Friday

July 29, 2016
**Physics**

A uniform 100-N pipe is used as lever. Where the fulcrum (the support point) must be placed if a 500-N weight at one end is to balance a 200-N weight at the other end? What is the reaction force exerted by the support on the pipe?
*Thursday, July 7, 2016 by ylopez*

**Physics**

A ball of mass 0.1 is thrown against a wall. It strikes the wall normally with a velocity of 30 meter per second and rebounds with a velocity of 20 m/s. Calculate the change in momentum of the ball.
*Thursday, July 7, 2016 by Sahil*

**physics**

research on the physics of living systems.give to examples to show how physics help to understand the concepts of evolution,biological systems of living organisms.
*Thursday, July 7, 2016 by tarun*

**science,physics,chemistry**

According to our theory atomic size should increase in groups from top to bottom but in group 13 Aluminium has atomic radius 143 pm and Gallium has atomic radius 135 pm which is less WHY??????
*Thursday, July 7, 2016 by Neh*

**Physics**

How much heat is required to convert 175 g of ice at -2°C to water at 2°C? I have no idea how to solve this. Nothing I've found in the book or on-line is helping. Can someone point me to how to solve? Thank you
*Wednesday, July 6, 2016 by Anna*

**Physics **

An astronaut wearing a spacesuit can jump 0.5 m vertically at the surface of the earth. The gravitational acceleration on Mars is 0.4 times that on the earth. If her takeoff velocity is the same, how high can the astronaut jump on Mars?
*Wednesday, July 6, 2016 by Mathusha*

**physics**

You have a mass of 69 kg and are on a 57-degree slope hanging on to a cord with a breaking strength of 135 newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire?
*Wednesday, July 6, 2016 by kp*

**physics**

6. Cleo and Clare are looking from their balcony to a swimming pool below that is located 15 m horizontally from the bottom of their building. They estimate the balcony is 45 m high and wonder how fast they would have to jump horizontally to succeed in reaching the pool. What ...
*Wednesday, July 6, 2016 by dario*

**Physics**

How many calories will it take to raise the temperature of a 41 g gold chain from 20°C to 100°C? The answer is 102 calories. I've tried everything and can't come up with that answer. Does someone have any idea what was used for a formula? Thanks
*Wednesday, July 6, 2016 by John*

**Physics**

When a body vertically projected with 200m/s. then velocity of body at490m
*Wednesday, July 6, 2016 by Shiva*

**physics **

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density of copper is 8.95 g/...
*Wednesday, July 6, 2016 by Joe*

**Physics **

During a thunderstorm, a lightning bolt carries current between a cloud and the ground below. If a lightning bolt transports a total charge of 80 C in 0.001 s, what is the magnitude of the average current? A
*Wednesday, July 6, 2016 by Joe*

**physics**

A proton travels at a speed of 2.0..*.10Ò meters/second. Its velocity is at right angles with a magnetic field of strength 5.5..*.10È³ tesla. What is the magnitude of the magnetic force on the proton?
*Wednesday, July 6, 2016 by asdsa*

**science,physics**

The focal length of a mirror is given by 1/f=1/u+1/v where u and v represent object and image distances respectively,The maximum relative error in f is ?
*Wednesday, July 6, 2016 by Neh*

**Physics**

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was 10.5Sin(67.6...
*Tuesday, July 5, 2016 by Michael*

**Physics**

A neutral solid conducting sphere of radius R has charge Q deposited in it, and is sitting at the centre of a conducting shell of inner radius 2R and outer radius 3R. After the conductor reaches equilibrium, find the potential at R<r<2R at r=R, and at r=R/2, and r=5/2R.
*Tuesday, July 5, 2016 by Anonymous*

**Physics **

A 0.142 kg remote control 24.0 cm long rests on a table, as shown in the figure(Figure 1) , with a length L overhanging its edge. To operate the power button on this remote requires a force of 0.355 N . How far can the remote control extend beyond the edge of the table and ...
*Tuesday, July 5, 2016 by Please Help Understand*

**Physics**

The distance between any two points in a thermometer is 10cm.mercury level is 13 cm .temperature in Celsius?
*Tuesday, July 5, 2016 by YEDUKONDALU*

**Physics**

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was 10.5Sin(67.6...
*Tuesday, July 5, 2016 by Michael*

**Physics**

A catapult is launching rocks at your village. It is hiding in a forest. All you can measure is that the rock just passes over an 8 meter tall tree that is 73 meters from the village and that it takes 3 seconds for the rock to arrive from that moment. How far is the catapult ...
*Tuesday, July 5, 2016 by Jay*

**Physics**

A playground merry-go-round of radius R = 1.92m has a moment of inertia of I = 221kgm^2 and is rotating at 14.0rev/min about a frictionless vertical axle. Facing the axle, a 29.8kg child hops onto the merry-go-round and manages to sit down on its edge. What is the new angular ...
*Tuesday, July 5, 2016 by Andrea*

**Physics**

A light, rigid rod 1.039m in length joins two particles with masses 3.65kg and 4.94kg at its ends. The combination rotates in the xy plane about a pivot through the centre of the rod. Determine the angular momentum of the system about the origin when the speed of each particle...
*Tuesday, July 5, 2016 by Helen*

**Physics**

A 2.8 kg duck is swimming at 0.35 m/s and a 3.4 kg goose is swimming at 0.75 m/s. Which bird would make the biggest impact on you if it carelessly swam into you? Explain. I'm not sure where to start. Could I have some help please?
*Tuesday, July 5, 2016 by Lucy*

**Physics**

A ring (hollow cylinder) of mass 2.89kg, inner radius 5.35cm, and outer radius 6.35cm rolls (without slipping) up an inclined plane that makes an angle of θ=35.6°, as shown in the figure below. At the moment the ring is at position x = 1.87m up the plane, its speed is...
*Tuesday, July 5, 2016 by Andrea*

**Physics **

Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-) Please and thank you!!
*Tuesday, July 5, 2016 by Sarah*

**Physics**

An object with an initial velocity of 4 m/s moves along a straight axis under constant acceleration.Three sec later its velocity is 14m/s.How far did it travel during this time? A.27 B.17 C.67 D.57 E.77
*Tuesday, July 5, 2016 by SAGAR*

**Physics**

A ball is rolled off a horizontal roof at 6m/sec , after leaving the roof how long it will take to reach a speed of 10 m/sec? A. 0.20 seconds B. 0.81 seconds C. 1.8 seconds D. 2.5 seconds
*Tuesday, July 5, 2016 by SAGAR*

**PHYSICS**

A BRIDGE IS CONSTRUCTED WITH LUMP OF WOOD 15M LONG ITS PIVOTED AT 2M FROM BOTH ENDS RESPECTIVELY, A THIN AND FAT MAN OF MASSES 30KG & 90KG RESPECTIVELY,STOOD AT POINT A & B,4.5M AND 10M,WHAT IS THE REACTION EXPERIENCED AT THE PIVOT THE BRIDGE
*Tuesday, July 5, 2016 by NIKKI*

**Physics/Mechanics**

Two part Question: A load of 1500N is to be at Height of 3m above the ground. The available Incline planes are 10 degrees and 40 Degrees to the horizontal. Find out the Work Done by effort on the 10 degrees and 40 Degrees ramps. Assume the coefficient of friction is 0.8. Which...
*Tuesday, July 5, 2016 by Jamie*

**Physics**

What is the magnitude of the momentum of a 10,000-kg truck whose speed is 12.0 m/s? What is the kinetic energy?
*Tuesday, July 5, 2016 by mocampo*

**Physics**

A 2.0-kg brick is moving at a speed of 6.0m/s. How large a force F is needed to stop the brick in a time of 7.0x10^-4 s?
*Tuesday, July 5, 2016 by mocampo*

**Physics**

A 23.5 N force acts on a body for duration of 12.0 s. Compute the impulse that the body receives.
*Tuesday, July 5, 2016 by mocampo*

**Physics**

A crane lifts a 1800-kg load of scrap metals to a distance of 15 m in 20 s. how much power is used in delivering the load?
*Tuesday, July 5, 2016 by mocampo*

**Physics**

A roller coaster cart is pulled up to the top of the hill 45 m high before it plunges down to its lowest point, 5 m above the ground. What is the cart’s speed at this point? What is its potential energy if the mass of the object is 5 kg?
*Tuesday, July 5, 2016 by mocampo*

**Physics**

A 2.8 kg duck is swimming at 0.35 m/s and a 3.4 kg goose is swimming at 0.75 m/s. Which bird would make the biggest impact on you if it carelessly swam into you? Explain. I'm not sure where to start. Could I have some help please?
*Tuesday, July 5, 2016 by Lucy*

**math**

if m set of 22 mathematics teachers and p is the set of 25 physics teachers and if 2 teachers both mathematics and physics, how many elements has MUP.
*Tuesday, July 5, 2016 by jb*

**Physics**

A 20 kg slab is to be pulled up a plane inclined 20 degrees with the horizontal at a constant speed by a force that is directed 15 degrees above the surface of the inclined plane. Determine the magnitude of the force necessary to perform the task. The coefficient of friction ...
*Monday, July 4, 2016 by ylopez*

**Physics**

Randy pushes a 30.0 kg box resting on a rough surface by exerting a force of 85.0 N. The box did not move. What is the coefficient of static friction between the box and the surface where it lies?
*Monday, July 4, 2016 by ylopez*

**Physics**

A box with a mass of 10 kg slides along a horizontal surface. A force of 50 N is needed to keep it moving. What is the coefficient of kinetic friction?
*Monday, July 4, 2016 by ylopez*

**Physics**

When a force of 500 N pushes on a 25-kg box, the acceleration of the box up the incline is 0.75 m/s^2. If the inclined plane makes an angle of 40 degrees relative to the horizontal level, what is the coefficient of kinetic friction?
*Monday, July 4, 2016 by ylopez*

**Physics**

How do I figure out how long it takes two runners to have the same momentum if I am given a, m, and Vi for both runners? Runner A= 85kg, 2ms-2, Vi=1ms-1 Runner B= 65kg, 3ms-2, Vi=0ms-2 I don't want an answer, just which equations to use or a hint.
*Monday, July 4, 2016 by Cam*

**Physics**

A ring (hollow cylinder) of mass 2.89kg, inner radius 5.35cm, and outer radius 6.35cm rolls (without slipping) up an inclined plane that makes an angle of θ=35.6°, as shown in the figure below. At the moment the ring is at position x = 1.87m up the plane, its speed is...
*Monday, July 4, 2016 by Tim*

**Physics**

An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely melted. After a further 6.0 min of heating, ...
*Monday, July 4, 2016 by John Carlo *

**Physics **

In physics what does ω unit represent? rad/s ???
*Monday, July 4, 2016 by Boboerto*

**Physics**

Q. A mass is sliding down an incline. As the angle for the incline increases, the magnitude of the component of weight perpendicular to incline:- Increases Decreases Increase then decrease Decrease then increase
*Monday, July 4, 2016 by SAGAR*

**Physics**

Q. The time period of seconds pendulum in a free falling elevator is Zero 1s 2s Infinity Depends upon mass of pendulum
*Monday, July 4, 2016 by SAGAR*

**Physics**

An ion beam has a cross-sectional of 2.5 mm^2 and the charge delivered by it to a target can be expressed as q(t)=(.12 C/s^3)t^3 + (.24 C/s^2)t^2 - .45 C. Calculate the current density in the beam at t = 3.0 seconds. I used an integral from 0 to 3s. and got 3.24C, then I ...
*Monday, July 4, 2016 by Zabe*

**Physics**

A 6.0 V battery is being used to charge a 5.0x10^-6 F capacitor through a resistor R. The capacitor attains a potential difference of 3.6 V in 1 second after the charging begins. The value of the resistance R is? Been stuck on this for a while and if anyone can point me into ...
*Monday, July 4, 2016 by Zabe*

**physics**

a uniform rod 100cm long and weighing 50N is supported in a horizontal position on a fulcrum with weights 80N and 100N suspended from its end. compute the position of a fulcrum.draw the illustration.
*Monday, July 4, 2016 by joshua*

**physics**

A flywheel is rotating at speed of 1200 rpm its angular acclaration is 4 rad/s how many rotation it will be done before coming to rest
*Sunday, July 3, 2016 by Rushi mudgal*

**Physics**

I've tried everything and can't come up with the correct answer. Help! A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 4 L of water?
*Sunday, July 3, 2016 by John*

**Physics**

In the figure, a small 0.125 kg block slides down a frictionless surface through height h = 0.958 m and then sticks to a uniform vertical rod of mass M = 0.250 kg and length d = 2.32 m. The rod pivots about point O through angle θ before momentarily stopping. Find θ.
*Sunday, July 3, 2016 by Andy*

**Physics**

The terminal voltage of a battery is 5.0V when 0.55A current is drawn from it, whereas the terminal voltage is 5.7V when a current of 0.180A is drawn. The emf of the battery is? The formula I used was V_(ab) = Emf - I*r First finding the r by taking the differences of voltage ...
*Sunday, July 3, 2016 by Amid*

**Physics**

An ion beam has a cross-sectional of 2.5 mm^2 and the charge delivered by it to a target can be expressed as q(t)=(.12 C/s^3)t^3 + (.24 C/s^2)t^2 - .45 C. Calculate the current density in the beam at t = 3.0 seconds. I used an integral from 0 to 3s. and got 3.24C, then I ...
*Sunday, July 3, 2016 by Amid*

**Physics**

Find the torque on the meter stick for each situation. Ignore the mass of the meter stick. At 1/2 meter there is a 1000g weight. At 1 meter on the same stick there is a 500g weight. What is the torque? Not understanding how to come up with this answer. Keep getting it wrong.
*Sunday, July 3, 2016 by John*

**Physics**

I've looked at other questions posted like this and can't understand the problem or any of the answers. Could someone please show how to find for Cliff and Will? Cliff and Will are carrying a uniform 2.0m board of mass 75kg. Will is supporting the board at the end ...
*Sunday, July 3, 2016 by Katie*

**physics**

Cliff and Will are carrying a uniform 2.0m board of mass 75kg. Will is supporting the board at the end while cliff is 0.6m from the other end as shown in the following figure. Cliff has attached his lunch to his end of the board, and the tension in the string supporting the ...
*Sunday, July 3, 2016 by Leslie*

**Physics**

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 33 cm and x2 = 12 cm.)
*Sunday, July 3, 2016 by Annabelle*

**Physics**

A car comes to a stop in 6s from a velicity of 30m/s. what is its acceleration? At the same acceleration, how long would it take the car to come to a stop from a velocity of 40m/s?
*Sunday, July 3, 2016 by Laarni jhuzel Navidad*

**physics**

4N force applied on a body mass 20kg then calculate work done in 3sec?
*Sunday, July 3, 2016 by rohit*

**Physics**

An 11N force acting due north and a 22-N force acting 30° North of east act concurrently on a point. What is the equilibrant force at that point? I'm having such a hard time.=(
*Saturday, July 2, 2016 by Marvin*

**PHYSICS**

a block of a material of volume 20cmand density 2.5cm is suspended frm a spring balance wit half of the vol of the block immersed in a water,what is the reading of a spring balance?
*Saturday, July 2, 2016 by ZAKKA*

**Physics**

What % increase in momentum if increase of k.e is 23% A. 46% B. 33% C. 50% D. 11% E. 46%
*Saturday, July 2, 2016 by SAGAR*

**physics**

Rain drops fall on a tile surface at a density of 4585 drops/ft2 . There are 15 tiles/ft2 . How many drops fall on each tile? Answer in units of drops/tile.
*Saturday, July 2, 2016 by imani*

**physics**

A novice captain is pointing his ferryboat directly across the river at a speed of 15.7 mi/h. If he does not pay attention to the current that is headed downriver at 5.35 mi/h, what will be his resultant speed and direction? (Consider that the current and the boat’s ...
*Saturday, July 2, 2016 by hassan yousif*

**Physics**

A planet with density equal to Earth is 2R times far away from earth, if we double the distancs from 2R to 4R then "g" becomes:-
*Saturday, July 2, 2016 by Sagar*

**physics**

A swimming pool of width 9.0 m and lenght 24.0 mis filled with water to a deepth of 3.0 m force 1215 m.Calculate pressure on the bottom of the pool due to the water
*Saturday, July 2, 2016 by Deek!@#$%^&haa*

**physics**

Two forces 5N &10N are acting at an angle of 120° between them. Find the resultant force in magnitude and direction.
*Saturday, July 2, 2016 by sai*

**physics**

As a movie stunt coordinator, you need to be sure a stunt will be safe before it is performed. If a stunt- woman is to run horizontally off the roof of a three-story building and land on a foam pad 7.35 m away from the base of the building, how fast should she run as she ...
*Saturday, July 2, 2016 by hassan yousif*

**physics**

As a newspaper delivery boy, Jason needs to know his projectile motion to throw a paper horizontally from a height of 1.40 m to a door that is 13.5 m away. What must the paper’s velocity be for it to reach the door?
*Saturday, July 2, 2016 by hassan yousif*

**physics**

A novice captain is pointing his ferryboat directly across the river at a speed of 15.7 mi/h. If he does not pay attention to the current that is headed downriver at 5.35 mi/h, what will be his resultant speed and direction? (Consider that the current and the boat’s ...
*Saturday, July 2, 2016 by hassan yousif*

**Physics**

A potter's wheel—a thick stone disk with a radius of 0.420m and a mass of 120kg—is freely rotating at 53.0rev/min. The potter can stop the wheel in 5.50s by pressing a wet rag against the rim and exerting a radially inward force of 79.4N. Calculate the effective ...
*Saturday, July 2, 2016 by Tim*

**Physics/Chem**

A cube of aluminum 24.0 cm on each side is cooled from 128 °C to 20 °C. If the energy removed from the aluminum cube were added to a copper cube of the same size at 30 °C, what would be the final temperature of the copper cube?(ρAl = 2700 kg/m³; ρ...
*Friday, July 1, 2016 by Jeff Kinka*

**Physics/Chem**

an experiment, a 0.280-kg piece of ceramic superconducting material at 23 °C is placed in liquid nitrogen at its boiling point (−195.8 °C) to cool. The nitrogen is in a perfectly insulated flask that allows the gaseous N2 to escape immediately. How much mass of ...
*Friday, July 1, 2016 by Jeff Kinka*

**Physics**

What is the rotational speed of the Second Hand on a clock. Note, the answer must be in rev/s. The Hour Hand is 2.31e-05 rev/s; The Minute Hand is 2.78e-4 rev/s. I've checked with 3 tutors and none of them have gotten an answer that is considered correct. I'm ...
*Friday, July 1, 2016 by Annabelle*

**physics**

If an hour hand is .01667 rev/s, a minute hand is 2.78e-4 rev/s, what is the second hand rotation speed? I've tried everything and can't get a correct answer. Thank you
*Friday, July 1, 2016 by Anna*

**physics**

To protect her new two-wheeler, Iroda Bike buys a length of chain. She finds that its linear density is 0.62 lb/ft. If she wants to keep its weight below 1.6 lb, what length of chain is she allowed? Answer in units of ft.
*Friday, July 1, 2016 by imani*

**physics**

A plastic tube allows a flow of 11.3 cm3 /s of water through it. How long will it take to fill a 245 cm3 bottle with water? Answer in units of s
*Friday, July 1, 2016 by imani*

**physics**

A group of soldiers walked 15km north from their camp then covered 10km more due east. 1. What is the total distance walked by the soldiers? 2. Define the displacement?
*Friday, July 1, 2016 by geobon*

**physics**

The angle of elevation of a tree at a place 80m away is 12 degree 5 minute.what is a height of tree?
*Friday, July 1, 2016 by yash patwa*

**Physics**

A stone is dropped from the root of a building. A person in the building observes that the stone crosses his window that is 2 meters tall in a time of 0.2 second. How far is the roof from the top of the window?
*Thursday, June 30, 2016 by Joe*

**physics**

A cyclist is attached to a rope which is looped over a pulley (disc of mass 10kg and radius 0.5m). The rope is then attached to a hanging block of mass 5kg. What force must the cyclist generate such that the block will move with an acceleration of 2.25 m/s2. Let’s make ...
*Thursday, June 30, 2016 by sam*

**science (physics)**

how far will a stone travel over level ground if it is thrown upward at an angle 30 with the horizontal and with a speed of 12m/s?what maximum range could be achieved with the same initial speed?
*Thursday, June 30, 2016 by tena*

**science physics**

a force acted upon a body by 3 given force is under equilibrium if f1 =10n and f2 =6n find f3 and angle
*Thursday, June 30, 2016 by vaani*

**physics**

A ball reaches the ground at 6 seconds when thrown vertically upwards from the top of a tower with an inoitial velocity 24m/s. Find the height of the tower.
*Thursday, June 30, 2016 by kowalski*

**physics**

A cyclist is attached to a rope which is looped over a pulley (disc of mass 10kg and radius 0.5m). The rope is then attached to a hanging block of mass 5kg. What force must the cyclist generate such that the block will move with an acceleration of 2.25 m/s2. Let’s make ...
*Thursday, June 30, 2016 by sam*

**physics**

The contestants at a cycling race travel around a 0.5km radius track. The peloton travels 33 laps in 1 hour to complete the race. What is the total angular distance they have traveled? On the first lap, they start from rest and after traveling ½ the circumference of the...
*Thursday, June 30, 2016 by dave*

**physics**

A cyclist is on a rolling stationary trainer pedaling such that his wheels are traveling at 30 km/h. He has an unfortunate incident and ends up falling over 90° on his side onto a large patch of ice. Given the cyclist and bicycle have an 4.5 kg*m^2, find the angular ...
*Thursday, June 30, 2016 by joe*

**Physics**

a man can swim with a speed of 4 km per hr in still water. How long does he take to cross a river 1 km wide if the river flows steadily at 3 km per hr and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank? Ans: ...
*Thursday, June 30, 2016 by Student*

**physics**

A particle A having a charge of 2×10^-6 Coulomb and a mass of 100g is fixed at the bottom of a smooth inclined plane of inclination 30 degree. Where should another particle B having same charge and mass, be placed on the inclined plane so that B may remain in equilibrium...
*Thursday, June 30, 2016 by anonymous 111*

**physics**

A motorcycle/rider combination has a center of mass that is half a meter diagonally upward and in front of the point of contact between the wheel and the road at an angle of 30 degrees when the bike is level. What acceleration is necessary to keep the bike tilted up stably ...
*Wednesday, June 29, 2016 by Anonymous*

**Physics**

A 0.2kg toy car rolls down a ramp with a height of 0.7m. What is the speed of the car at the bottom of the ramp. At the bottom it hits a stationary car with a mass of .4 kg. The two cars have velcro bumpers and stick together. At what speed do the two cars move after the ...
*Wednesday, June 29, 2016 by Anna*

**Physics**

Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object does and the angle of ...
*Wednesday, June 29, 2016 by Nelson*

**Physics**

A satellite orbits the Earth with a radius of 7000km. The acceleration of gravity at this distance=8.17m/s/s. How do I find the velocity of the satellite? I'm really struggling with finding the correct formula. I know the answer but can't figure out how to get there. ...
*Wednesday, June 29, 2016 by Leslie*

**physics**

a stone is projected vertically upward and reaches a maximum height of 20m before it returns to the thrower find the total time taken
*Wednesday, June 29, 2016 by gunjan*

**Physics**

A rock falls off the edge of a cliff that is 145 m above the ground beneath it. For how long a time is the rock falling? Assume air resistance is negligible. A. 4.9 s B. 2.9 s C. 4.5 s D. 3.3 s E. 5.4 s
*Wednesday, June 29, 2016 by Karri*

**Physics**

What is the acceleration of a car that goes from 20 to 30 km/h in 1.5s? At the same acceleration, how long will it take the car to go from 30 to 36 km/h?
*Wednesday, June 29, 2016 by Yoongi*

**Physics**

I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...
*Wednesday, June 29, 2016 by Anna*

**Physics**

What is the acceleration of a car that goes from 20 to 30 km/h in 1.5s? At the same acceleration, how long will it take the car to go from 30 to 36 km/h?
*Tuesday, June 28, 2016 by Yoongi*

**Physics**

I'm really struggling trying to understand what formulas to use for the following: A satellite orbits the earth with a radius of 7000 km. (a) what is the acceleration of gravity at this distance? (b) what is the velocity of the satellite? (c) how long does it take the ...
*Tuesday, June 28, 2016 by Anna*