Saturday

July 4, 2015

July 4, 2015

**physics**

A projectile of mass 1.000 kg is shot straight up with an initial speed of 23.0 m/s. (a) How high would it go if there were no air resistance? i got 26.99, which is correct (b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average ...
*Sunday, June 21, 2015 by Lola*

**physics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have ...
*Sunday, June 21, 2015 by Lola*

**physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is thirty-four times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites. Thank you!
*Sunday, June 21, 2015 by Lola*

**Physics **

A wheel has a radius of 3.1 m. How far (path length) does a point on the circumference travel if the wheel is rotated through the following angles, respectively? (a) 36° m (b) 36 rad m (c) 36 rev m
*Sunday, June 21, 2015 by Antonio*

**physics 1401**

If a vector A= -5.0x-4.0y and vector B = -3.0x+8.0y, then the magnitude of vector C= A-B is a. 13.4 b. 12.2 c. 148 d. 7.2 e. 4.5
*Sunday, June 21, 2015 by jcarrington*

**physics**

A 30-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 205 J from 435 J. How high does she rise during this interval? Neglect air resistance.
*Sunday, June 21, 2015 by Lola*

**physics**

A 54.5-kg skateboarder starts out with a speed of 1.95 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the ...
*Sunday, June 21, 2015 by Lola*

**physics**

A 50-kg box is being pushed a distance of 6.4 m across the floor by a force P with arrow whose magnitude is 154 N. The force P with arrow is parallel to the displacement of the box. The coefficient of kinetic friction is 0.24. Determine the work done on the box by each of the ...
*Sunday, June 21, 2015 by Lola*

**physics**

A baseball is thrown from the roof of a 24.0-m-tall building with an initial velocity of magnitude 10.0 m/s and directed at an angle of 53.1° above the horizontal.
*Sunday, June 21, 2015 by Anonymous*

**physics 1401**

A bullet is fired from a gun at 300 m/s. It hits the ground at 3s later. At what angle (in degrees) above the horizon was the bullet fired? (Assume no air resistance)
*Sunday, June 21, 2015 by jcarrington*

**Physics **

Two cars AandB travel along the same road in the Sam direction from the Same starting place.Car A maintains speed of 50km/h and car B 60km/h,but starts one hour later. how many hours will take for B to overtake A?
*Sunday, June 21, 2015 by nisha*

**Typos, math, physics**

Would everyone who posted math and physics problems this morning please go back and check for typos? It is difficult to guess what you mean and we do not have your text book.
*Sunday, June 21, 2015 by Damon*

**physics**

water heated to 50 degrees celsius is poured on our body during bathing what is equilibrium temperature of our body.spesific heat of water is 1.
*Sunday, June 21, 2015 by ramsaiteja*

**physics**

in einstein's famous equation e=mc^2, describing the relationship between matter and energy, the units for E are m=====>kg, c=====>m/s a) kg m/s b)kg m/s^2 c) m^2/s^2 d)kg m^2/s^2 I think its either B or D but indecisive...
*Saturday, June 20, 2015 by jcarrington*

**PHYSICS**

A BOATMAN ROWS TO A PLACE 48KM DISTANT AND BACK IN 14 HOURS; HE FINDS HE CAN ROW 4KM WITH THE STREAM IN THE SAME TIME AS 3KM AGAINST THE STREAM. FIND THE RATE OF THE STREAM? please help me :(
*Saturday, June 20, 2015 by CASS*

**PHYSICS**

A and B run around a circular track whose cicumference is 150m. when they run is opposite directions they meet every 5 seconds, but when they run in the same direction from the some point they are together every 25 seconds. what are their rates? ans. 18m/s and 12m/s please ...
*Saturday, June 20, 2015 by Natalie*

**PHYSICS**

A and B run around a circular track whose cicumference is 150m. when they run is opposite directions they meet every 5 seconds, but when they run in the same direction from the some point they are together every 25 seconds. what are their rates? ans. 18m/s and 12m/s can you ...
*Saturday, June 20, 2015 by Natalie*

**physics **

A small truck runs off the road and over a 100metre high cliff. It lands 50 metre from the base of the cliff. How long did it take for the truck to hit the ground
*Saturday, June 20, 2015 by andrew *

**Physics**

In class, we built a model of a roller coaster that would be one-hundredth of the size of the roller coaster if it were to be built in real life. On the model we built, 3.38G's were recorded. Would the amount of G-forces on the model roller coaster remain the same on the ...
*Saturday, June 20, 2015 by Isabelle*

**Physics**

Olympic diver Matthew Mitcham springs upward from a diving board that is 3.00 m above the water. He enters the water at a 79.0 degree angle with respect to the water surface, at a speed of 9.01 m/s. Determine the magnitude of his initial velocity. Determine the direction of ...
*Friday, June 19, 2015 by Rachel*

**PHYSICS**

It involves three masses, with mass 2 being the cart that can roll freely on a horizontal table. There is no friction anywhere. The cart system is let go with everything initially at rest. You are to find the accelerations for each of the three masses relative to the ground. (...
*Friday, June 19, 2015 by Lee M*

**physics**

car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second. What is the velocity of...
*Friday, June 19, 2015 by se*

**physics**

A refrigerator with a weight of 1,127 newtons needs to be moved into a house using a ramp. The length of the ramp is 2.1 meters, and its height is 0.85 meters. What is the percentage efficiency if a force of 496 newtons is applied to the refrigerator? 44 percent 58 percent 64 ...
*Friday, June 19, 2015 by se*

**physics**

A box weighing 200 newtons is hanging from the ceiling. The value of 2 is 65°. Tensions T1 and T2 are 70 newtons and 130 newtons respectively. What is 1? 0.05° 25.2° 38.29° 76.58° 89.9°
*Friday, June 19, 2015 by se*

**Physics**

An air puck of mass 0.382 kg is tied to a string and allowed to revolve in a circle of radius 0.64 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.67 kg is tied to it. The suspended mass ...
*Friday, June 19, 2015 by Josh*

**physics**

Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?
*Friday, June 19, 2015 by bianca*

**Physics**

The ratio of velocities of sound in hydrogen and oxygen at stp is???
*Friday, June 19, 2015 by Roshan*

**Physics **

A mass is being pulled forward at a constant velocity of 3 m/s with a force of 15 N. The weight of the mass is 9.0 N. What applied force must be exerted so that the mass will accelerate to 14 m/s in 4.0 seconds. *Another one I don't understand. I even tried converting the ...
*Friday, June 19, 2015 by Austin*

**Physics **

A falling toy, mass 10.0 kg experiences an upward force due to air friction of 40.0 N. Find the acceleration of the toy. I honestly have no idea how to solve this question. Could someone please help me? :(
*Friday, June 19, 2015 by Austin*

**physics**

A body is projected at an angle of 30degree to the horizontal with a velocity of 150metre per seconds.Calculate the time it takes to reach the greatest height,take g=10metre per seconds square and neglect air resistance.
*Thursday, June 18, 2015 by scott*

**physics**

A student of weight 810 N was sent to another planet called Nerdland. If Nerdland has a mass that is 4 X the mass of the earth and a radius that is 1/2 the radius of the earth, what would be the mass in kg of the student when on Nerdland? what would be the weight in N of the ...
*Thursday, June 18, 2015 by Anonymous*

**PHYSICS**

27. Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown.
*Thursday, June 18, 2015 by GILL*

**physics**

In the following situations identify the agent exerting the force and the object on which it acts .State the effect and kind of force in each case. a>Falling of rain drops. b>A horse pulling a cart. c>A car coming to rest once its engine is switched off. d>The ...
*Thursday, June 18, 2015 by deepti*

**Physics**

A typical tumor treated with radiotherapy may receive 400 Gy per 250g. How many disintegrations of caesium-137 atoms are required to provide that absorbed dose? Help would be appreciated!
*Thursday, June 18, 2015 by Please help!*

**physics**

A 115-N sign is supported by two ropes. One rope pulls up and to the right 26.5° above the horizontal with a tension T1, and the other rope pulls up and to the left 48.5° above the horizontal with a tension T2, as shown in the figure. Find the tensions T1 and T2.
*Wednesday, June 17, 2015 by chris browning*

**Physics**

An electron starts from one plate of a charged closely spaced (vertical) parallel plate arrangement with a velocity of 1.78×104m/s to the right. Its speed on reaching the other plate, 2.25cm away, is 3.63×104m/s . If the plates are square with an edge length of 26....
*Wednesday, June 17, 2015 by Yasamin*

**physics**

four resistor of resistances 1ohm,2ohm,3ohm,5ohm, are connected in series and afterwards in parallel.calculate the combined resistance in each case
*Wednesday, June 17, 2015 by Alade*

**Physics**

A sprinkler mounted on the ground sends out a jet of water at a 35∘ angle to the horizontal. The water leaves the nozzle at a speed of 15m/s . How far does the water travel before it hits the ground?
*Wednesday, June 17, 2015 by Tommy*

**Physics**

3. Johnny, of mass 65 kg, and Lucy, of mass 45 kg, are facing each other on roller blades. The coefficient of kinetic friction between the roller blades and concrete surface is 0.20. When Johnny pushes Lucy from rest he applies a force for 1.0 s. Lucy then slows down to a stop...
*Wednesday, June 17, 2015 by Furkan*

**Physics**

A photon having wavelength λ scatters off a free electron at A (see figure below), producing a second photon having wavelength λ'. This photon then scatters off another free electron at B, producing a third photon having wavelength λ'' and moving in ...
*Wednesday, June 17, 2015 by melanie*

**Physics**

2. An elephant is pushing, with 75 000 N of force, on two jeeps that are stuck in the mud. The elephant pushes on the first jeep (which is 2000 kg (2 SD)) and it, in turn, pushes on the second jeep (which is 1500 kg). The co-efficient of friction between the jeeps and the mud ...
*Wednesday, June 17, 2015 by Furkan*

**Physics**

Levon throws a ball straight upwards with an initial velocity of 15.0 m/s. a.How high will it reach? b.How long will it take unit his friend in a tree 5.0 m above him catches the ball? (he catches the ball on its way back down)
*Wednesday, June 17, 2015 by Furkan*

**Physics**

Jennifer is running the 100.0 m dash at track. She accelerates at a rate of 0.88 m/s2 for the first 45 m and then maintains this speed for the remainder of the race. How long will it take her to finish the race?
*Wednesday, June 17, 2015 by Furkan*

**Physics**

An elevator with a mass of 1.0 x 10^3 kg accelerates downward at 0.10 m/s^2. What would the force of tension be in the supporting elevator cable?
*Wednesday, June 17, 2015 by Furkan*

**Physics **

A mass, 5.0 kg is being pulled from rest with an applied force of 25N. The friction force is 10.0N. How far has it moved after 6.0s?
*Wednesday, June 17, 2015 by Furkan*

**Physics**

So we did this lab about how we are to measure the half life of the beta decay of indium 116 (the indium 116 is captured by indium 115 and undergoes beta decay to become tin 116. Since the Indium 116 I reused I understand that every time we use it, the indium 116 becomes a ...
*Wednesday, June 17, 2015 by Anna*

**physics**

A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 49 m and acquired a velocity of How long did the burn ...
*Wednesday, June 17, 2015 by gillies*

**physics**

a bullet moving with a velocity of 10m/s is stopped after penetrating the wooden plank of 4 cm of thickness. calculate acceleration of the bullet
*Wednesday, June 17, 2015 by nothing*

**physics**

identify tie force fields from the following : density field, temperatuse field, gravitational field, magnetic field, electrostatic field, electric field
*Tuesday, June 16, 2015 by Anonymous*

**physics**

the lines of force of a magnetic field do not cross. why is this so
*Tuesday, June 16, 2015 by alade olushola*

**Physics**

A projectile of mass 0.636 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.8 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ...
*Tuesday, June 16, 2015 by alex*

**physics**

A person goes to market,makes purchases and comes back at a constant slower speed.Draw displacement-time and velocity time graphs of the person
*Tuesday, June 16, 2015 by nikitha*

**physics**

A small bead of mass 100 g is able to slide along a frictionless wire. The wire is bent into a semicircle of radius 10 cm and rotates about a vertical axis with angular velocity 12.5 rad/s. (i) Draw a free body diagram depicting the forces acting on the bead (ii) For what ...
*Tuesday, June 16, 2015 by Khali Barkho*

**Physics **

Three blocks of mass 10kg, 20kg, 15kg respectively are being pushed in a row on along a horizontal surface with constant velocity by a force applied to the 10kg block.The coefficient of kinetic friction between each of the blocks and the surface is 0.18. What is the magnitude ...
*Tuesday, June 16, 2015 by Alex*

**Physics**

A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 degrees, and the man pulls upward with a force whose direction makes an angle of 30.0 degrees with the ramp. How large a force is necessary for the x component of the force...
*Monday, June 15, 2015 by Michaelanne*

**Physics**

Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg . A horizontal force of 100N is exerted on box A. What is the magnitude of the force that box A exerts on box B?
*Monday, June 15, 2015 by Sarah*

**Physics**

A rowboat is heading across a river at 2.4 m/s east. The current of the river is 1.7 m/s south. What is the rowboat's resultant velocity?
*Monday, June 15, 2015 by Kathy*

**Physics**

A body moved on x-axis at time t secs, the displacement of the particle from the origin is x-metre and the velocity of the particle is vm/s when t=0, s=0 and v=0. 1) given that the particle moves at a constant acceleration and that v=1 when t=4, find a)the value of ...
*Monday, June 15, 2015 by clement*

**physics**

A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?
*Monday, June 15, 2015 by alex*

**Physics**

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 4.00 x 10-6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, ...
*Monday, June 15, 2015 by Anna*

**physics**

An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...
*Monday, June 15, 2015 by alex*

**physics**

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
*Monday, June 15, 2015 by alex*

**physics**

Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
*Monday, June 15, 2015 by alex*

**physics**

A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
*Monday, June 15, 2015 by alex*

**physics**

a man goes 10m towards north,then 20m towards east then displacement is what
*Monday, June 15, 2015 by sajid*

**Physics**

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !
*Monday, June 15, 2015 by Sasha*

**physics**

If R is the range for an angle of projectin 0f 15¤ wd the horizntl ' then the 0thr angle of projection for which the range is R 'is
*Monday, June 15, 2015 by dani*

**Physics **

What is the significance in the observation of discrete spectral lines in the emission spectrum of hydrogen??
*Monday, June 15, 2015 by Anna*

**physics**

A steel section of the Alaskan pipeline had a length of 58.5 m and a temperature of 18.0 °C when it was installed. What is its change in length when the temperature drops to a frigid -37.7 °C?
*Sunday, June 14, 2015 by ashley*

**physics**

The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29.0 °C the air gap between the rods is 1.93 x 10-3 m. At what temperature will the gap be closed?
*Sunday, June 14, 2015 by ashley*

**physics**

A copper kettle contains water at 29.1 °C. When the water is heated to 86.6 °C, the volume of the kettle expands by 5.56 x 10-5 m3. Determine the volume of the kettle at 29.1 °C.
*Sunday, June 14, 2015 by ashley*

**physics**

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 31.8...
*Sunday, June 14, 2015 by ashley*

**physics**

An ice chest at a beach party contains 12 cans of soda at 4.56 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.54-kg watermelon at 28.5 °C to the chest. The specific heat capacity of watermelon is nearly ...
*Sunday, June 14, 2015 by ashley*

**physics**

Two bars of identical mass are at 29 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 92 °C, ...
*Sunday, June 14, 2015 by ashley*

**physics**

How much heat in joules must be added to 0.413 kg of aluminum to change it from a solid at 122 °C to a liquid at 660 °C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg.
*Sunday, June 14, 2015 by ashley*

**physics**

A thick, vertical iron pipe has an inner diameter of 0.070 m. A thin aluminum (α = 23x10-6 (C°)-1) disk, heated to a temperature of 89°C, has a diameter that is 4.4x10-5 m greater than the pipe's inner diameter. The disk is laid on top of the open upper end of...
*Sunday, June 14, 2015 by ashley*

**physics**

A cart with a mass is of 6 kg rolls across a level surface. The wheels on the cart make the effects of friction negligible. A force of 3.0 N is applied to the cart, describe the carts motion.
*Sunday, June 14, 2015 by chuck*

**physics**

A point charge 5 micro couloumb is at the centre of a cubical gaussian surface 100cm on edge. Calculate the electric flux through the surface.
*Sunday, June 14, 2015 by clement*

**physics**

Compute the electric field about a uniformly charged plane sheet using gauss law.
*Sunday, June 14, 2015 by clement*

**physics**

You have four point charges 2q, q, -q and -2q. If possible, describe how you would place at least the charge 2q (and perhaps other charges) and through which the net electric flux is a) 0 b) +3q/£0 c) -2q/£0
*Sunday, June 14, 2015 by clement*

**physics**

A car moves with constant velocity along a straight road. Its position is x1 = 0 m at t1 = 0 s and is x2 = 48m at t2 = 5.0s . Answer the following by considering ratios, without computing the car's velocity. What is the car's position at t = 2.5s ? What will be its ...
*Friday, June 12, 2015 by Tommy*

**Physics**

In a 5.00km race, one runner runs at a steady 11.6km/h and another runs at 15.0km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?
*Friday, June 12, 2015 by Tommy*

**Physics**

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. How tall is the cliff and what is the initial speed of the grasshopper?
*Friday, June 12, 2015 by Sarah*

**Physics**

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. 1) How tall is the cliff? 2) What is the initial speed of the grasshopper?
*Friday, June 12, 2015 by Elliot*

**Physics**

A rookie quarterback throws a football with an initial upward velocity component of 15.4m/s and a horizontal velocity component of 19.5m/s . Ignore air resistance. What is the equation for this graph and how do I find it?
*Friday, June 12, 2015 by Rebekha*

**Physics**

A daring 510-N swimmer dives off a cliff with a running horizontal leap. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?
*Friday, June 12, 2015 by Louis*

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.24 m/s. The car is a distance d away. The bear is 31.1 m behind the tourist and running at 4.50 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*Friday, June 12, 2015 by Beth*

**Physics - Dynamics**

(ZYX)If the coefficient of friction is 0.85 for a 2500 kg car against asphalt, then what applied horizontal friction force would be necessary to decelerate the car at 6.0 m/s^2? Also, what would be the stopping distance if the vehicles original speed is 25 m/s?
*Friday, June 12, 2015 by Nathan*

**unique national comprehensive college**

Physics: an elastic cord can be stretched to its elastic limit by a load of 2N.if a 35cm length of the cord is extended 0.6cm by force of 0.5N,what will be the length of the cord when the stretching force is 2.5N?
*Friday, June 12, 2015 by precious *

**physics**

A river has a steady speed of 0.470 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point
*Thursday, June 11, 2015 by Bishop's High*

**physics**

If the force of the explosion was focused onto a smaller ___________ of the window, then the pressure of the explosion on the window would be even greater.
*Thursday, June 11, 2015 by kim*

**physics**

The pressure in the room also increased when the temperature increased, because pressure is ___________ to temperature.
*Thursday, June 11, 2015 by maya*

**physics**

an artlillery shell is fired with an initial velocity of 325 m/s at 55 degree above the horizontal.It explodes on a mountainside 42 sec after firing.What are the x and y coordinates of the shell where it explodes,relative to its firing point? heres what I got t=325(sin55)/9.8=...
*Thursday, June 11, 2015 by blue28*

**physics**

An object is dropped from a bridge.A second object is thrown downwards 2.00s later.They both reach the water 35.0m below at the same instant.What is the initial speed of the second object? I will be very grateful if someone could help me out Heres what I have so far d=1/2(at^2...
*Thursday, June 11, 2015 by cobalt*

**Physics**

A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?
*Thursday, June 11, 2015 by cooper*

**physics**

A 3 kg book is lifted 5 meters above the floor for 250 seconds. What is the work done?
*Thursday, June 11, 2015 by abby*

**physics**

3) A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?
*Thursday, June 11, 2015 by cooper*

**physics**

2) A diving platform or diving tower has three platforms at 10 m, 7.5 m, and 5.0 m. Some students are going to drop or throw straight down identical balls from each platform and they want the balls to reach the water with the same velocity. The ball from the highest platform ...
*Thursday, June 11, 2015 by julio*

**physics**

When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?
*Thursday, June 11, 2015 by Jojo *

**Physics**

A projectile is fired straight up from the top of a 190m cliff with a speed of 170m/s . What will be its speed just before it strikes the ground below? (Use conservation of energy and neglect air resistance.)
*Thursday, June 11, 2015 by Ali*