminum is 6420 m/s) b). What frequency of electromagnetic wave would have the same wavelength as the ultrasound wave above?
*Wednesday, November 21, 2012 at 11:41am*

**Physics**

For a certain transverse wave, the distance between two successive crests is 4.48m, and 13 crests pass a given point along the direction of travel every 5.97s. Calculate the wave speed!
*Wednesday, November 21, 2012 at 11:40am*

**Physics HELP!!**

Earthquakes are essentially sound waves travelling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse sismic waves, which travel at different speeds. The speed of longitudinal waves, called P waves, is ...
*Wednesday, November 21, 2012 at 11:39am*

**Physics**

A bullet with a mass of 10 imbeds itself in a wooden block of mass 3990g and is free to move. If the speed of the block and bullet together is 50 cm/s just after the impact what was the original speed of the bullet ? what was the right formula to use.? pls anwer me.
*Wednesday, November 21, 2012 at 9:17am*

**Physics**

A bullet with a mass of 10 imbeds itself in a wooden block of mass 3990g and is free to move. If the speed of the block and bullet together is 50 cm/s just after the impact what was the original speed of the bullet ?
*Wednesday, November 21, 2012 at 8:25am*

**Physics**

A soccer player kicks a football frombground level with an initial velocity of 27.0m/s, 30deg. Solve for the: A. Ball's hang time B. Range C. Max Height Ignore air resistance. (Hint: hang time refers to the time the ball is in the air.)
*Wednesday, November 21, 2012 at 8:06am*

**Physics**

A 1.9 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.13 m, and the height of the room is 3.00 m. (a) What is the gravitational potential energy associated with the ball relative to the ceiling? J (b) What is the ...
*Wednesday, November 21, 2012 at 12:49am*

**Physics A**

how much work is being done a bookshelf being pulled 5 meters at an angle of 37 degrees from the horizontal? The magnitude of the component of the force that does the work is 43 Newtons
*Wednesday, November 21, 2012 at 12:09am*

**Physics**

he graph of the velocity of a mass attached to a horizontal spring on a horizontal frictionless surface as a function of time is shown below. The numerical value of V is 5.48 m/s, and the numerical value of t0 is 8.97 s. a) What is the amplitude of the motion in m? b) What is ...
*Tuesday, November 20, 2012 at 11:47pm*

**Physics**

The Colliding Balls: A ball is released from rest at a height h above the ground. The ball collides with the ground and bounces up at 75% of the impact speed the ball had with the ground. The collision with the ground is nearly instantaneously. A second ball is released above ...
*Tuesday, November 20, 2012 at 10:43pm*

**Physics**

Two Peaches, Two Seconds, One Roof: A peach is thrown straight up from the edge of the roof of a building. A second peach is dropped from the roof 2s later. a. If the height of the building is 60m what must the initial speed of the first peach be if both are to hit the ground ...
*Tuesday, November 20, 2012 at 10:43pm*

**Physics**

The Alert Hiker: An alert hiker sees a boulder fall from the top of a distant cliff and notes that it takes 1.3s for the boulder to fall the last third of the way to the ground. a.What is the height of the cliff in meters? b.If in part (a) you get two solutions of a quadratic ...
*Tuesday, November 20, 2012 at 10:42pm*

**Physics**

The Falling Paint Can: A painter is standing on scaffolding that is raised at a constant speed vi. As he travels upward he accidentally nudges a paint can off the scaffolding and it falls 15m to the ground. You are watching and measure with your stopwatch that it takes 3.25s ...
*Tuesday, November 20, 2012 at 10:41pm*

**Physics**

The Spent Rocket Parts: During launches, rockets often discard parts. A certain rocket starts from rest on the launch pad and accelerates upward at a steady 3.3 m/s2. When it is 235 m above the launch pad, the rocket discards a used fuel canister by simply disconnecting it. ...
*Tuesday, November 20, 2012 at 10:40pm*

**Physics**

The Flower Pot: A flower pot falls off a windowsill and falls past the window below. It takes .3 s to travel from the top of the window to the bottom of the window which is 2.2 m tall. From what height above the top of the window did the flower pot fall?
*Tuesday, November 20, 2012 at 10:39pm*

**physics**

A 4.00 kg mass and a 3.00 kg mass are attached to opposite ends of a thin 32.2 cm long horizontal rod. The system is rotating at angular speed omega = 4.70 rad/s about a vertical axle at the center of the rod. Determine the kinetic energy K of the system.
*Tuesday, November 20, 2012 at 10:11pm*

**physics**

A train travels at a constant speed around a curve of radius 225 m. A ceiling lamp at the end of a light cord swings out to an angle of 20.0º throughout the turn. Draw a free body diagram? What is the speed of the train?
*Tuesday, November 20, 2012 at 8:23pm*

**Physics **

A ball player hits a home run, and the baseball just clears a wall 17.0 m high located 127.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the ground. (a) What is...
*Tuesday, November 20, 2012 at 7:38pm*

**physics**

a 100N force is applied at an angle of 30 degrees horizontal to move a 15kg object at a constant speed for a horizontal distance of 5m what would the work be
*Tuesday, November 20, 2012 at 7:31pm*

**Physics**

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.85 105 Pa and the pipe radius is 2.80 cm. At the higher point located at y = 2.50 m, the pressure is 1.28 105 Pa and the pipe radius is 1.20 cm. (a) ...
*Tuesday, November 20, 2012 at 5:45pm*

**Physics**

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.85x10^5 Pa and the pipe radius is 2.80 cm. At the higher point located at y = 2.50 m, the pressure is 1.28X10^5 Pa and the pipe radius is 1.20 cm. (a) ...
*Tuesday, November 20, 2012 at 5:34pm*

**physics**

A balloon with a radius of 20.0 m at 6.0 oC is heated to 32.0oC. Find the new volume.
*Tuesday, November 20, 2012 at 4:26pm*

**physics **

A snapshot graph of a travelling wave is shown. The wave is travelling to the right at 10.4m/s. What is the amplitude if the maximum displacement is 26.6cm and the total distance travelled by the wave is 18.4m?
*Tuesday, November 20, 2012 at 4:17pm*

**Physics**

An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the average power in watts he expends climbing the hill?
*Tuesday, November 20, 2012 at 4:00pm*

**Physics**

A person pulls a crate with 120 N of force against 100 N of friction a distance of 5 meters. Find the energy the person expends pulling the crate, the amount of energy converted to heat via friction, and the increase in the kinetic energy of the crate.
*Tuesday, November 20, 2012 at 4:00pm*

**Physics**

A box of mass 4 kg is resting on a table 1.5 m above the floor. There is also a ledge located 5 m above the floor. Find the gravitational potential energy of the box relative to the floor, and the gravitational potential energy of the box relative to the ledge.
*Tuesday, November 20, 2012 at 3:59pm*

**Physics**

A standing wave has wavenumber 200 rad/m. What is the distance between two adjacent nodes.
*Tuesday, November 20, 2012 at 3:30pm*

**physics**

A standing wave has a wavenumber 200 rad/m. What is the distance between two adjacent nodes?
*Tuesday, November 20, 2012 at 3:19pm*

**physics**

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower?
*Tuesday, November 20, 2012 at 3:04pm*

**physics**

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower?
*Tuesday, November 20, 2012 at 2:58pm*

**physics**

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower?
*Tuesday, November 20, 2012 at 2:58pm*

**physics**

Jessie exerted a force of 400N to move a box across the floor to a distance of5m in 4sec. What is his power is kilowatts? Megawatts? Horsepower?
*Tuesday, November 20, 2012 at 2:57pm*

**physics**

An object of mass m = 5 kg is suspended by three cables as shown in the figure. If the tension T2 in the horizontal cable is 12 N: 1) What is the angle ƒáƒn that the left cable makes with the horizontal?
*Tuesday, November 20, 2012 at 2:27pm*

**physics**

A 4.0-kg block is stacked on top of a 12.0-kg block, which is accelerating along a horizontal table at a = 5.2m/s2 . Let u=uk=us. (a) What minimum coefficient of friction u between the two blocks will prevent the 4.0-kg block from sliding off? (b) If u is only half this ...
*Tuesday, November 20, 2012 at 2:12pm*

**university physics**

A mass m1 = 7.65 kg, is at rest on a frictionless horizontal surface and connected to a wall by a spring with k = 67.9 N/m, as shown in the figure. A second mass, m2 = 5.29 kg, is moving to the right at v0 = 15.3 m/s. The two masses collide and stick together. the figure is ...
*Tuesday, November 20, 2012 at 2:09pm*

**physics**

The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?
*Tuesday, November 20, 2012 at 1:41pm*

**physics**

What mass on a spring with a spring constant of 120 N/m will oscillate with a period of 1.0 s?
*Tuesday, November 20, 2012 at 1:41pm*

**physics**

A force of 85 N is required to compress the spring by 0.0200 m. How much force is needed to compress the spring by 0.0600 N? 3.
*Tuesday, November 20, 2012 at 1:40pm*

**physics**

A 4.5-kg block is hung from a spring causing the spring to elongate 12 cm. With what period will the spring oscillate if the spring was stretched 15 cm and released?
*Tuesday, November 20, 2012 at 1:39pm*

**Physics**

A box is being pushed to the left parallel to the x-axis by a force of 23.0 N. A rope provides a second force of 33.8 N on the box, directed to the right at an angle of 39.0 deg. from the x-axis. What is the magnitude of the net force acting on the box ?
*Tuesday, November 20, 2012 at 1:21pm*

**university physics**

A platinum resistance thermometer has resistances of 200.0 ohms when placed in a 0 degrees Celsius ice bath and 253.8 ohms when immersed in a crucible contacting melting potassium. What is the melting point of potassium? Hint: First determine the resistance of the platinum ...
*Tuesday, November 20, 2012 at 1:06pm*

**Physics**

A ball is thrown straight up in the air at an initial speed of 30 m/s. Using conservation of energy, find the maximum height of the ball.
*Tuesday, November 20, 2012 at 11:19am*

**PHYSICS**

The cutting tool on a lathe is given two displacements, one of magnitude 4 cm and one of magnitude 3 cm, in each one of five situations (a) through (e) diagrammed in the figure below. Rank these situations according to the magnitude of the total displacement of the tool, ...
*Tuesday, November 20, 2012 at 8:22am*

**PHYSICS**

while exploring a cave, a spelunker starts at the entrance and moves the following distances in a horizontal plane. she goes 75.0 m north, 250 m east, 125 m at an angle theta equal to 30.0 north of east, and 150 m south. find her resultant displacement from the cave entrance.
*Tuesday, November 20, 2012 at 7:22am*

**physics**

a uniform rod of mass M is hinged at its upper end. A particle of mass m moving horizontally strikes the rod at its midpoint elastically. If the particle comes to rest after collision find the value of M/m
*Tuesday, November 20, 2012 at 7:07am*

**Physics. Error equations. Please help!**

These two equations concern a lab on the measurement of E/M by the Brainbridge Method. I need to derive the absolute error for two different equations, the first one is: e/m = 2V/B2R2 treat (e/m) as a SINGLE VARIABLE when doing the derivation. The second is B=8μ0N(I-Io...
*Tuesday, November 20, 2012 at 12:03am*

**Physics**

A plane drops a hamper of medical supplies from a height of 2960m during a practice run over the ocean. The planes horizontal velocity was 108m/s at the instant the hamper was dropped. What is the magnitude of the overall velocity at the hamper at the instant it strikes the ...
*Monday, November 19, 2012 at 11:52pm*

**Physics**

In a very busy off-campus eatery one chef sends a 241-g broccoli-tomato-pickle-onion-mushroom pizza sliding down the counter from left to right at 1.53 m/s. Almost simultaneously, the other chef launches a 321-g veggieburger-on-a-bun (with everything, but hold the horseradish...
*Monday, November 19, 2012 at 11:03pm*

**Physics**

During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 148-g baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 10.1 m/s, shatters the glass as it passes through, and leaves the window ...
*Monday, November 19, 2012 at 11:02pm*

**Physics**

A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...
*Monday, November 19, 2012 at 10:55pm*

**Physics**

A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...
*Monday, November 19, 2012 at 10:46pm*

**Physics**

When a gun (3 kg) shoots a bullet (.025 kg), the bullet goes forward and the gun recoils backward. Which of the following statements is true? Select one: a. The force pushing the gun backwards is smaller than the force pushing the bullet forward. b. Both objects accelerate at ...
*Monday, November 19, 2012 at 10:23pm*

**Physics**

A 10 kg block is placed on a ramp. The ramp has a 20 degree angle above the horizontal. What force of friction is needed to keep the block at rest?
*Monday, November 19, 2012 at 10:21pm*

**physics**

An open train car, with a mass of 2070 kg, coasts along a horizontal track at the speed 2.31 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 3.25 s at the rate of 491 kg/s. What is the car's speed after the loading is ...
*Monday, November 19, 2012 at 10:01pm*

**Physics **

A thrill-seeking cat with mass 4.00 kg is attached by a harness to an ideal spring of negligible mass and oscillates vertically in SHM. The amplitude is 0.050 m, and at the highest point of the motion the spring has its natural unstretched length. Calculate the elastic ...
*Monday, November 19, 2012 at 9:59pm*

**Physics HARD**

If an objects vbr is 6.32N/sc what is its mass? I'm so stuck...:((((
*Monday, November 19, 2012 at 9:53pm*

**Physics**

A cat chases a mouse across a 1.1 m high table. The mouse steps out of the way, and the cat slides oﬀ the table and strikes the ﬂoor 2.2 m from the edge of the table. The acceleration of gravity is 9.81m/s^2. What was the cat’s speed when it slid oﬀ ...
*Monday, November 19, 2012 at 9:33pm*

**Physics**

Sukey is riding her bicycle when she sees a fallen tree 42 m ahead. If the coefficient of friction is .36 and she is travelling at 50 km/ hr and she and the bike have a mass of 95 kg, how much stopping distance does she need. I got as far as her speed equals 13.9 m/sec. Do we ...
*Monday, November 19, 2012 at 9:32pm*

**Physics**

A plane drops a hamper of medical supplies from a height of 2960m during a practice run over the ocean. The planes horizontal velocity was 108m/s at the instant the hamper was dropped. What is the magnitude of the overall velocity at the hamper at the instant it strikes the ...
*Monday, November 19, 2012 at 9:28pm*

**Physics**

During a baseball game, a batter hits a pop up to a fielder 65m away. The acceleration of gravity is 9.8m/s^2. If the ball remains in the air for 5.7s, how high does it rise? Answer in units of m.
*Monday, November 19, 2012 at 9:24pm*

**physics**

A ball is thrown horizontally from the top of a building 17.6 m high. The ball strikes the ground at a point 67.7 m from the base of the building. The acceleration of gravity is 9.8 m/s^2 1. Find the time the ball is in motion. Answer in units of s. 2. Find the initial ...
*Monday, November 19, 2012 at 9:14pm*

**physics**

A ball is thrown horizontally from the top of a building 17.6 m high. The ball strikes the ground at a point 67.7 m from the base of the building. The acceleration of gravity is 9.8 m/s^2 Find the time the ball is in motion. Answer in units of s
*Monday, November 19, 2012 at 9:11pm*

**physics**

A catapult gives a rock a vertical velocity of 122m/s. a. Determine the time the rock is in the air. b. Determine the maximum height the rock would reach. c. As the rock leaves the catapult the rock also has a horizontal velocity of 34m/s. solve for the rocks range. d. Solve ...
*Monday, November 19, 2012 at 9:01pm*

**Physics**

A man jumps straight up at 5m/s. a. Determine the time the man is in the air. b. Determine the maximum height the man would reach. c. As he jumps, a jerk pushes him in the back, giving him a velocity of 12m/s. determine the range of the man. d. Solve for the resultant velocity...
*Monday, November 19, 2012 at 8:59pm*

**Physics**

Football is kicked up into the air with a velocity of 20m/s. a. Determine the time the football is in the air. b. Determine the maximum height the football would reach. c. As the ball is kicked it encounters a weird horizontal wind that gives it a velocity of 5m/s. Determine ...
*Monday, November 19, 2012 at 8:58pm*

**Physics**

A plane drops a bomb from an altitude of 10,000m. a. Determine the time the bomb is in the air. b. Determine the velocity the bomb would have right before it hits the ground. c. Before the bomb is launched the plane has a horizontal velocity of 92m/s. Determine the distance ...
*Monday, November 19, 2012 at 8:53pm*

**Physics**

A helicopter drops a box from 120m in the air. a. Determine the time the box is in the air. b. Determine the velocity the box would have right before it hits the ground. c. Before the box falls the helicopter had a horizontal velocity of 55/s. Determine the distance the box ...
*Monday, November 19, 2012 at 8:49pm*

**Physics**

Two objects are connected by a string with a mass less, friction less pulley. The coefficient of friction is .298. The block on the table is 4 kg. What must the mass of the hanging block be so that the block on the table will move with a constant speed?
*Monday, November 19, 2012 at 7:39pm*

**Physics**

A 1.1 kg lizard lies on a flat rock tilted. A person decides to tilt the rock hoping that the lizard falls off. The rock is tilted at an angle of 15 degrees with respect to the horizontal. The coefficient between the rock and the lizard is .16. What is the acceleration of the ...
*Monday, November 19, 2012 at 7:34pm*

**Physics**

A certain spring has a spring constant of 165 N/m. A 20kg mass is attached to the end of the spring. While the mass is at the equilibrium position, it is given a velocity of 8m/s downward. What is the total energy of the system, and aacceleration of the system when it is at ...
*Monday, November 19, 2012 at 7:33pm*

**Physics**

A 4.29 kg block starts from rest at the top of a 31.8 degrees incline and slides 2.22 m down the incline in 1.22 s. The acceleration of gravity is 9.8 m/s^2. What is the acceleration of the block? Answer in units of m/s^2 What is the coeﬃcient of kinetic friction ...
*Monday, November 19, 2012 at 7:32pm*

**Physics**

A sled is pulled across a horizontal snow surface with a constant velocity. The force being applied is 80 N at an angle of 53 degrees to the ground. What is the magnitude of the force of friction of the snow acting on the sled?
*Monday, November 19, 2012 at 7:27pm*

**physics university**

A 10C charge is positioned at x=0m, a -5C charge is positioned at x=0.06m and a 2C charge is at 0.09m. What is the net force on the -5C charge? answer is (Fnet = -2.5x1013 N)
*Monday, November 19, 2012 at 7:19pm*

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