Monday

May 2, 2016
**Physics**

A pendulum clock can be approximated as a simple pendulum of length 1.03 m and keeps accurate time at a location where g = 9.82 m/s2. In a location where g = 9.77 m/s2, what must be the new length of the pendulum, such that the clock continues to keep accurate time (that is, ...
*Tuesday, April 12, 2016 by Emily*

**PHYSICS **

A 2000kg elevator is attached to a 1800kg counterweight. What power must the motor supply to raise the elevator at 0.4m/s?
*Tuesday, April 12, 2016 by a*

**physics**

what will be the speed of a 500 kilogram moving satellite if we apply100N force on it after each second till 10 hours and current velocity of this satellite is 16,800 miles per hour?
*Tuesday, April 12, 2016 by vikram*

**11th grade physics**

A parallel condenser of 0.8F is to be constructed using sheets of tin foil each 30cm.25cm and separated by a paraffin waxed paper 0.015cm thick of dielectric constant Find how many sheets of metals are required?
*Tuesday, April 12, 2016 by angy*

**11th grade physics**

How do we know which plate has an excess of electrons?
*Tuesday, April 12, 2016 by angy*

**Physics**

The Equation of Continuity states that the mass flow rate has the same value at every position along a tube that has a single entry and a single exit point for fluid flow. Basically it boils down to the idea that the fluid doesn’t magically disappear or appear. If 2.0 kg ...
*Tuesday, April 12, 2016 by Rachel*

**Physics**

A metal block of mass 1.840 kg is hanging from a string. The tension in the string is 9.972 N. The block is submerged in a beaker of fluid and is stationary. What is the magnitude and direction of the buoyant force acting on the block? Consider making a free body diagram ...
*Tuesday, April 12, 2016 by Rachel*

**physics**

The period of an ocean wave is 20 seconds. Calculate the wave's frequency.
*Tuesday, April 12, 2016 by Anonymous*

**physics**

If you launch a marble out of a launcher on a table with a given angle, and you know that range( distance it travelled) and time travelled ( if needed). The only force acting upon is gravity. How would you find the initial speed or velocity of the launcher? Is there a formula?
*Tuesday, April 12, 2016 by anon*

**Physics**

A child is pushed down a slide from a height of 2.5m with a speed of 7m/s if his mass is 25kg and reaches the ground a speed of 5m/s calculate the coefficient of kinetic friction. Theta = 55 degrees
*Tuesday, April 12, 2016 by Hajju Farouk *

**Physics**

A stone is short-cut from a catapult with an initial velocity of 20m/s atan elevation of 40.calculate the velocity of nove height
*Tuesday, April 12, 2016 by Raphael*

**PHYSICS Momentum!! Collision HELP**

A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment only, can I simply ...
*Tuesday, April 12, 2016 by Pam*

**physics**

Argon is a monatomic gas whose atomic mass is 39.9 u. The temperature of eight grams of argon is raised by 95 K under conditions of constant pressure. Assuming that argon behaves as an ideal gas, how much heat is required?
*Monday, April 11, 2016 by jose*

**PHYSICS Collision of two Balls Momentum!! HELP**

A ball A of mass .202 kg is moving at a velocity of 2.0 m/s toward a ball B that is at rest. (a) Calculate the initial momentum for Ball A and Ball B. (b) Calculate initial Kinetic energy for Ball A and Ball B. My doubt since its asking for initial moment only, can I simply ...
*Monday, April 11, 2016 by Pam*

**Physics**

How high would you have to lift a 0.294N mouse to do the same amount of work that you would do if you lift a 6.87 kN elephant 1.00cm?
*Monday, April 11, 2016 by Chad*

**Physics**

A photon of light has a wavelength of about 600 nm (1nm = 1 x 10-9 m). What is the energy of this photon of light? how do I solve this step by step?
*Monday, April 11, 2016 by Alea*

**PHYSICS HELP!!**

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...
*Monday, April 11, 2016 by Ben*

**Physics **

a lawnmower with a mass of 12 kg is being pushed by a force of 150n horizontally and 40 n down. if the kinetic coefficient of friction between the grass is 0.9, find the force of friction on the lawnmower. Please explain this as well, I am getting an answer but I don't know.
*Monday, April 11, 2016 by lomonoyan*

**Physics**

Imagine a vessel containing 2.000 kg of liquid whose specific heat equals 1.50 kcal/kg/°c. Suposse that all of the liquid exists at its vaporization temperature of 450 k. We transfer 150 cal of heat energy to the liquid. What is the temperature of the liquid in the vessel ...
*Monday, April 11, 2016 by Jazz*

**Physics**

What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium vapor devices?
*Monday, April 11, 2016 by Brianna*

**Physics**

Suppose the thickness of an oil film on water is just the right thickness for canceling red light. What color will your eye see? Explain using 3 – 4 complete sentences. Would I see all the colors except for red? Or would I just see the color green? I am not sure
*Monday, April 11, 2016 by Alea*

**Physics**

An electron is held 2.10 cm from an vertically aligned infinite charged plane and then released from rest. It accelerates toward the plane to the left and collides with a speed of 1.50×107 m/s .
*Monday, April 11, 2016 by James*

**Physics**

Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
*Monday, April 11, 2016 by Alea*

**Physics**

Along solenoid is wound with 500 turns permeter and the current in its windings is increasing at rate of 20A/s .If the cross sectional area of solenoid 5cm^2.what will be the rate change of magnetic flux
*Monday, April 11, 2016 by Ermias*

**Physics 101**

on a uniform beam of length 5m, hangs a mass 30kg at one end. the beam then balances at a point 1.5m from this end. find the mass of the beam(g=10ms-1)
*Monday, April 11, 2016 by DOLAPO*

**PHYSICS!!**

Squids and octopuses propel themselves by expelling water. They do this by taking the water into a cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees ...
*Monday, April 11, 2016 by Jessica*

**PHYSICS!!**

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...
*Monday, April 11, 2016 by tom*

**physics**

A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...
*Monday, April 11, 2016 by anna*

**physics**

A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
*Monday, April 11, 2016 by anna*

**physics**

A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm . For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F? I keep doing this but I do not think ...
*Monday, April 11, 2016 by jessica*

**Physics**

You’re riding your bicycle first west a distance of 7.7 km, then south a distance of 14.1 km. (a) In what direction does your average velocity vector point, in degrees south of west? (b) If the total trip took 18.3 minutes, what is the magnitude of this average velocity, ...
*Monday, April 11, 2016 by Bira*

**Physics**

A volleyball is sent over a net, having been launched at a speed 4.6 m/s at an angle 28.2 degrees above the horizontal, from the ground. What is the maximum height, in m, that the net can be placed such that they ball can make it over?
*Monday, April 11, 2016 by Bira*

**Physics**

A ball is tossed upward and returns to its original position after 19.7 seconds. If another ball is thrown at an angle of 41.4 degrees above the horizontal, at what speed, in m/s, must it be thrown such that it returns to the same height at the same time as the first ball?
*Monday, April 11, 2016 by Bira*

**Physics**

James Bond is chasing a runaway villain across the tops of several buildings. In order to make it from one building to another safely, Bond needs you to calculate how much horizontal speed he needs to jump from one building’s roof to another, with the horizontal distance ...
*Monday, April 11, 2016 by Bira*

**Physics**

A baseball is hit and leaves the bat horizontally at a speed of 6.7 m/s. The ball lands 10.3 m from where it was hit. What was the height of the bat at the time it hit the baseball, in m?
*Monday, April 11, 2016 by Bira*

**Physics**

A volleyball is sent over a net, having been launched at a speed 5 m/s at an angle 42.7 degrees above the horizontal, from the ground. What is the ball’s speed, in m/s, 2.97 seconds after being launched?
*Monday, April 11, 2016 by Bira*

**Physics**

An egg is thrown from the top edge of a 22.9 m high building down onto an unsuspecting person standing on the ground 6.2 m from the base of the building. If the egg is tossed horizontally, at what speed, in m/s, must the egg be thrown such that it lands on the person?
*Monday, April 11, 2016 by Bira*

**Physics**

A 1.4 kg box that is sliding on a frictionless surface with a speed of 10 m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. (a) How far will the spring be compressed in stopping the box? (b) How far will the spring be compressed when the box'...
*Sunday, April 10, 2016 by michael*

**Physics**

A 1100 kg safe is 2.0 m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 40 cm. What is the spring constant of the spring? I don't understand what to do here
*Sunday, April 10, 2016 by tom*

**Physics**

A flying squid (family Ommastrephidae) is able to "jump" off the surface of the sea by taking water into its body cavity and then ejecting the water vertically downward. A 0.80 kg squid is able to eject 0.32 kg of water with a speed of 20 m/s. (a) What will be the ...
*Sunday, April 10, 2016 by xxxxxxx*

**Physics**

A proton, moving with a velocity of vii, collides elastically with another proton that is initially at rest. Assuming that after the collision the speed of the initially moving proton is 1.50 times the speed of the proton initially at rest, find the following.
*Sunday, April 10, 2016 by Dance Queen *

**physics**

A window air conditioner consumes 900 W of electric power and has COP = 2.9.If it runs continuously for 24 h , how much heat gets removed from the house?
*Sunday, April 10, 2016 by lizbeth*

**Physics**

A 3.10 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 43.5 N. What is the coefficient of kinetic friction between the block and the floor? I tried dividing the N by the KG and vise versa but it didn't work
*Sunday, April 10, 2016 by xxxxxxx*

**Physics**

An ideal spring hangs vertically from the ceiling. When a 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the ...
*Sunday, April 10, 2016 by Joane *

**physics**

Consider the circuit shown below. Assume that the op-amp is ideal. fa2014_fn_diode_opamp2.png Figure 3-1 The diode has the following I-V characteristics: iD=Is*(e^(vD/vth)-1) where iD is the current through the diode,( Is ) is the reverse bias saturation current Vd is the ...
*Sunday, April 10, 2016 by bearinthewoods*

**Physics**

Einswine has a mass of 300 kg. He sits on an ideal spring. Before he sits on the spring it is 2 m tall. After he sits on the spring it is only 1.5 m tall. What is the spring constant of the spring?
*Sunday, April 10, 2016 by joane *

**physics**

A light spring of constant k = 95.0 N/m is attached vertically to a table (figure (a)). A 2.70-g balloon is filled with helium (density = 0.179 kg/m3) to a volume of 4.00 m3 and is then connected to the spring, causing the spring to stretch as shown in figure (b). Determine ...
*Sunday, April 10, 2016 by anna*

**physics**

given the following apparatus; retort stand,stone,thread,spring balance,water,beaker and kerosine.using Archimede's principle, describe a simple experiment on how to determine the density of kerosine.
*Sunday, April 10, 2016 by kelechi*

**physics**

A 1.00-kg beaker containing 2.29 kg of oil (density = 916 kg/m3) rests on a scale. A 2.33-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below). Find the equilibrium readings of both scales. top scale N bottom scale N
*Sunday, April 10, 2016 by anna*

**physics**

Piston circled 1 in the figure below has a diameter of 0.28 in.; Piston circled 2 has a diameter of 1.6 in. In the absence of friction, determine the force vector F necessary to support the 500-lb weight. in lb i got 1.53 lb but it is incorrect
*Sunday, April 10, 2016 by anna*

**College Physics 1 (Algebra-based)**

Calculate the force required of the "deltoid" muscle, Fm, to hold up the outstretched arm shown in the figure below. The total mass of the arm is 3.31kg. Assume that alpha = 15.2°, d = 12.0 cm and D = 24.0 cm. Figure: tinyurl com/hszqaqw Any help (at least how to...
*Sunday, April 10, 2016 by collegegirl*

**PHYSICS!!**

Two basketball players collide head on. play a weighs 80 kg and is travelling 2.5m/s to the right while player b weighs 68 kg and is travelling 1.2 m/s to the left. after collision player a is travelling at 1.0 m/s to the right. a. what is the change in momentum of player a? b...
*Sunday, April 10, 2016 by tom*

**Physics CENTER OF MASS**

A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
*Sunday, April 10, 2016 by Jesse*

**HELP PHYSICS!! WORK**

How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6?
*Sunday, April 10, 2016 by Emma*

**PHYSICS work on a ramp!!!**

How much work is it to push a box (mass 190 kg) up an incline (angle 16 degrees with the horizontal) that is 8.3 meters long, if the coefficient of kinetic friction between the box and the incline is 0.6? My doubt is how do I find force?
*Sunday, April 10, 2016 by Matt*

**Energy of satellite PHYSICS**

An m = 43 kg mass instrument package is put into orbit at an altitude above the Earth of A = 23000 km. What is the kinetic energy of this satellite in Joules?
*Sunday, April 10, 2016 by Stephanie*

**PHYSICS CENTER OF MASS**

A thin rectangular plate of uniform areal density σ = 2.79 kg/m2 has length of 37.0 cm and width of 23.0 cm. The lower left hand corner is located at the origin, (x,y)= (0,0) and the length is along the x-axis. (a)There is a circular hole of radius 8.00 cm with center at...
*Sunday, April 10, 2016 by Nancy*

**Physics projectile**

If a body projected vertically upwards, give a graph showing variation in its kinetic energy
*Sunday, April 10, 2016 by Anonymous*

**Quick Physics help**

1. What is the medium for waves on a rope? 2. What is the medium for earthquake waves? 3. A characteristic of waves is that after the wave has passed the medium is (disturbed, undisturbed) is this disturbed? 4. A cork is floating in the water 20 m from the shore of a lake. No ...
*Sunday, April 10, 2016 by Anonymous *

**Physics**

A ball is thrown from the ground toward a cliff of height h with a speed of 30.0 m/s and an angle of 60o above horizontal. It lands on the cliff 4.00 s later. How high is the cliff? Answer: 25.5 m But having difficulty getting this answer
*Sunday, April 10, 2016 by Sarah*

**Physics **

The amount of radiant power produced by the sun is approximately 3.9 x 1026 W. Assuming the sun to be a perfect blackbody (e = 1) sphere with a radius of 6.96 x 108 m, find its surface temperature (in kelvins).
*Sunday, April 10, 2016 by Akeneta *

**PHYSICS ENERGY CONSERVATION!!**

The car shown in the figure has a mass of 395 kg when it passes through point A with a speed of 17.7 m/s, being the height of A 7.2 m above the ground (y = 0). In the instant that passes through C its speed is diminished to 7.6 m/s. Assuming that the path has no friction (a) ...
*Sunday, April 10, 2016 by Malcolm*

**Physics**

You take a trip in your car. Starting from rest, you accelerate at 1.00 m/s2 for 10.0 s, heading north. You then stop accelerating and immediately head west at a constant speed for an additional 20.0 s, at which point, you crash into a building coming to an instant stop. At ...
*Sunday, April 10, 2016 by sarah*

**Physics**

A 25 kg box is along a horizontal floor and a force of 400 N pushes the box with an angle of 50 degree with the horizontal. Starting from rest, the box achieves a velocity of 2 m/s in a time of 4 seconds. Find the coefficient of sliding friction between the box and the floor. ...
*Sunday, April 10, 2016 by Shekinah*

**physics**

A mass m = 0.068 kg of benzene vapor (Lv = 3.94x105 J/kg) at its boiling point of 80.1°C is to be condensed by mixing with water at 45.0°C. What is the minimum mass of water required to condense all of the benzene vapor? Assume the mixing and condensation take place is...
*Sunday, April 10, 2016 by jose*

**physics**

A golf ball is hit at a velocity of 30 m/s at an angle of 40˚ from the ground. a.) How high will the golf ball rise? b.) How long will it take for it to hit the ground? c.) How far will it go?
*Sunday, April 10, 2016 by suzie*

**physics**

A ball is thrown horizontally from a height of 100 m. It covered a horizontal distance of 3,350 m when it touches the ground. a. What is its horizontal velocity? b. How many seconds after it was fired will it touch the ground? c. What was its vertical velocity when it hits the...
*Sunday, April 10, 2016 by suzie*

**physics**

A bullet with a muzzle velocity of 200 m/s is fired horizontally from a rifle mounted on top of a window ledge 7.8 m from the ground. a.) How long will it take to hit the ground? b.) What is the range of the bullet?
*Sunday, April 10, 2016 by suzie*

**physics**

Two electrically-charges spheres are suspended from insulated threads a certain distance from each other. There is a certain amount of electrostatic force between them. Describe specifically (not just increase or decrease) what happens to this force in each of the scenarios ...
*Saturday, April 9, 2016 by taylor*

**Physics**

An 80 kg hunter gets a rope around a 400 kg polar bear. They are stationary and on frictionless level ice, initially 60 m apart. When the hunter pulls the polar bear to him, the polar bear will move: 1. 10 m 2. 30 m
*Saturday, April 9, 2016 by PLS HELP!!*

**Physics**

Please how do i get an answer to this answer that goes like this a wire of length 5.0m and diameter 2.0cm extends by 0.25mm when a force of 50n was used on its end. Calculate (i) stress (ii) strain in the wire (pi=3.142)
*Saturday, April 9, 2016 by Manuel*

**Physics**

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically (see figure below). A drop that breaks loose from the tire on ...
*Saturday, April 9, 2016 by A.G.*

**Physics**

Q1. What is the working principle of the loudspeaker. Q2.Explain the following:- 1.Beat 2.Shock wave 3.Mach effect.
*Saturday, April 9, 2016 by Jamilu.*

**physics**

Consider air to be a mixture of 80% nitrogen and 20% oxygen. How much work is required to raise the temperature of 7 mol of air by 9 ∘C in an adiabatic process?
*Saturday, April 9, 2016 by lizbeth*

**Physics**

the current in an rc circuit if the resistance is 20 ohms the capacitance is 0.002 farad the emr is 12e^-10t
*Saturday, April 9, 2016 by fatimaaa*

**physics**

A 58 kg skier has a speed of 9.5 m/s at point A. She then encounters a 1.75 m deep dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.
*Saturday, April 9, 2016 by rocky*

**physics**

The lightbulb in the circuit shown in the figure has a resistance of 14 Ω and consumes 4.2 W of power; the rod is 1.18 m long and moves to the left with a constant speed of 2.9 m/s . The strength of the magnetic field is 2.2 T . Find the current that flows in the circuit...
*Friday, April 8, 2016 by jacob*

**Physics**

The isotope, Carbon-14 emits beta radiation and has a half live of 5730 years. How long will it take for the amount of radiation this gives off to drop by a factor of 4?
*Friday, April 8, 2016 by Alea*

**Physics**

The total U.S. consumption of electricity in a particular year was 5.0 x 10^12 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer. How would I solve it?
*Friday, April 8, 2016 by Alea*

**physics- help me please **

The pressure at the bottom of a glass filled with water (ρ = 1000 kg/m3) is P. The water is poured out and the glass is filled with mercury (ρ = 13.6 ✕ 103 kg/m3). The pressure at the bottom of the glass is now which of the following? a)equal to P b)smaller ...
*Friday, April 8, 2016 by anna*

**physics- help me please**

Suppose you have two cubic meters of uranium, four cubic meters of lead, four cubic meters of copper. Rank them by mass, from smallest to largest. a)lead, copper, uranium b)uranium, copper, lead c)copper, uranium, lead d)uranium, lead, copper can someone help me
*Friday, April 8, 2016 by anna*

**physics**

What is the maximum walking speed of an adult man whose legs are each 1.2 m long?
*Friday, April 8, 2016 by aram*

**Physics **

An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. How high does it rise (v = 0 cm/s at top of rise). Remember, acceleration is -9.80 m/s2.
*Friday, April 8, 2016 by emanuel*

**physics**

Find dy/dx when y=e^nx
*Friday, April 8, 2016 by pankaj*

**Physics**

You throw a baseball at a 45∘ angle to the horizontal, aiming at a friend who's sitting in a tree a distance h above level ground. At the instant you throw your ball, your friend drops another ball. The two balls will collide, no matter what your ball's initial ...
*Friday, April 8, 2016 by Megan*

**Physics**

An arrow fired horizontally at 45 m/s travels 26 m horizontally. From what height was it fired?
*Friday, April 8, 2016 by Megan*

**Physics**

A flock of geese is attempting to migrate due south, but the wind is blowing from the west at 5.4 m/s . If the birds can fly at 7.9 m/s relative to the air, what direction should they head?
*Friday, April 8, 2016 by Megan*

**Physics**

The position of an object as a function of time is r⃗ =(3.2t+ 1.8 t2)i^+(1.7t− 2.4 t2)j^m, where t is the time in seconds. Find the object’s magnitude of the acceleration. What is the direction of the acceleration?
*Friday, April 8, 2016 by Megan*

**Physics**

An ice skater is gliding along at 2.1 m/s , when she undergoes an acceleration of magnitude 1.4 m/s2 for 3.0 s. After that she's moving at 6.3 m/s . Find the angle between her acceleration vector and her initial velocity vector.
*Friday, April 8, 2016 by Megan*

**Physics**

You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 88 km/h collided with a slower train traveling in the same direction at 22 km/h . Your job is to determine the relative speed of the collision, to ...
*Friday, April 8, 2016 by Megan*

**physics **

A particular wire, fixed at both ends, "resonates" in 2 "loops" and has a frequency of 102 Hz. What is the fundamental frequency?
*Friday, April 8, 2016 by Jac*

**physics **

The length of the B string on a certain guitar is 60.0 cm. It vibrates at a fundamental frequency of 246.0 Hz. What is the speed of the transverse waves on the string?
*Friday, April 8, 2016 by Jac*

**physics **

Periodic waves spread out over the surface of a lake where two women, Jenny and Melissa, are fishing in separate boats 65 meters apart. Each woman's boat bobs up and down 19/min. At a time when Jenny's boat is at a crest, Melissa's boat is at its lowest point, and ...
*Friday, April 8, 2016 by Jay*

**Physics**

You can run 8.0 m/s , 20% faster than your brother. How much head start should you give him in order to have a tie race over 90 m ?
*Friday, April 8, 2016 by Megan*

**Physics**

You allow yourself 34 min to drive 26 mi to the airport, but you're caught in heavy traffic and average only 15 mi/h for the first 13 min . What must your average speed be on the rest of the trip if you're to make your flight?
*Friday, April 8, 2016 by Megan*

**Physics**

A rock is thrown directly upward from the edge of the roof of a building that is 40.2 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the...
*Friday, April 8, 2016 by Megan*

**physics **

Two tuning forks are sounded together. One has a frequency of 741 Hz and the other a frequency of 715 Hz. Calculate the beat frequency that would be produced.
*Friday, April 8, 2016 by Jay*

**physics **

A 3580 Hz tuning fork is sounded at the same time that a note on a piano is struck. You hear 8 beats/s. You loosen the string slightly and now hear 12 beats/s. What is the frequency of the vibrating piano string now after the loosen ing?
*Friday, April 8, 2016 by Jay*

**Physics**

In a chase scene, a movie stuntman runs horizontally off the flat roof of one building and lands on another roof 2.0 m lower. If the gap between the buildings is 4.8 m wide, how fast must he run to cross the gap?
*Friday, April 8, 2016 by Megan*

**physics **

How much will it cost you (in cents) to operate a 29 Ω electric skillet on a standard 120 V outlet for 5 hours and 36 minutes? The unit price for electrical energy in this case is 7.350 cents/kWh.
*Friday, April 8, 2016 by Jay*