Thursday

August 25, 2016
**physics**

Chapter 02, Problem 09 A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.04 m/s. The car is a distance d away. The bear is 28.8 m behind the tourist and running at 7.26 m/s. The tourist reaches the car safely. What is the ...
*Wednesday, December 16, 2015 by trish*

**physics**

A box is sliding up an incline that makes an angle of 21.8° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.170. The initial speed of the box at the bottom of the incline is 3.48 m/s. How far does the ...
*Wednesday, December 16, 2015 by trish*

**physics**

Three deer, A, B, and C, are grazing in a field. Deer B is located 61.0 m from deer A at an angle of 54.1 ° north of west. Deer C is located 79.8 ° north of east relative to deer A. The distance between deer B and C is 98.1 m. What is the distance between deer A and C?
*Wednesday, December 16, 2015 by trish*

**physics**

A 15.7-g bullet is fired from a rifle. It takes 3.00 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 779 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
*Wednesday, December 16, 2015 by trish*

**Physics Sound Waves**

A fire truck emitting a 450 Hz signal passes by a stationary detector. The difference in frequency measured by the detector is 58 Hz. If the speed of sound is 345 m/s, how fast is the fire truck moving? The answer should be 22 m/s but I don't even know where to start. ...
*Wednesday, December 16, 2015 by R*

**physics**

A box is sliding up an incline that makes an angle of 21.8° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.170. The initial speed of the box at the bottom of the incline is 3.48 m/s. How far does the ...
*Wednesday, December 16, 2015 by trish*

**Physics**

Three people are pulling on a tree. The first person pulls with 16N at 64.0 degrees. The second person pulls with 15 N at 136 degrees. The 3rd person pulls with 12 N at 195 degrees. What is the magnitude and direction of the resultant force on the three?
*Wednesday, December 16, 2015 by Gtueyb*

**Physics **

Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 44 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall. Answer in units of m/s2.
*Wednesday, December 16, 2015 by Lily *

**Physics**

Why we have to know refractive index and can use this in normal life?
*Wednesday, December 16, 2015 by Akhter*

**Physics**

A tugboat pulls a ship with a constant horizontal force of 6000N and causes the ship to move through a harbor. The water exerts a constant drag force on the ship of 500N. How much work is done on the ship if it moves a distance of 4.0 km? Force is causing parallel displacement...
*Wednesday, December 16, 2015 by Felix*

**physics**

a car which weight is 1000N is travelling at 90kmn/hr and come to rest in a distance of 50m after applying the brakes. assume uniform acceleration, calculate how large its stopping force was exerted by the friction between the wheel and the road.
*Wednesday, December 16, 2015 by samuel*

**Physics **

An 8.0g bullet is fired into a 2.5 Kg block at rest at the edge of a friction-less table of height 1.0 m. The bullet remains in the block and after the impact the block lands (d) distance from the bottom of the table. Find the initial speed of the bullet. Now I do realize this...
*Tuesday, December 15, 2015 by Aziz*

**Physics**

Compute the initial upward acceleration of a rocket of mass 1.5 ✕ 104 kg if the initial upward force produced by its engine (the thrust) is 2.7 ✕ 105 N. Do not neglect the weight of the rocket. Pleas tell me the steps, I've tried getting the acceleration and ...
*Tuesday, December 15, 2015 by Will*

**physics**

An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is the object's velocity when its potential energy is 2/3E? the ...
*Tuesday, December 15, 2015 by anna*

**physics**

3. Only two forces act on an object. The magnitude of the first force is 25 N and it acts at an angle of +25° with the positive x-axis. The second force acts at angle of -73° with the positive x-axis. The acceleration of the object is parallel to the positive x-axis. ...
*Tuesday, December 15, 2015 by rebecca*

**Physics**

A spring with a force constant of 1.0 N/cm is compressed to a displacement of 10.0 cm. When released, it's energy is used to rotate a mass of 0.50 kg, secured by a spring, around in a circle with radius of 0.75 m, starting at the top of the circle. After 0.3 s has elapsed...
*Tuesday, December 15, 2015 by Laura*

**Physics**

A spring with a force constant of 1.0 N/cm is compressed to a displacement of 10.0 cm. When released, it's energy is used to rotate a mass of 0.50 kg, secured by a spring, around in a circle with radius of 0.75 m, starting at the top of the circle. After 0.3 s has elapsed...
*Tuesday, December 15, 2015 by Laura*

**physics**

a bullet of mass0.01 kg is fired into a sandbag of mass 0.49kg hanging from a tree. the sandbag with the bullet embedded into it, swings away at 10m/s. find momentum after
*Tuesday, December 15, 2015 by Sipara*

**Physics**

A gymnast on a high bar swings through two revolutions in a time of 1.90s. Find the angular velocity of the gymnast
*Tuesday, December 15, 2015 by Anonymous*

**Physics**

A child on a sled is sliding at a speed of 4m/s across level ice. if the total mass of the sled + child is 50kg and the sled has steel runners, how long will it take the sled to come to a halt? what force will be required to start it moving again? If this force continues to be...
*Tuesday, December 15, 2015 by Roisin*

**physics**

a place kicker kick a ball 36m from a goal .which is 3.05 m high.it leaves the ground 20 m/s at an angle 53 to the horizontal.how much the ball clear or fall short of clearing the bar
*Tuesday, December 15, 2015 by geof*

**PHYSICS**

To see how two traveling waves of the same frequency create a standing wave. Consider a traveling wave described by the formula y1(x,t)=Asin(kx−ωt). This function might represent the lateral displacement of a string, a local electric field, the position of the ...
*Tuesday, December 15, 2015 by SENDICA*

**physics**

A projectile is launched at ground level with an initial speed of 56.0 m/s at an angle of 35.0° above the horizontal. It strikes a target above the ground 2.90 seconds later. What are the x and y distances from where the projectile was launched to where it lands?
*Tuesday, December 15, 2015 by tjjjj*

**Physics**

A 56.5kg, 2.4m uniform ladder leans against a frictionless wall. A 95.5kg person is standing up 0.8m from the bottom of the ladder. The ladder makes an angle of 57 degrees with the horizontal. The coefficient of static friction between th eladder and the ground is 0.15. What ...
*Monday, December 14, 2015 by James *

**physics**

Practice Problem 13.9 Let's begin by looking at a flow problem in which the diameter of a pipe changes along the flow path. We will need to use both the continuity equation and Bernoulli's equation for this problem. Water enters a house through a pipe with an inside ...
*Monday, December 14, 2015 by lost*

**Physics**

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 290 km/h in a semicircular arc with a radius of 200 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant tangential acceleration. ...
*Monday, December 14, 2015 by asher*

**Physics**

As part of a challenge lab, a student determines that a spring powered marble cannon will fire a 0.03kg marble to a maximum height of 0.8m when the cannon is set to the second medium firing position and fired vertically A. If setting the medium firing position requires that ...
*Monday, December 14, 2015 by V*

**Physics**

The spring in a spring loaded cannon has a spring constant of 470N/m. A 0.05kg ball bearing is loaded into the cannon and the spring is compressed 0.1m. What will be the velocity of the ball bearing the instant before it hits the ground if the cannon s fired horizontally off ...
*Monday, December 14, 2015 by V*

**Physics**

What is the minimum speed you would need to roll a lacrosse ball down a flat street for it to be able to roll over a speed bump with a height of 12 cm
*Monday, December 14, 2015 by V*

**Physics**

_________________________________________________________________ You find yourself on your bike at the top of Twin Peaks in San Francisco. You are facing a 600m descent. You and your bike weigh a combined 85 kg. 1. How much gravitational potential energy do you have ...
*Monday, December 14, 2015 by V*

**Physics**

Just before your mountain bike ride, you eat a 240 Calorie exercise bar. (You can find the conversion between food Calories and Joules in the People’s Physics chapter and several references online.) The carbon bonds in the food are broken down in your stomach, releasing ...
*Monday, December 14, 2015 by V*

**physics**

A 1.22 kg skateboard is coasting along the pavement at a speed of 5.84 m/s when a 1.20 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination?
*Monday, December 14, 2015 by Jake*

**physics**

A ball is thrown directly upward at 19.6 m/s how much time passes before the ball reaches the top of its motion
*Monday, December 14, 2015 by a.a*

**physics**

A rock is dropped from the top of a tall bridge after 3 seconds how far has the rock fallen due to gravity
*Monday, December 14, 2015 by a.a*

**Physics**

A car and a truck starts from rest at the same instant, with the car initially at some distant behind the truck. The truck has a constant acceleration of 2.1 m/s^2, and the car at 3.4 m/s^2. The car overtakes the ruck after it has moved 40.0 m. a) how much time does it take ...
*Monday, December 14, 2015 by April Catubig*

**Physics Part A HELP!!**

4.) In coming to a stop, a car leaves skid marks 80m long on the highway. Assuming a DEceleration of 7.00 m/s^2 (m/s/s), estimate the speed of the car just before breaking. 6.) A car traveling @ 90km/h strikes a tree. The front end of the car compresses and the driver comes to...
*Monday, December 14, 2015 by Jess*

**Physics**

A roller coaster cart of mass m = 293 kg starts stationary at point A, where h1 = 23.3 m and a while later is at B, where h2 = 8.4 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the cart at B, ignoring the effect of friction?
*Monday, December 14, 2015 by George*

**physics**

A uniform meter stick of mass 30 g is used to suspend three objects as follows: 20 g at 0.01 m, 30 g at 0.42 m and 35 g at 0.9 m. Where could you place your finger to balance the stick in the horizontal position?
*Monday, December 14, 2015 by CO*

**physics **

An Olympic high jumper starts running. As she approaches the bar, she pushes off the ground and lifts her body off the ground and flies over the bar. She then falls down into a large padding on the ground. Describe the energy transformation: The _________ energy in food that ...
*Monday, December 14, 2015 by Edith De Bonilla*

**Physics **

The curve y = 11x - 24 - x^2 cuts the x-axis at points A and B, and PN is the greatest positive value of the y coordinate. Show that 2 PN • AB equals three times the area bounded by that portion of the curve which lies in the first quadrant. Kinda confused on how to do this
*Monday, December 14, 2015 by Pip Paladins*

**Calculus, Physics**

The curve y = 11x - 24 - x^2 cuts the x-axis at points A and B, and PN is the greatest positive value of the y coordinate. Show that 2 PN • AB equals three times the area bounded by that portion of the curve which lies in the first quadrant. Kinda confused on how to do this
*Monday, December 14, 2015 by Pip Paladins*

**physics**

determine the energy stored in a 2m long wire of cross sectional area 0.5mm^2 kf the force of 50N is applied to it.
*Monday, December 14, 2015 by jay*

**Physics**

In the bloodstream, an erythrocyte (red blood cell) of mass m moves with velocity v to the right. Ir collides head-on with a leukocyte (white blood cell) of twice its mass moving to the left with three times its speed. After the collision, the became stuck together. What would...
*Monday, December 14, 2015 by Eric*

**Physics**

A spring with k=1400N/m is firmly anchored to the bottom of a swimming pool. A diver in full SCUBA gear with total mass of 100kg and density of 0.65g/cm3 holds on to the top of the spring. The system reaches a new static equilibrium. After the print is elongated by a length ...
*Monday, December 14, 2015 by Eric*

**Physics**

A certain mass of water at the top of Niagara Falls has a temperature of +10.0 degrees Celsius. It falls a distance of 50m. Assuming that all its potential energy is converted into thermal energy, calculate the temperature of the mass of water at the bottom of the falls.
*Monday, December 14, 2015 by Josée*

**Physics**

An astronaut on board a spacecraft is in orbit around the earth in uniform circular motion. Is her velocity speed and acceleration constant?
*Monday, December 14, 2015 by Haylee*

**Physics**

the top sprinter in the world can reach a terminal speed of 50km/h, in 20m. Assuming the acceleration to be constant, compute the acceleration such an individual experiences, and compare it (in percentage form) to the acceleration of gravity.
*Monday, December 14, 2015 by Haylee*

**Physics**

In the hydrogen atom, the distance between the electron and the proton is 5x10^-11m. a)Compute the magnitude of the gravitational force FG between the electron and the proton b)Compute the magnitude of the electrical force FE between the electron and the proton c)How many ...
*Monday, December 14, 2015 by Val*

**Physics**

A standard man uses crutches. The crutches each make an angle of 25 degrees with the vertical. Half the standard man's weight is supported by the crutches; Assuming the standard man is motionless, find the magnitude of the force supported by each crutch.
*Monday, December 14, 2015 by Irma*

**PHYSICS**

If there is no dark matter, in order to explain our observations, our concepts of an important building block of the universe have to be incorrect. What is that building block and why do Astronomers overwhelmingly favor dark matter, which they cannot see, to explain our ...
*Monday, December 14, 2015 by AJ*

**Physics Help**

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy. Am I correct?
*Sunday, December 13, 2015 by George*

**Physics **

A tennis ball initially moves with a velocity of 27.0 m/s horizontally to the right. A tennis racket strikes the ball, giving it a velocity of 27.0 m/s to the left. Treat the collision as elastic and the ball and racket as particles of mass 0.0580 kg and 0.272 kg respectively...
*Sunday, December 13, 2015 by Physics idiot*

**Physics **

A missile of mass 1.20 102 kg is fired from a plane of mass 5.10 103 kg initially moving at a speed of 3.35 102 m/s. If the speed of the missile relative to the plane is 1.21 103 m/s, what is the final velocity of the plane? HELP I have no idea how to do this
*Sunday, December 13, 2015 by Physics nerd*

**Physics **

A 810.0 kg pink grapefruit is accelerated horizontally from rest to velocity of 11.0 m/s in 5.00 seconds by horizontal force. How much work is done on the pink grapefruit assume no function?
*Sunday, December 13, 2015 by .*

**Physics**

A 2-kg small block is dropped from rest. The spring has a constant k = 500N/m. If the entire track is frictionless except for the 1m between points B and C, where the coefficient of kinetic friction is 0.15, find he maximum compression of the spring.
*Sunday, December 13, 2015 by Adam*

**Physics**

A fire hose ejects a stream of water at an angle of 35.8 ° above the horizontal. The water leaves the nozzle with a speed of 21.9 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
*Sunday, December 13, 2015 by Nicole*

**Physics**

Light of wavelength 550 nm strikes a single slit of width 1.00 x 10-5 m that is 100.0 cm away from a screen. The screen is 36 cm wide, with the central maximum falling exactly at its centre. How many dark fringes in total will be seen on the screen ? Count dark fringes both ...
*Sunday, December 13, 2015 by Anonymous*

**Physics**

A 0.01 kg Styrofoam ball is released from rest 2m above the floor. It reaches a speed of 3m/s the moment before it hits the floor. How much heat due to air resistance is generated during this process?
*Sunday, December 13, 2015 by John*

**physics**

A 2,200-kg car moving east at 10.0 m/s collides with a 3,000-kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.0° north of east and at a speed of 5.16 m/s. Find the speed of the 3,000-kg car before the collision.
*Sunday, December 13, 2015 by king*

**Physics**

If a spring gains 0.400 joules of potential energy as it is stretched 0.0375 meters from its equilibrium, what is the spring's force constant?
*Sunday, December 13, 2015 by Harris *

**Physics (angle Vector)**

You have a boat that is capable of moving at 11.8 m/s through still water. You wish to cross a river that flows due south at 5.4 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due east of your current position?
*Sunday, December 13, 2015 by Aubin*

**Physics**

Starting from rest, a 10.0 Kg suitcase slides down a 3.00m long ramp inclined at 30.0 degrees from the floor. The coefficient of friction between the suitcase and ramp is .35. A: what net force is applied to suitcase while it is on the ramp? B: what is the change in the ...
*Sunday, December 13, 2015 by Harris *

**Physics **

4) if the speed limit on highways changed from 100 km/hr to 110 km /hr,how much more distance would a car need to speed: A) on dry roads*0.06 B) on wet roads *0.10 C) on icy roads *0.15 *Note convert from km/hr to m/s ,multiply by 0.278 Or m/s to km/hr ,divide by 0.278
*Sunday, December 13, 2015 by LIily*

**Physics**

Bill is moving a crate of mass 35 kg up a ramp that forms a 25 degree angle with the horizontal to a height of 5 m. A) If the ramp is frictionless, how much work must Bill do in pushing the crate to the top? B) How much work does gravity do as Bill pushes the crate up the ramp?
*Sunday, December 13, 2015 by Joseph*

**physics**

the height of the mercury in the glass tube thermometer when in melting ice and then steam are 3 cm and 18 cm respectively
*Sunday, December 13, 2015 by mercy*

**physics**

A golf ball of mass m = 0.12 kg is dropped from a height h. It interacts with the floor for t = 0.14 s, and applies a force of F = 10.5 N to the floor when it elastically collides with it.
*Sunday, December 13, 2015 by susie*

**physics **

Jake needs to catch 1 10 pound fish to last 5 days. He catches 2 3.33 pound fish, 1 2.11 pound, and 1 1 pound fish. How long will he survive with that amount of food?
*Sunday, December 13, 2015 by Joe*

**physics**

A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of 60.0o with the floor. A tension of 80.0N is maintained on the rope. What are the horizontal and vertical components of the force?
*Sunday, December 13, 2015 by km*

**Physics**

A 22kg child on a 1.75m long swing is released from rest when the swing supports make an angle of 35 degrees with the vertical. 1.What is the child's maximum potential energy? 2.Disregarding friction, find the child's theoretical speed at the lowest point. 3.If the ...
*Sunday, December 13, 2015 by Carter*

**physics **

Starting from rest, a 10kg suitcase slides down a 3.00m long ramp inclined at 30 degrees from the floor. The coefficient of friction between the suitcase and the ramp is 0.35. 1) what net force is applied to the suitcase while it is on the ramp? 2)what is the change in the ...
*Sunday, December 13, 2015 by jared*

**Physics **

A baseball catcher moves his glove away from a 40.5 m/s fastball as he catches it. If the average force he exerts on the ball is 1.01 103 N, how far does the glove move? Assume constant deceleration of the ball, which has a mass of 0.144 kg. I dont know where to start can ...
*Sunday, December 13, 2015 by Mohammad*

**Physics**

A projectile with a mass of 2.50 kg is shot horizontally from a height of 15.0 m above a flat surface. The projectile's initial speed is 22 m/s. 1.How much mechanical energy does the projectile have initially ? 2.How much work is done on the projectile by gravity as it ...
*Sunday, December 13, 2015 by Marcus*

**Physics**

Calculate the momentum of a bullet moving with a velocity of 1000m/s ,if it has a mass of 0.01kg
*Sunday, December 13, 2015 by Alexandra *

**PHYSICS( FRICTION)**

A block of 1kg is kept on another block of 2kg in a horizontal surface. Coefficient of friction between two blocks is 0.4. The blocks are given velocities of 2m/s and 8m/s in same direction.The time when relative motion between them will stop =..???
*Sunday, December 13, 2015 by Anonymous*

**physics**

a dockworker applies a constant horizontal force of 80 N to a block of ice on a smooth horizontal floor. The friction force is negligible the block start from rest and move 11m in 5 sec what is it mass & if worker stop pushing at 5sec .How for does the block move in 5 ec
*Sunday, December 13, 2015 by muqadir*

**Physics**

A 600 N skydiver in free fall is accelerating at -7.6 m/s^2 rather than -9.8 m/s^2 because of the force of air resistance. How much drag force is acting on the skydiver? a)58.2 b)65.3 c)61.4 d)40.2 I use the equation Σ(F)vertical-ma=0 To find m I did: 600/9.8 = 61.2 I end...
*Sunday, December 13, 2015 by I attempted-HELP*

**physics **

2.) A sports car is advertised to be able to stop in a distance of 50m from a speed of 90 km/h. What is its acceleration in m/s^2? How many g's is this (g=9.80 m/s^2)
*Saturday, December 12, 2015 by Emma*

**physics**

A clown is rocking on a rocking chair in the dark. His glowing red nose moves back and forth a distance of 0.42m exactly 30 times a minute in a simple harmonic motion. (a) what is the amplitude of this motion? (b) what is the period of this motion? (c) what is the frequency of...
*Saturday, December 12, 2015 by Peter *

**physics**

How much would the time keeping of a pendulum clock be affected by taking it to the moon? Gravity is 1.6m/s ^2, compared with 10m/s ^2 on the earth.
*Saturday, December 12, 2015 by Peter *

**Physics**

An automobile weighing 15,000 N crashes into a wall with a velocity of 5.00 m/s. If the car moves 0.150 m before coming to a stop, what average force does the wall exert on the car?
*Saturday, December 12, 2015 by Aidan*

**Physics**

Using proper formulas, how do you go about with this question... really confused 1.) A sprinter accelerates from rest to 10.0m/s in 1.35s. What is her acceleration (a) in m/s^2 and (b) in km/h^2? 2.) A sports car is advertised to be able to stop in a distance of 50m from a ...
*Saturday, December 12, 2015 by Emma*

**Physics -- URGENTTT**

Calculate the change in potential energy of a 78.9 kg man when he takes an elevator from the first floor to 43th floor, if the distance between floors is 4.59 m. (in J)
*Saturday, December 12, 2015 by Shaxx*

**delta prep (physics)**

A 0.27 kf bullet is fired from a 4.1kg gun the bullet leaves the gun at a speed of 200m/s what os the recoil speed of the gun
*Saturday, December 12, 2015 by karmel*

**Physics**

In a perfectly insulating container, what is the equilibrium state (temperature and phases) if one mixes 475 g of water vapor at 140 degrees Celsius with 25 g of ice at 0 degrees Celsius?
*Saturday, December 12, 2015 by Zach*

**Physics**

A 2.00 kg box slides down a rough incline plane from a height h of 1.15 m. The box had a speed of 2.77 m/s at the top and a speed of 2.34 m/s at the bottom. Calculate the mechanical energy lost due to friction (as heat, etc.). (in J)
*Saturday, December 12, 2015 by Shaxx*

**physics please urgently**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*Saturday, December 12, 2015 by jay*

**Physics**

A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m in 0.003 seconds. Determine the acceleration of the bullet. So I basically used the formula: Change in position= (Initial ...
*Saturday, December 12, 2015 by John*

**physics**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*Saturday, December 12, 2015 by jay*

**physics **

A Student jumps off a diving board that is 6.7 meters above the ground. As a student falls down what happens to the Potential energy, Kinetic energy, and the Total Mechanical energy.
*Friday, December 11, 2015 by ayleen *

**Physics**

mass of 4.00 kg rests on a rough horizontal table. The coefficient of static friction between the block and the table is 0.54. The block is attached to a hanging mass by a string that goes over a smooth pulley, as shown in the diagram. Determine the largest mass that can hang ...
*Friday, December 11, 2015 by Anonymous*

**Physics **

You have a boat that is capable of moving at 10.4 m/s through still water. You wish to cross a river that flows due west at 2.8 m/s. At what numerical compass heading must you pilot your boat so that you will reach a destination that is due south of your current position?
*Friday, December 11, 2015 by Cynthia*

**PHYSICS**

A marble with a mass of 0.5 kg is moving to the right at 1.25 m/s and a second marble with a mass of 0.35 kg is moving to the left at 2.15 m/s. If they collide head on and the collision is elastic find the final velocities of the two marbles
*Friday, December 11, 2015 by DAVID*

**physics**

A runner of mass m = 58 kg and running at 2 m/s runs as shown and jumps on the rim of a playground merry-go-round which has a moment of inertia of 408 kg·m2 and a radius of 2 meters. Assuming the merry-go-round is initially at rest, what is its final angular velocity to...
*Friday, December 11, 2015 by Anonymous*

**Ap physics 1**

The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each mass ...
*Friday, December 11, 2015 by Jonathan*

**Physics grade 11-**

A car traveling at 72 km/hr hits a tree. the driver, who has a mass of 55.0 kg comes to a rest 0.10s after the impact. What is the force that acts on the driver?
*Friday, December 11, 2015 by Maddie *

**Physics **

A woman holds a 1.90-m-long uniform 5.0-kg pole as shown in (Figure 1) ( its horizontal). A. Determine the force she must exert on the pole at A. Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is upward and ...
*Friday, December 11, 2015 by Natalie*

**Physics**

An aeroplane is heading north at a speed of 300km/h . If wind begins blowing at a speed of 50km/h from the west , calculate the magnitude of the velocity of the aeroplane relative to ground?
*Friday, December 11, 2015 by Ranya*

**Physics**

If I use 1.013x10^5 instead of given 101kpa....is it wrong?
*Friday, December 11, 2015 by Shah talal*

**Physics**

A uniform rod is 4m long and weighs 10 kg.if it is supported on a knife edge at one metre from the end what weight placed at that end keeps the rod horizontal?
*Friday, December 11, 2015 by priya*

**Physics **

Salt water is poured into a U tube until it stands 0.250 m high in each arm. Oil is then added slowly to one arm until the salt water in the other arm stands 0.300 m high. The free surface of the oil then stands at 0.321 m high. (the weight density of the salt water is 10,100N...
*Friday, December 11, 2015 by Jon*