Monday

August 29, 2016
**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*

**Physics**

An object moves with constant acceleration 4.20 m/s2 and over a time interval reaches a final velocity of 10.4 m/s. (a) If its original velocity is 5.20 m/s, what is its displacement during the time interval?
*Tuesday, June 28, 2016 by Tulsi*

**Physics**

A cube of side L is place in a uniform electric field E = 3200 N/C. What is the net flux through the cube. Assume the electric field lines are parallel with the edges of the cube. Make sure you know why this is the answer. I know its not perpendicular or at an angle So if it...
*Tuesday, June 28, 2016 by Laura*

**Physics**

How much kinetic energy does the electron gain?
*Tuesday, June 28, 2016 by Anonymous*

**Physics**

What is the final temperature when 8.0 x 105 J are added to 1.50 kg of ice at 0.0 °C?
*Monday, June 27, 2016 by Winsome*

**Physics**

A flat-topped toy cart moves on frictionless wheels, pulled by a rope under tension T. The mass of the cart is m1. A load of mass m2 rests on top of the cart with the coefficient of static friction μs between the cart and the load. The cart is pulled up a ramp that is ...
*Monday, June 27, 2016 by Weasley*

**Physics**

A 4.0-kg block slides down an inclined plane that makes an angle of 25° with the horizontal. Starting from rest, the block slides a distance of 2.5 m in 5.4 s. Find the coefficient of kinetic friction between the block and plane.
*Monday, June 27, 2016 by Maddie*

**physics**

a particle starts moving from rest with uniform acceleration . it travels a distance y in the next 2 sec
*Monday, June 27, 2016 by kpavaniswetha*

**physics**

Two mirrors are inclined at each other such that a ray of light incident on the 1st mirror and parallel to the 2nd mirror is reflected from the 2nd parallel to the 1st mirror.Determine the angle between the mirrors and the deviation suffered by the incident ray.
*Monday, June 27, 2016 by maina*

**physics**

In a city grid, each block on the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance between the start and ...
*Monday, June 27, 2016 by Shelby*

**physics**

a car travelling at 60km/h uniformly retards for 10s and reaches a velocity of 45km/h. find the retardation.
*Monday, June 27, 2016 by Anonymous*

**physics**

an object undergoes an acceleration of 10m/s2 starting from rest. find the distance travelled by it in seconds
*Monday, June 27, 2016 by Anonymous*

**physics**

what is the scientific n otation of 75mm to inches?
*Monday, June 27, 2016 by allal*

**physics**

A piccolo and a flute can be approximated as cylindrical tubes with both ends open. The lowest fundamental frequency produced by one kind of piccolo is 508.7 Hz, and that produced by one kind of flute is 220.3 Hz. What is the ratio of the piccolo's length to the flute'...
*Sunday, June 26, 2016 by nop*

**Physics**

A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 47.0 m/s ; when it leaves the bat, the ball is traveling to the left at an angle of 31.0 ∘ above horizontal with a speed of 58.0 m/s . The ball and bat are in ...
*Sunday, June 26, 2016 by Jordan*

**Physics**

A uniform ladder of mass (m = 14.5 kg) and length (L) leans against a frictionless wall, see figure. Find the static friction force between the ladder and the floor if the angle θ = 64.0°?
*Sunday, June 26, 2016 by Ryan Keefe*

**Physics: Oscillations and spring constant**

A student measured 15s for the 20 complete oscillations for an object of 200g attached at the free end of a spring. Calculate the period of oscillation (T) and the spring constant (k). My work (just wanted to ask for opinions if this is right): T = 2π√(m/k) T = 20 ...
*Sunday, June 26, 2016 by Jenna*

**Physics**

I've figured out the first part that the v is 1.25 m/s, but even with that knowledge can't determine how to calculate the horizontal distance. Can someone help with a formula? You let a ball roll from rest from the top of a ramp sitting on a table. If the top of the ...
*Sunday, June 26, 2016 by Anna*

**Physics **

At what displacement the instantaneous velocity become equal to half of its maximum velocity? Plz help me
*Sunday, June 26, 2016 by Ali*

**physics**

a particle executing shm time period t from mean position the time to complete 5/8 oscillation
*Sunday, June 26, 2016 by rachel*

**Physics **

A car moves for half of its time at 80km/hr and for rest half of time at 40km/hr.The total distance covered is 60km.What is the average speed of the car?
*Saturday, June 25, 2016 by Aadithya*

**Physics **

A bullet moving at 20m/sec strikes a wooden plank and penetrates 4cm before coming to stop.The time taken to stop is?
*Saturday, June 25, 2016 by Aadithya*

**Physics**

A spring that has a force constant of 1200 N/m is mounted vertically on the ground. A block of mass 1.60 kg is dropped from rest from height of 1.50 m above the free end of the spring. By what distance does the spring compress?
*Saturday, June 25, 2016 by Jeff Kinka*

**Physics**

A uniform ladder of mass (m = 14.5 kg) and length (L) leans against a frictionless wall, see figure. Find the static friction force between the ladder and the floor if the angle θ = 64.0°?
*Saturday, June 25, 2016 by Jeff Kinka*

**Physics**

Completely lost on what formula to use: A 50 gram ball enters a pendulum with mass 200 g. The pair then swings up to a height of 12 cm. Find the velocity at which the pair move immediately after the collision. Find the initial velocity of the ball before the collision. ...
*Saturday, June 25, 2016 by Leslie*

**physics**

A block and tackle system of 5 pulleys is used to raise a load of 50kg through a height of 20m the work done against friction is 200J.Calculate the work done by effort,the efficiency of the system and the effort applied.
*Saturday, June 25, 2016 by Mohamedy*

**physics**

find the relative velocity of boat w.r.t water .The velocity of boat is 3i^+4j^ and that of the water is -3i^-4i^
*Saturday, June 25, 2016 by gaurav*

**physics**

A boy moves 400m towards north 300m towards west and again 400m towards south calculate displacement of the boy from initial position
*Saturday, June 25, 2016 by rom*

**Physics **

What is net capacitance if maximum potential is 40 volt and instant charge is 60 coulomb.?
*Saturday, June 25, 2016 by Anonymous*

**Physics**

A 7.25 μC and a -2.00 μC charge are placed 20 cm apart. Where can a third charge be placed so that it experiences no net force. Express your answer in cm. The answer is 22.12 from the online answer key, but how do you set this up?
*Friday, June 24, 2016 by Kim*

**physics 1**

If the position of an object is given by x = 2.00t^3, where x is measured in meters and t in seconds, find (a) the average velocity and (b) the average acceleration between t = 1.0 s and t = 2.0 s. Then find (c) the instantaneous velocity v and (d) the instantaneous ...
*Friday, June 24, 2016 by lolo*

**physics**

an atom is placed in a uniform magnetic induction B. such that its plane normal to the electron orbit makes an angle of 30 degrees with the magnetic induction the torque acting on the orbiting electron?
*Friday, June 24, 2016 by manu*

**Physics**

Research on the physics of living systems. Give two examples to show how physics helps to understand the concepts of evolution, biological systems of living organisms.�
*Friday, June 24, 2016 by Aadi*

**Physics **

On a day that is 30°c, you drop a rock from the top of a well. You hear the sound of the rock hitting the bottom 0.6s after you drop it. How deep is the well?
*Thursday, June 23, 2016 by Anonymous*

**Physics**

A satellite orbits at a distance from the Earth's center of abut 3.00 earth radii and takes 7.30 hours to go around once. What distance (in meters) does the satellite travel in one day? And, what is the orbital velocity (in m/s)? I'm completely lost. I haven't ...
*Thursday, June 23, 2016 by Leslie*

**Physics**

the diameter of the moon is 3.48x10^3 km. what is its surface area in m2?
*Thursday, June 23, 2016 by hi*

**Physics**

A square 1 m on its side has charges on every corner. Calculate the electric field on the upper right corner of the square. Let the charge on each corner be 40 x10-9C. Do I use K(Q*4)/r^2=F Then F/(Q*4)=E K=8.99*10^9 Nm^2/C^2
*Thursday, June 23, 2016 by Kim*

**physics**

A body moves with uniform acceleration with a distance x for 1st sec. What is relation b/w x & y? A) y=24x B) y=16x C) y=12x D) y=8x
*Thursday, June 23, 2016 by Jahangeer*

**physics**

An object experiences an impulse, moves and attains a momentum of 100 kg·m/sec. If its mass is 50 kg, what would its velocity be?
*Thursday, June 23, 2016 by Eli*

**General Physics**

Clarification: this is calculus-based physics, so the methodology is not restricted to trigonometry only. I have two questions, so hopefully I can divide them up nice and evenly. Also, if you know where I should copy and paste proper vector notation from, please tell me so I ...
*Thursday, June 23, 2016 by Justin*

**Physics **

Two parallel forces of magnitude 4 and 6 newton are acting on a body placed at 4m apart. Resultant force will be
*Wednesday, June 22, 2016 by Rajesh *

**Physics**

When an 8-lb rifle is fired, the 0.02-lb bullet receives an acceleration of 10^5 ft/s^2 while it is the barrel? (a) How much force acts on the bullet? (b) Does any force act on the rifle? If so, how much and in what direction? (c) The bullet is accelerated for 0.007 s. How ...
*Wednesday, June 22, 2016 by Trisha*

**Physics**

What is the longest wavelength of light that can be absorbed by a hydrogen atom that is initially in the second excited state?
*Wednesday, June 22, 2016 by Hannah *

**Physics **

A plane wants to fly east. It is capable of flying at 250 m/s, yet a 50 m/s wind is blowing [SW]. What heading must the plane set and what will be the plane's speed relative to the ground?
*Wednesday, June 22, 2016 by Sophie *

**Physics **

Problem 6.08 A highway curve with radius 1000 ft is to be banked so that a car traveling 52.0 mph will not skid sideways even in the absence of friction. Part A At what angle should the curve be banked? θ = ∘
*Wednesday, June 22, 2016 by Spencer Egolf*

**physics**

A square 1 m on its side has charges on every corner. Calculate the electric field on the upper right corner of the square. Let the charge on each corner be 40 x10-9C. Do I use K(Q*4)/r^2=F Then F/(Q*4)=E K=8.99*10^9 Nm^2/C^2
*Wednesday, June 22, 2016 by Kim*

**Physics**

A bullet is moving with velocity u after emerging from a plank its velocity reduces by u/20 then find the total number of planks required to stop this bullet?
*Wednesday, June 22, 2016 by Shreya*

**physics**

A reflecting telescope is used to observe two distant point sources that are 3.50 m apart with light of wavelength 600 nm. The telescope's mirror has a radius of 5.0 cm . What is the maximum distance in meters at which the two sources may be distinguished?
*Wednesday, June 22, 2016 by kay*

**physics**

Two point charges lie along the y axis. A charge of q1 = -12.0 ÂµC is at y = 6.0 m, and a charge of q2 = -5.0 ÂµC is at y = -3.0 m. Locate the point (other than infinity) at which the total electric field is zero.
*Wednesday, June 22, 2016 by bukky*

**physics**

A car accelerates from rest for ten seconds with a linearly increasing speed of 3 m/s every second. If the diameter of the tires is 2/3 m and they roll without slipping, find their final angular velocity in radians per second.
*Tuesday, June 21, 2016 by Anonymous*

**Physics **

0.255 kg catcher is attached by a 45.0 cm long massless cable to a frictionless axle. The catcher is initially at rest. A 0.144 kg ball with a radius of 0.0875 m rolls without slipping from a height of 1.25 m and is captured by the catcher. For a solid ball, I = (2/5)MR2. (a) ...
*Tuesday, June 21, 2016 by Ashley *

**Physics**

A parallel-plate capacitor is constructed with circular plates of radius 5.6×10−2 m . The plates are separated by 0.27 mm , and the space between the plates is filled with a dielectric with dielectric constant κ. When the charge on the capacitor is 1.9 μC...
*Tuesday, June 21, 2016 by Alli*

**physics**

A car moves for half of its time at 80km/hr and for rest half of timeat 40km/hr. Total distance covered is 60km.What is the average speed of car
*Tuesday, June 21, 2016 by devansh*

**PHYSICS**

a mass of 3kg rests on smooth horizontal table connected by a light string passion over a smooth pulley at the edge of the table to another mass of 2kg hanging vertically. when the system is released from rest with what acceleration do the masses move and what is the tension ...
*Tuesday, June 21, 2016 by CHRISTINE*

**physics**

A body with uniform acceleration covers 76 m in the 5th sec and 116 m in the 10th sec.Find the distance traveled in the 15th sec.what is the distance traveled in next 5 seconds. As the body is travelling with uniform acceleration so the distance traveled by it would in 15th ...
*Tuesday, June 21, 2016 by rati*

**Physics**

A squash ball hits a wall at a height of 4m and a distance of 6m away. If the ball left the racquet with a speed of 15m/s, with what angle did the player hit the ball? I have applied concepts of projectile motion and tried kinematic equations. However I have two unknowns that ...
*Monday, June 20, 2016 by Tim*

**Physics **

A skier slides down a frictionless slope of angle 30, is the mechanical energy conserved?
*Monday, June 20, 2016 by Hannah*

**physics**

A body is moving with uniform acceleration of 10m per second square.lf it start from rest calculate its displacement afrer 5s
*Monday, June 20, 2016 by Anonymous*

**physics**

a boy travels a distance of 10m towards south and then he runs towards east and travels 12m in that direction calculate: i)total distance covered by the boy ii)displacement from his initial position
*Monday, June 20, 2016 by suwani*

**physics 2**

A reservoir dam holds an 8 km2 lake behind it. Just behind the dam, the lake is 14.0m deep. What is the gauge pressure at the base of the dam (in Pascals)? What is the absolute pressure at a point 2.5 m down from the surface? Assume the pressure at the surface is one atmosphere.
*Monday, June 20, 2016 by pat*

**Physics**

A water balloon launcher launches a balloon straight up at a flying kite. If the kite is hovering 75.0 meters off the ground, and the balloon hits it on its upward trajectory with a velocity of 12.2m/s, a) What was the launch velocity of the balloon
*Sunday, June 19, 2016 by Anon *

**physics **

crude oil is contained in an iron cylindrical tank whose height is 6m and diameter of the base is 5m. at 0c, the level of crude oil is 20cm below the brim. at what temp will the oil start to over flow from the tank
*Sunday, June 19, 2016 by evans*

**physics**

What is the difference between transverse and longitudinal waves? A.In a transverse wave the disturbance always occurs perpendicular to the direction in which the wave travels, whereas in a longitudinal wave the disturbance always occurs parallel to the line of travel of the ...
*Sunday, June 19, 2016 by nop*

**PHYSICS EXAM PRACTICE QUESTION**

2. A force of 2300 N [E] acts on a 900 kg car for 8 s. At the same time a friction force of 600 N [W] acts. What will the final speed of the car be? How far will it have travelled? How much work was done by the accelerating force? What is the kinetic energy of the car? How ...
*Sunday, June 19, 2016 by Stef*

**Physics**

If a 12v battery is in a circuit with two resistors. r1 and r2. R2 is 60ohms. A voltmeter measuring on either side of r2 gives a reading of 8v. Calculate the current in the circuit and the resistance of r1. Am I right in thinking the v = i/r 8 = 7.5 / 60 so the current is 7....
*Sunday, June 19, 2016 by Tom*

**physics**

A particle is moving along a straight line and its position is given by the relation x=(t3- 6t2- 15t+40) m FIND a) The time at which velocity is Zero, b) Position and displacement of the particle at that point. c) Acceleration for the particle at that line.
*Sunday, June 19, 2016 by umesh*

**physics**

A particle is moving along a straight line and its position is given by the relation x=( t3-6t2-15t+40)mm. Find:- (a). The time at which velocity is zero. (b). Position & displacement of the particle at that point. (c). Acceleration for the particle at that line.
*Sunday, June 19, 2016 by umesh*

**Physics**

How can you explain work, in regards to electricity? I understand it as the product of energy used, usually displacement. I cant understand or explain it as far as electricity is concerned. I'm not sure if I understand it at all.
*Sunday, June 19, 2016 by Steve*

**physics**

1.A ball is dropped from the height of 20m.calculate (i) the time taken by the ball to reach the ground. (ii) the velocity with which the ball strikes the ground.
*Sunday, June 19, 2016 by rahul thakur*

**Physics**

A stone is projected horizontally from the top a tower with a speed of 5m/s.It lands on the ground level at a horizontal distance of 20m from the foot of the tower.Calculate the height of the tower.(g=10m/s2)
*Sunday, June 19, 2016 by Lawson*

**physics**

the length of an aluminium bar of length 80cm increases by 1mm on heating.what is the final temperature of the bar if it was initially at temperature 20 degree celsius?(given:coefficient of linear expansion of aluminium=25×10^-6
*Sunday, June 19, 2016 by Anonymous*

**Physics**

a ball of mass 100g is dropped from the top of a vertical cliff 45m high. Given that the velocity just before striking the sandy beach is 30m/s and the ball penetrates the sand to a depth of 10cm. Determine its average retardation force
*Saturday, June 18, 2016 by Mercie*

**Physics**

A stone is thrown straight up with a velocity of 24.0m/s from a height of 2.00m. How fast is it moving when it is at a height of 13.0m? How much time is required to reach this height?
*Saturday, June 18, 2016 by Maura*

**Physics**

Density
*Saturday, June 18, 2016 by Tendo*

**Physics**

A soccer ball is kicked with a speed of 9.35 m/s at an angle of 25.0 ∘ above the horizontal. If the ball lands at the same level from which it was kicked, how long was it in the air? Please help!
*Saturday, June 18, 2016 by Please Help Understand*

**Physics**

One ball has 7 times the mass and twice the speed of another. 1. How does the momentum of the more massive ball compare to the momentum of the less massive one? Find the ratio of the momenta. 2. How does the kinetic energy of the more massive ball compare to the kinetic energy...
*Saturday, June 18, 2016 by Mike*

**Physics (Normal force and static coefficient)**

Calculate the normal force for a 2 kg object at rest on an inclined surface, α=42 degrees How much is the static coefficient of friction between the surface and the block ---- My work: N = mg*cos(θ) N = (2kg)(9.8n/m^2)cos(42) = 14.57 N F = µsN µs = F/N &...
*Saturday, June 18, 2016 by Jana*

**Physics**

I understand that I have to use newtons laws of motion but I dont really get how to aplly them to this problem. Please help. An aircraft with a mass of 11000kg moving at constant speed and altitude is powered by propellers and experiences drag from air. The thrust is 225kN and...
*Saturday, June 18, 2016 by Summer*

**Physics**

A particle is projected vertically upward from ground with velocity 10 m/s. Find which time particle reaches highest point?
*Saturday, June 18, 2016 by Pragya*

**physics**

one cubic meter of water hass a mass of 1.0x10^-3. (a) determine the mass of 1.0 m^3. (b) assu!ing biological substance are 98% water, estimate the mass of cell with a 1.0 micrometer dia!eter, a human kidney and a fly. assume a kidney is roughly a sphere with radius of 4.0 cm...
*Saturday, June 18, 2016 by Michael*

**Science physics **

The least count of a screw gauge is 0.001cm the diameter of a wire measured by it is 0.225cm. Find out the percentage error in this measurement
*Saturday, June 18, 2016 by Kanika*

**Physics**

A period pulse travel a distance at 20m in 1•00sec,if it's frequency is 2•0×10.calculate the wave length
*Saturday, June 18, 2016 by Anonymous*

**physics**

calculate the net force required to give a 3000kg trucks an acceleration of 2.5m/s^2
*Saturday, June 18, 2016 by james*

**Physics **

What is the electric potential between two points 5.0 centimeters apart if the electric field between those points is a constant 250 Newtons/meter?
*Friday, June 17, 2016 by Dee*

**Physics **

What minimum magnetic field is necessary to exert a 15 Newton force on a 175 milliCoulomb charge moving at 250 meters/secon through the field?
*Friday, June 17, 2016 by Dee*

**physics**

plz solved kre
*Friday, June 17, 2016 by Anonymous*

**Science : Physics**

Will an object accelerate if the forces are balanced? Why or why not? I know that the answer is that it will not accelerate but I'm having a difficult time explaining why.
*Friday, June 17, 2016 by Morgan*

**Science : Physics**

A 15kg object takes 26.3 meters to stop because of friction. Assume no skidding. If the frictional force is 60 N, what is the initial velocity of the object?
*Friday, June 17, 2016 by Morgan*

**Physics**

A 22 kg suitcase is being pulled with constant speed by a handle that is at an angle of 23 ∘ above the horizontal. If the normal force exerted on the suitcase is 150 N , what is the force F applied to the handle? I don't understand how the equations are suppose to be...
*Thursday, June 16, 2016 by J*

**physics**

Find the total heat capacity of a 2.0 mol diamtomic ideal gas at constant pressure if the molecules can rotate and vibrate.
*Thursday, June 16, 2016 by Anonymous*

**Physics**

One method of estimating the temperature at the center of the sun is based on the Ideal Gas Law. Assume the center consists of gases whose average M = 0.70 kg/kmol, density= 91000 kg/m3 and pressure = 1.39 x1011 atm. Calculate the temperature (in kelvins) at the center of the ...
*Thursday, June 16, 2016 by Anonymous*

**physics**

A one mole sample of an ideal monatomic gas at 400 K undergoes an isovolumetric process acquring 550 J of energy by heat. Next it undergoes an isobaric process during which is loses the same amount of energy by heat. Find the work done on the gas. Assume three degrees of freedom.
*Thursday, June 16, 2016 by Anonymous*

**physics**

As an environmentally friendly idea, some have proposed using the temperature gradient of the ocean to generate electricity. This system would use the temperature gradient between the surface of the ocean (at about 200 C) and the water temperature at a depth of about 1 km (at ...
*Thursday, June 16, 2016 by Anonymous*

**Physics**

A multicylinder gasoline engine in an airplane, operating at 2500 rev/min, takes in 7800 J of energy and exhausts 4600 J for each revolution of its crankshaft. What is the mechanical power output of the engine in kilowatts.
*Thursday, June 16, 2016 by Anonymous*

**Physics**

On a beautiful baseball day with air temperature of 200 C, a pitcher throws a 0.142 kg baseball at 49 m/s towards home plate. As it travels 19.4 m, the ball slows down to a speed of 36 m/s because of air resistance. Calculate the change in the temperature of the air through ...
*Thursday, June 16, 2016 by Anonymous*

**Physics**

On a beautiful baseball day with air temperature of 200 C, a pitcher throws a 0.142 kg baseball at 51 m/s towards home plate. As it travels 19.4 m, the ball slows down to a speed of 36 m/s because of air resistance. Calculate the change in the temperature of the air through ...
*Thursday, June 16, 2016 by Anonymous*