Thursday

November 26, 2015
**physics**

When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert if her deceleration is 5.00 times the acceleration of gravity.
*Saturday, October 3, 2015 by andrew*

**Physics**

A large centrifuge is used to expose aspiring astronauts to accelerations similar to those experienced in rocket launches and atmospheric reentries. a) At what angular velocity is the centripetal acceleration 10 gs if the rider is 10.0 m from the center of rotation? (b) The ...
*Saturday, October 3, 2015 by Anonymous*

**Physics**

A 360 g model rocket is on a cart that is rolling to the right at a speed of 2.5 m/s. The rocket engine, when it is fired, exerts an 8.5 N thrust on the rocket. Your goal is to have the rocket pass through a small horizontal hoop that is 20 m above the launch point. At what ...
*Saturday, October 3, 2015 by Anonymous*

**PHYSICS**

forces of 3N and 4N and 12N act at a point in mutually perpendicular directions. Tha magnitude of the resultant force in newton is
*Saturday, October 3, 2015 by Sreethi*

**Physics**

1) A box m1 = 9.30 kg is stacked on top of another box m2 = 20.0 kg, placed on the floor inside an elevator. When the elevator is accelerating downward with a magnitude of 3.72 m/s2, what is the normal force that box m1 exerts on box m2? What is the normal force that the ...
*Saturday, October 3, 2015 by Mike*

**physics**

A metal ball is thrown vertically upwards from the top of a tower with an initial velocity of 20 metres per seconds. If the ball took a total of 6 seconds to reach ground level, determine the height of the tower.
*Saturday, October 3, 2015 by anonymous*

**Physics**

The electric field at a distance of 0.150 m from the surface of a solid insulating sphere with radius 0.367 m is 1720 N/C . Assuming the sphere's charge is uniformly distributed, what is the charge density inside it? Calculate the electric field inside the sphere at a ...
*Saturday, October 3, 2015 by jj*

**Physics**

It is friction that provides the force for a car to accelerate, so for high performance cars the factor that limits acceleration isn't the engine; it's the tires. For typical rubber-on-concrete friction, what is the shortest time in which a car coukd accelerate from 0 ...
*Saturday, October 3, 2015 by Lane*

**Physics**

Plz, i need the workings. An object is acted upon by two forces of 5N and 12N. Calculate the resultant of two forces if the forces acting perpendicular to each other
*Saturday, October 3, 2015 by Benjamin*

**Physics**

A car is traveling at a speed of 15 m/s, slams on the brakes, locking the wheel of the car. The coefficient of kinetic friction between the tires and the road is 0.64. What is the speed of the vehicle after 2 seconds have passed?
*Friday, October 2, 2015 by Jose F3*

**Physics**

A conducting solid sphere (R = 0.24 m, q = 7.6x10^-6 C) is shown in the figure. Using Gauss's Law and two different Gaussian surfaces, determine the electric field (magnitude and direction) at point A, which is 0.000001 m outside the conducting sphere. (Hint: One Gaussian ...
*Friday, October 2, 2015 by Geneva*

**Physics**

In a repair shop a truck engine that has mass 429 kg is held in place by four light cables (Figure 1) . Cable A is horizontal, cables B and D are vertical, and cable C makes an angle of 37.1∘ with a vertical wall. Tension in cable A is 729 N . a.What is the tension in ...
*Friday, October 2, 2015 by David*

**physics**

A care package is released from a plane moving with a horizontal speed of 123 m/s. The plane flies at a constant height of 1013 m above the ground. a.) Find the speed of the care package just before it hits the ground. b.) Find the magnitude of the angle with respect to the x-...
*Friday, October 2, 2015 by Janice*

**E& M physics**

Three electrons form an equilateral triangle 0.600 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?
*Friday, October 2, 2015 by Master Blaster*

**Physics **

A block M1 of mass 20.0 kg sits on top of a larger block M2 of mass 30.0 kg which sits on a flat surface. The kinetic friction coefficient between the upper and lower block is 0.415. The kinetic friction coefficient between the lower block and the flat surface is 0.115. A ...
*Friday, October 2, 2015 by Marty*

**physics**

Suppose the horizontal sweep of an oscilloscope takes 80ms how many cycles of a 100 Hz wave will be shown?
*Friday, October 2, 2015 by stephanie*

**Physics. Interesting group question**

Does Newton's laws apply on earth even though we are constantly accelerating? I thought it would be true because it would apply to the uniform circular motion wouldn't it?
*Friday, October 2, 2015 by Alessandra*

**physics**

a mango fruit drops to the ground from the top of its tree which is 5m high.how long does it take to reach the ground?
*Friday, October 2, 2015 by adeoye*

**Physics**

When you pull out a stuck drawer, the force of static friction causes it to stick in place. This causes the drawer to jerk outwards, sometimes violently. Assume that you apply a constant force just large enough to “unstick” the drawer, but that when the drawer comes ...
*Friday, October 2, 2015 by Anon2013*

**physics**

you throw a ball from a cliff with an initial velocity of 15m/s at an angle of 20° below the horizontal.find(a) its horizontal displacement and(b) its vertical displacement 2.3sec later?
*Friday, October 2, 2015 by maaz*

**physics**

The elastic potential energy E is given by E=C p^2 g^2 A l0^3,where p is the density of the metal.g is the acceleration of free fall. A is the cross-sectional area of the wire and C is a constant. determine the si base units of C? Am Confused...help.
*Friday, October 2, 2015 by chancy*

**Physics - Inverted pendulum**

Hello. My son is in pre-school, but he's already starting his Undergraduate for college. Never too early to start, right? So he got this problem for homework. Can anyone help? He supposedly needed "nap time" and slept through the entire lecture the professor was ...
*Friday, October 2, 2015 by John Cena*

**Physics acceleration**

A car accelerates uniformly from rest to a speed of 91.4 mi/h in 7.68 s. Find the constant acceleration of the car. Answer in units of m/s
*Thursday, October 1, 2015 by Jackie*

**AP Physics**

Question Part Points Submissions Used The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters ...
*Thursday, October 1, 2015 by Anonymous*

**physics**

Only two forces act on an object (mass=4.41 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.
*Thursday, October 1, 2015 by jordan*

**physics**

Two forces A and B are applied to an object whose mass is 12.3 kg. The larger force is A . When both forces point due east, the object's acceleration has a magnitude of 0.443 m/s2. However, when A points due east and B points due west, the acceleration is 0.280 m/s2, due ...
*Thursday, October 1, 2015 by jordan*

**Physics help!!**

A 0.15 kg baseball is moving at 49 m/s toward home plate when it is hit with the bat. The ball is in contact with the bat for 0.0022 s, and leaves the bat at 25 m/s directly away from home plate. Determine the average force exerted by the bat on the ball.
*Thursday, October 1, 2015 by jerod*

**Physics**

There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target A pilot flying low and slow drops a weight; it takes 1.6 s to hit the ground, during which it travels a horizontal distance of 160 m . Now the pilot does a run ...
*Thursday, October 1, 2015 by raquel *

**physics**

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 25 m/s at an angle 24 ∘ above the horizontal...
*Thursday, October 1, 2015 by raquel *

**physics**

An astronaut on a strange planet nds that she can jump a maximum horizontal distance of 30 m if her initial speed is 9 m/s. What is the acceleration of gravity on the planet? θ=45° because maximum distance R=(Vi²/g)(sin2θ) g=2.7m/s² correct?
*Thursday, October 1, 2015 by ari*

**Physics**

A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.4 cm below the aim point What was the bullet's speed as it left the barrel? Express your answer to two significant figures and include the appropriate units
*Thursday, October 1, 2015 by raquel *

**physics**

A net horizontal force F =A +Bt^3 acts on a 2kg object, where A = 5N and B = 2N/s3. What is the horizontal velocity of this object 4.0 seconds after it starts from rest? F=ma=5+2t^3 a=2.5+t^3 V=2.5t+(1/4)(t^3) therefore, at t=4, V=74m/s Is this correct?
*Thursday, October 1, 2015 by ari*

**Physics**

A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 14 m/s, skates by with the puck. After 3.5 s, the first player makes up his mind to chase his opponent. (a) If he accelerates uniformly at 4.0 m/s2, how long does...
*Thursday, October 1, 2015 by Michael*

**Physics **

A ball is tossed straight up into the air with a velocity of 37 m/s. What is its velocity at the top of its flight?
*Thursday, October 1, 2015 by Isabelle*

**Physics**

A road heading due east passes over a small hill. You drive a car of mass m at constant speed v over the top of the hill, where the shape of the roadway is well approximated as an arc of a circle with radius R. Sensors have been placed on the road surface there to measure the ...
*Thursday, October 1, 2015 by David*

**physics **

A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?
*Thursday, October 1, 2015 by Anonymous*

**Physics **

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.41 m. The stones are thrown with the same speed of 8.35 m/s. Find the location (above the base of the ...
*Thursday, October 1, 2015 by bob*

**physics**

A skier leaves the top of a ski ramp at an angle of 25 degrees with an initial velocity of 10 m/s. The ramp is 60 m high, neglecting air resistance determine: a. The time it takes the sk ier to reach the ground. b. How far away from the base does he land? c. How high above the...
*Thursday, October 1, 2015 by T*

**physics**

A ball is kicked with an initial velocity of 20.0 m/s at an angle of 35 degrees to the ground. If it is to pass over a wall 5.6 m high determine a. The minimum horizontal the wall can be placed from the ball’s launch point in meters. b. What would be the ball’s ...
*Thursday, October 1, 2015 by T*

**physics**

A skier leaves the top of a ski ramp at an angle of 25 degrees with an initial velocity of 10 m/s. The ramp is 60 m high, neglecting air resistance determine:
*Thursday, October 1, 2015 by T*

**Physics**

Sam, whose mass is 71.0 kg , takes off down a 51.0 m high, 11.0 ∘ slope on his jet-powered skis. The skis have a thrust of 210 N . Sam's speed at the bottom is 41.0 m/s .
*Thursday, October 1, 2015 by W*

**Physics**

In air, the distance traveled by a sound wave is 140 meters during 400 vibrations. If the frequency of the tuning fork is 500 Hz, find the velocity of sound in air. Here's what I did: Wavelength= 140/400=0.35 So, velocity= 500*0.35= 175 m/s Am I right?
*Thursday, October 1, 2015 by Anonymous*

**Physics **

Near the end of a marathon race, the first two runners are separated by a distance of 45.0 m. The front runner has a velocity of 3.50 m/s, and the second a velocity of 4.20 m/s. (a) What is the velocity of the second runner relative to the first? (b) If the front runner is 250...
*Thursday, October 1, 2015 by Mike*

**Physics **

A hockey player is moving at 7.00 m/s when he hits the puck toward the goal. The speed of the puck relative to the player is 32.0 m/s. The line between the center of the goal and the player makes a 90° angle relative to his path as shown in Figure 3.30. What angle must the...
*Thursday, October 1, 2015 by Mike*

**Physics **

A ship sets sail from Rotterdam, The Netherlands, heading due north at 5.00 m/s relative to the water. The local ocean current is 1.54 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
*Thursday, October 1, 2015 by Taylor*

**Physics addition of velocities**

A seagull flies at a velocity of 7.00 m/s straight into the wind. (a) If it takes the bird 17.0 min to travel 6.00 km relative to the earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to return 6.00 km?
*Thursday, October 1, 2015 by Marcus*

**Physics**

An aircraft piston engine starts from rest and accelerates to 1500rpm in 4.95s. This engine through a reduction gearbox drives a 9m diameter propeller at 55rpm What is the engine's angular displacement in 4.95s?
*Thursday, October 1, 2015 by Lisa*

**physics**

A superhero flies 172 m from the top of a tall building at an angle of 23 ◦ below the horizontal. What is the horizontal component of the superhero’s displacement? Answer in units of m.
*Thursday, October 1, 2015 by Anonymous*

**physics**

A truck travels up a hill with a 13◦ incline. The truck has a constant speed of 18 m/s. What is the horizontal component of the truck’s velocity? Answer in units of m/s
*Thursday, October 1, 2015 by Anonymous*

**Physics**

Consider a car with front cross-sectional area of A=(1.77±0.02)m^2 and a drag coefficient of C=(0.38±-.02) moving with a speed of v=(10.0±0.5)m/s. Suppose that the density of air is p=1.20 kg/m^3 at the sea level. Calculate the force F=(1/2)CApv^2 on the ...
*Thursday, October 1, 2015 by NONEE*

**physics**

While following the directions on a treasure map, a pirate walks 37.8 m north, then turns and walks 5.2 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m. 004 (part 2 of 2) 10.0 ...
*Thursday, October 1, 2015 by Anonymous*

**physics**

At what angle with the north would he have to walk? Answer in units of ◦ .
*Thursday, October 1, 2015 by Anonymous*

**physics**

While following the directions on a treasure map, a pirate walks 37.8 m north, then turns and walks 5.2 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m.
*Thursday, October 1, 2015 by Anonymous*

**Physics**

A bullet shot horizontally strikes the ground with a velocity of 150.0km/h (10 degrees below the horizontal), determine the height from which it was fired.
*Thursday, October 1, 2015 by Jacob*

**PHYSICS**

a truck with a mass of 5000 kg and a velocity of 15.0 m/s collides head-on with a car whose mass is 1000 kg, moving at 30.0 m/s. if the two vehicles move together after the impact, at what velocity do they move?
*Thursday, October 1, 2015 by LL*

**PHYSICS**

a car has a mass of 1200kg.The area of the tire in contact with the ground is .02m^2. What is the pressure of each tire?
*Thursday, October 1, 2015 by LL*

**PHYSICS**

compute for the density of a brake fluid used in a car which has a volume of 600cm^3 and a mass of 100 g?
*Thursday, October 1, 2015 by LL*

**PHYSICS**

Calculate the stress, strain and young's modulus of a wire with a cross-sectional area of 3 x 10^-7 m^2 and a length of 0.6 m that is stretched to a distance of 1.2 x 10^-3 by a 120 N force.
*Thursday, October 1, 2015 by LL*

**PHYSICS**

A spring of a car has a spring constant of 155 N/m. what is the force needed to stretch the spring by 5.00 cm from its original length?
*Thursday, October 1, 2015 by LL*

**physics**

A 0.19 kg hockey puck has a velocity of 2.1 m/s toward the east (the +x direction) as it slides over the frictionless surface of an ice hockey rink. What are the (a) magnitude and (b) direction of the constant net force that must act on the puck during a 0.36 s time interval ...
*Thursday, October 1, 2015 by john*

**Physics **

A 0.050 kg cart has a spherical dome that is charged to +1.0 x 10–5 C. The cart is at the top of a 2.0-m long inclined plane that makes a 30° angle with the horizontal. The cart and the plane are placed in an upward pointing vertical uniform 4000N/C E-field. How long ...
*Wednesday, September 30, 2015 by Kyle*

**physics**

Consider two vectors where F1 = 98 N , F2 = 61N,θ1 = 343◦ ,andθ2 = 68◦ ,measuredfrom the positive x axis with the counter-clockwise angular direction as positive. What is the magnitude of the resultant vec- tor F⃗ = F⃗ 1 + F⃗ 2 What is ...
*Wednesday, September 30, 2015 by yifei*

**PHYSICS**

CALCULATE THE ENERGY PRESSURE WHEN 20 GRAMS OF STEAM AT 100 DEGREES CELSIUS COOLS TO ICE AT-20 DEGREES CELSIUS.
*Wednesday, September 30, 2015 by ROJAI*

**PHYSICS**

A placekicker is about to kick a field goal. The ball is 20.1 m from the goalpost. The ball is kicked with an initial velocity of 18.7 m/s at an angle θ above the ground. Between what two angles, θ1 and θ2, will the ball clear the 3.12-m-high crossbar? Give your...
*Wednesday, September 30, 2015 by Tori*

**Physics **

a block of mass 5.62 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 2.53 kg which hangs in the air. Calculate the Acceleration of the first block. The acceleration of gravity is 9.8 m/s square root ...
*Wednesday, September 30, 2015 by Beatriz *

**Physics**

Runner A runs 7.5 meters per second and runner B runs 7.9 meters per second. Runner A has a 55 meter lead, how long will it take runner B to catch runner A?
*Wednesday, September 30, 2015 by Abe*

**physics**

A box of mass 50 kg starts from rest to slide down a ramp that makes an angle of 10.7 degrees with respect to the horizontal. 6.3 seconds later, it has covered a distance of 3.39 meters. What is the coefficient of kinetic friction?
*Wednesday, September 30, 2015 by Caroline*

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 17.4 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 291 kg. (a) Determine the tension in the cable attached to ...
*Wednesday, September 30, 2015 by Anonymous*

**Physics**

In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train ...
*Wednesday, September 30, 2015 by Anonymous*

**Physics**

You would like to shoot an orange in a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. On your first try, you fire the arrow at 32.0 m/s at an angle of 30.0° above the horizontal from a height of 1.10 m while standing 52.0 m away. Treating the ...
*Wednesday, September 30, 2015 by Colin *

**physics**

in a slap shot,a hockey player accelerates the puck from a velocity of 5.5m/s to 36m/s. if the shot take 3.16*10^-2, find the distance
*Wednesday, September 30, 2015 by Anonymous*

**physics**

A ball starts at the top of a ramp with an incline of 7 degrees and rolls down, picking up speed. (see the table below) Time (s) Position (m) 0 0 .4917 .1 .7625 .15 .975 .3 1.1583 .45 1.2833 1.6467 (a) Linearize the data and find the slope of the new line. [Slope=.3745?] (b) ...
*Wednesday, September 30, 2015 by Daniel*

**Physics**

A 2.00 kg box slides down a rough incline plane from a height h of 1.99 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.) If I were to calculate the energy lost, it would be...
*Wednesday, September 30, 2015 by Ronnie*

**physics**

Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds, the speed of light is 2.998 x 108 m/s)
*Wednesday, September 30, 2015 by Anonymous*

**Physics 114**

an object is dropped from a height of 7.00 meters and takes 1.19 seconds to fall to the ground. What is the acceleration due to gravity estimated from this measurement? Suppose the experiment above is done five times. Determine the mean fall time and the standard error using ...
*Wednesday, September 30, 2015 by Elizabeth*

**physics**

10. The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 12.4 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0....
*Wednesday, September 30, 2015 by johnny*

**physics**

A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.4 cm below the aim point. Part A What was the bullet's flight time? Neglect the air resistance Part B What was the bullet's speed as it left the barrel?
*Wednesday, September 30, 2015 by raquel *

**Physics**

A small plane is 150 km south of the equator. The plane is flying at 150 km/h at a heading of 30∘ to the west of north. how many minutes will the plane cross the equator?
*Wednesday, September 30, 2015 by raquel *

**physics**

An extreme skier slides down an incline that forms an angle 24 degrees above the horizontal. The skier starts from rest and accelerates firmly at 4.00m/s^2 for a distance of 50.0m to the edge of a cliff. The cliff is 30.0m above the powdery snow below. Find how far from the ...
*Wednesday, September 30, 2015 by jason*

**Physics**

How long does it take an automobile traveling 72.5 km/h to become even with a car that is traveling in another lane at 55.5 km/h if the cars’ front bumpers are initially 146 m apart?
*Wednesday, September 30, 2015 by cortney*

**Physics**

A red colored ball tossed upward reaches a maximum height of 3.0m. show that the initial speed is 7.7m/s^2.
*Tuesday, September 29, 2015 by Erin*

**Physics**

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.44 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.
*Tuesday, September 29, 2015 by Courtney*

**Physics**

I have a question about a vector addition problem using the polygon method. Vector 1 has a magnitude of .1 and theta of 30 degrees. Vector 2 has a magnitude of .2 and a theta of 90 degrees. Vector 3 has a magnitude of .3 and a theta of 225 degrees. I'm confused because if ...
*Tuesday, September 29, 2015 by Claire*

**physics**

An object is thrown vertically up and attains an upward velocity of 10 m/s when it reaches one fourth of its maximum height above its launch point. What was the initial speed of the object? The acceleration of gravity is 9.8 m/s2. Answer in units of m/s
*Tuesday, September 29, 2015 by Curt*

**Physics**

Vector A and vector B both lie in the same xy plane . Is it possible for them to have same magnitude but different components and same components but different magnitude ?
*Tuesday, September 29, 2015 by Tapendra*

**Physics**

A parachutist bails out of airplane and suddenly parachute did not open but after falling 80 m he opens his parachute due to which retardation of 4m/s . He reaches on the ground with velocity 4m/s . What was the height of airplane at the time of bail and total time taken by ...
*Tuesday, September 29, 2015 by Tapendra*

**Physics**

Two soccer players start from rest, 30 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.49 m/s2. The second player’s acceleration has a magnitude of 0.43 m/s2. (a) How much time passes ...
*Tuesday, September 29, 2015 by Natasha*

**Physics**

In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.20 m/s in 3.56 s. Assuming that the player accelerates uniformly, determine the distance he runs.
*Tuesday, September 29, 2015 by Natasha*

**Physics**

What effect does the normal force have on the coefficients of friction?
*Tuesday, September 29, 2015 by Frank*

**Physics**

A car travels due east with a speed of 40.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 54.0° with the vertical. Find the velocity of the rain with respect to ...
*Tuesday, September 29, 2015 by Aly*

**physics**

obtain the resultant and direction of each pair of the forces 1.20N on top of a triangle and, 15N3 under the triangle and 45 as the degree of the triangle. 2.20N on top of right angle triangle and 15N under the right angle triangle.
*Tuesday, September 29, 2015 by godsgift*

**Physics**

Select the motion diagram that corresponds to each of the four situations. E.g., if diag. A corresponds to the first situation, diag. C to the second, and none of the diagrams to situations 3 and 4, enter ACNN. Note that the velocity and acceleration vectors are shown; both ...
*Tuesday, September 29, 2015 by Mike*

**Physics**

Select the motion diagram that corresponds to each of the four situations. E.g., if diag. A corresponds to the first situation, diag. C to the second, and none of the diagrams to situations 3 and 4, enter ACNN. Note that the velocity and acceleration vectors are shown; both ...
*Tuesday, September 29, 2015 by Michael *

**physics**

water flows in river 0.5km wide with speed 6km/hr. A boat can travel with speed 10km/hr in still water. In what direction should boat sail to reach opposite bank?
*Tuesday, September 29, 2015 by mcqueen*

**Physics Projectile Motion**

A projectile is launched at ground level with an initial speed of 51.5 m/s at an angle of 35.0° above the horizontal. It strikes a target above the ground 2.50 seconds later. What are the x and y distances from where the projectile was launched to where it lands?
*Tuesday, September 29, 2015 by Marcus*

**Physics Projectile Motion**

An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected here, the ...
*Tuesday, September 29, 2015 by Abby*

**Physics Projectile Motion**

A ball is kicked with an initial velocity of 21 m/s in the horizontal direction and 16 m/s in the vertical direction. (Assume the ball is kicked from the ground.) (a) At what speed does the ball hit the ground? (b) For how long does the ball remain in the air? (c) What maximum...
*Tuesday, September 29, 2015 by Abby*

**physics **

A rectangular coil of dimensions 20cm by 15cm lies with its plane parallel to a magnetic field of 0.5W/m^2. The coil, carrying a current of 10A experiences a torque of 4.5Nm in the field. How many loops has the coil?
*Tuesday, September 29, 2015 by CALLISTUS *

**Physics**

A car travels 3.0km due south and then 4.0km due west.what is it displacement from the starting point. R^2=A^2 B^2 am not sure if dat is the formula please help me
*Tuesday, September 29, 2015 by Kazekage carter kumo*

**Physics**

A shell is fired from the ground with an initial speed of 1.62 ✕ 103 m/s at an initial angle of 58° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range.
*Monday, September 28, 2015 by Caleb*