Saturday

February 28, 2015

February 28, 2015

Number of results: 79

**Phsyics**

Can you explain to me how an LCD works?
*May 1, 2010 by Emily*

**phsyics**

What is the significance of the sign of the velocity (whether is + or -)?
*September 18, 2009 by Mya*

**Phsyics**

Two objects attract each other gravitationally with a force of 2.1×10−10 when they are 0.21 apart. Their total mass is 4.00 .
*April 3, 2010 by Michael*

**PHSYICS HELP PLZZZZ**

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
*December 3, 2007 by Dan*

**PHSYICS 12 HELP PLEASE!**

Determine the specific gravity of a fish which masses 320g in air and has an apparent mass of 21g in water
*June 3, 2012 by VIJ*

**Phsyics**

Determine the absolute pressure at the bottom of a lake that is 66.1 m deep. Write your answer correct to two decimal paces let Patm = 101,300 Pa
*March 13, 2014 by Paul*

**phsyics**

hi, has anyone done the lab on 1.2 lab : constant velocity? it's about ticker tape. thanks
*March 11, 2009 by ashley*

**Phsyics**

When A 3 kg object is suspeneded by an elastic band, it is stretched 15 cm. What would the srping constant for the elastic be?
*December 8, 2014 by asdasdasda*

**Phsyics**

A 75 kg student stands at the top of a 30 m tall building. How much gravitational potential energy does this student possess?
*May 24, 2012 by Lissa*

**phsyics**

A wheel has a radius of 6.6 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 52.0°?
*November 4, 2012 by Anonymous*

**IPC(integrated phsyics)**

Insulating materials are rated by their _____. specific heat heat index R-value temperature resistance
*November 29, 2010 by lana*

**phsyics **

An airplane has a velocity of 185 miles per hour when it lands, how long must the runway be if the plane decellerates at 2.5 meters per second
*July 5, 2012 by Andrew Moore*

**PHSYICS**

A HIKER SHOUTS TOWARD A VERTICAL CLIFF 685 M AWAY. THE ECHO IS HEARD 4.00 SECONDS LATER. WHAT IS THE SPEED OF SOUND OF THE HIKER'S VOICE IN AIR?
*November 7, 2010 by ROWDY ANDRESS*

**phsyics**

A 975-kg car accelerates. The magnitude of the average net force acting on the car is 3478 N, what is the acceleration of the car?
*December 15, 2011 by cheryl*

**Phsyics**

A model rocket is launched at an angle of 80 degrees aboce the x axis, with a velocity of 30m/s. How high will the rocket be 5 seconds after launch? ROund your answer to the nearest tenth
*September 24, 2013 by Derrick*

**Phsyics**

I want help with this question. I keep getting it wrong. Please help! Estimate the total amount of translational kinetic energy in a small classroom at normal room temperature. Assume the room measures 5.00 m by 12.0 m by 4.00 m.
*May 5, 2011 by Anonymous*

**Phsyics - QUICK QUESTION**

what is the the effect on acceleration of increasing the mass of the cart without increasing the force that is causing the acceleration
*October 26, 2010 by gary*

**phsyics**

A 75.0 g bullet is fired at a muzzle velocity of 476 m/s from a gun with a mass 4.75 kg and a barrel length of 60 cm How long is the bullet in the barrel?
*March 9, 2012 by Anonymous*

**Phsyics**

How much heat is required to raise the temperature of a 4.1-kg block of steel by 64 K? (The specific heat of this steel is 450 J/kg · K.)
*February 18, 2015 by Kim*

**Phsyics**

Hooke's Law and Young's Modulus Can someone please explain this to me. How can one determine if a material behaves according to Hooke's law?
*October 24, 2008 by Mary*

**Phsyics **

A cannonball is fired into the air with a speed of 42 m/s from a height of 28 m, with what speed does the cannonball hit the ground?
*April 16, 2012 by Kelly *

**Phsyics**

Determine the magnitude and direction of the gravitational force exerted a) on the Moon by Earth and b) on Earth by Moon.
*December 18, 2012 by g*

**phsyics**

a 100 kg block being released from rest over a pulley from a height of 1.0 m. It takes 0.98 s to reach the floor. What is the mass of the block hanging on the other side of the pulley.
*September 20, 2012 by mike*

**phsyics**

A compact disk, which has a diameter of 12.0 cm, speeds up uniformly from zero to 2.50 rev/s in 2.10 s. What is the tangential acceleration of a point on the outer rim of the disk at the moment when its angular speed is the following values? (a) 2.00 rev/s
*October 24, 2010 by mary*

**phsyics**

A 8.0×10−2-{\rm kg} toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 m/s in a horizontal circle of radius 0.41 m, Find the angle the string makes with the vertical.
*December 16, 2010 by Lisa*

**Phsyics**

A skier is gliding along at 2.5m/s on horizontal, frictionless snow. He suddenly starts down a 10∘ incline. His speed at the bottom is 13m/s . What is the length of the incline? How long does it take him to reach the bottom?
*January 29, 2015 by John*

**phsyics**

the coefficient of volume expansion for iron is 3.6 X 10^-5/C degrees. If a 17 m long rod of iron is cooled from 100 degrees C to 5 degrees C, What is the new length?
*March 19, 2014 by mel*

**Phsyics**

Is an object with a temperature of 273.2 K hotter than, colder than, or at the same temperature as an object with a temperature of 0'C? I don't know how to convert kelvin to celcius.
*January 17, 2011 by Abida*

**phsyics**

To move a large crate across a rough floor, you push on it with a force F at an angle of 21¨¬ below the horizontal. The mass of the crate is 31 kg, ¥ìs is 0.57, and ¥ìk is 0.45. Find the force necessary to start the crate moving
*September 19, 2012 by nate*

**phsyics**

please I really need help with these 1. A man pulls a 300 N object across a horizontal surface using a 100 N force applied at a 35° angle. What is the normal force? If the object is pulled at constant speed, what is the coefficient of friction?
*October 13, 2010 by physics LSU*

**phsyics**

Bat is flying 5m/s while chasing an insect that is flying in the same direction. The bat emits 40kHz chirp and hears a 40.4kHz reflected sound wave. What is the speed of the insect? ??? lost
*July 19, 2012 by Jake*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*October 26, 2010 by Rachel*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*October 26, 2010 by Rachel*

**Phsyics**

A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
*October 26, 2010 by Rachel*

**phsyics**

Light enters a plate of borosilicate crown glass at an angle of 40.2 degrees with respect to the nor- mal to the air-glass surface. If the index of refraction of the glass is 1.52, find the angle made by the refracted beam with the normal. Answer in units of .
*February 27, 2011 by leslie*

**phsyics**

The electric field intensity between two charged plates is 1.2 103 N/C. The plates are 0.030 m apart. What is the electric potential difference, in volts, between the plates?
*January 12, 2012 by Tammy*

**Phsyics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 kg and a radius of 8.50 km. What is the speed of a satellite orbiting 4.70 km above the surface? What is the escape speed from the asteroid?
*April 13, 2010 by Mikhail Moskvich*

**Basic Phsyics**

A projectile is fired such that the vertical component of its velocity is 49 m/s. The horizontal component of its velocity is 60 m/s. a) how long does the projectile remain in the air? b) what horizontal distance does it travel?
*December 18, 2012 by Caleb*

**phsyics**

An elevator with a weight of 27.9 kN is given an upward acceleration of 1.46 m/s2 by a cable. (a) Calculate the tension in the cable. (b)What is the tension when the elevator is decelerating at the rate of 1.46 m/s2 but is still moving upward?
*September 23, 2010 by harrypotter*

**phsyics**

An elevator with a weight of 27.9 kN is given an upward acceleration of 1.46 m/s2 by a cable. (a) Calculate the tension in the cable. (b)What is the tension when the elevator is decelerating at the rate of 1.46 m/s2 but is still moving upward?
*September 23, 2010 by harrypotter*

**Phsyics**

Can someone give me some pointers on calculating the rest energy of a positron (a particle that has the same mass as an electron and equal but opposite charge) ? thanks The rest energy is equal to the mass times the speed of light squared.
*May 24, 2007 by Jess*

**Phsyics**

A 44.0kg seal at an amusement park slides from rest down a ramp into the pool below. The top of the ramp is 1.75m higher than the surface of the water and the ramp is inclined at an angle of 35.0 degrees above the horizontal. What is the coefficient of kinetic friction between...
*December 17, 2010 by Lisa*

**Phsyics**

In a shipping yard, a crane operator attaches a cable to a 1130-kg shipping container and then uses the crane to lift the container vertically at a constant velocity for a distance of 30 m. Determine the amount of work done by each of the following. (a) the tension in the ...
*March 26, 2014 by ANdy*

**phsyics**

A brick of mass 1.5 kg slides down an icy roof inclined at 30.0° with respect to the horizontal. (a) If the brick starts from rest, how fast is it moving when it reaches the edge of the roof 1.75 m away? Ignore friction. m/s ? (b) Redo part (a) if the coefficient of kinetic ...
*February 27, 2012 by Jacky*

**phsyics**

I was wondering what the difference in current would be in one full extension cord versus several extension cords (which equal the same length as the first) attatched together? I was thinking there would be more resistance when the current goes from one cord to another but I'm...
*May 11, 2009 by Lena*

**phsyics HELP PLEASE**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*November 29, 2011 by darren*

**Phsyics**

How might they use spectroscopy to deter- mine the atmospheric composition of these planets? 1. None of these 2. By analyzing the spectrum of the surface of the planets. 3. All of these 4. By analyzing the molecules that compose the planets. 5. By analyzing the spectrum of the...
*November 13, 2013 by Andrew*

**phsyics**

an 8g bullet is shot into a 4kg block at rest on a frictionless horizontal surface. the bullet remains lodged in the block. the block movies into a spring and compresses it by 3cm. the force constant of the spring is 1500N/m. the initial speed of the bullet is closest to?
*November 6, 2008 by joyce*

**Phsyics**

The center of a 1.10km diameter spherical pocket of oil is 1.10km beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is . Express your answer using two...
*April 15, 2010 by Mikhail*

**phsyics **

An airplane with an airspeed of 60 km/hr lands on a runway where the wind speed is 40 km/hr. (a) What is the landing speed of the plane if the wind is head-on? (b) What is the landing speed if the wind is a tailwind, coming from behind the plane?
*March 19, 2014 by price *

**Phsyics**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*November 28, 2011 by darren*

**phsyics**

A 40.6-kg crate rests on a horizontal floor, and a 69.1-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.
*November 28, 2011 by darren*

**phsyics**

A place kicker must kick a football from a point 35 m (about 38 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 24 m/s at an angle of 48 ◦ to the horizontal. By how much does the ball ...
*September 20, 2012 by asdfghjk*

**phsyics**

A box have a mass of 50 Kilograms is dragged across a horizontal floor by means of a rope tied on the front of it. The coefficient of friction between the box and the floor is .3. If the angle between the rope and the floor is 30 degrees, what force must be exerted on the rope...
*November 25, 2012 by Anonymous*

**Phsyics**

A woman stands on a scale in a moving elevator. Her mass is 63.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9470 N. What does ...
*September 27, 2012 by Anonymous*

**Phsyics**

A woman stands on a scale in a moving elevator. Her mass is 63.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9470 N. What does ...
*September 27, 2012 by Anonymous*

**phsyics**

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of work the (now ...
*November 1, 2011 by Austin*

**phsyics**

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of work the (now ...
*November 1, 2011 by Austin*

**phsyics**

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of work the (now ...
*November 1, 2011 by Austin*

**phsyics**

A jogger accelerates from rest to 3.65 m/s in 3.46 s. A car accelerates from 24.0 to 40.1 m/s also in 3.46 s. (a) Find the magnitude of the acceleration of the jogger. (b) Determine the magnitude of the acceleration of the car. (c) How much further does the car travel than the...
*February 3, 2014 by kyle*

**Phsyics**

An 865 kg (1912 lb) dragster, starting from rest, attains a speed of 26.7 m/s (59.8 mph) in 0.59 s. (a) Find the average acceleration of the dragster during this time interval. m/s2 (b) What is the magnitude of the average net force on the dragster during this time? N (c) ...
*October 3, 2007 by Lee Kite*

**phsyics**

A young girl sits at the edge of a dock by the bay, dipping her feet in the water. At the instant shown in the figure , she holds her lower leg stationary with her quadriceps muscle at an angle of 39 degree with respect to the horizontal. Use the information given in the ...
*December 16, 2010 by Lisa*

**phsyics**

A mass, m1 = 9.36 kg, is in equilibrium while connected to a light spring of constant k = 112 N/m that is fastened to a wall. A second mass, m2 = 6.71 kg, is slowly pushed up against mass m1, compressing the spring by the amount A = 0.201 m The system is then released, and ...
*November 5, 2009 by Anonymous*

**Phsyics**

Two cars start from the same place at the same time. After two hours, one car has traveled 30% farther than the other. If one car's speed is 20mph larger than the other car's speed, what are teh speeds of the cars? Solve algebraically.
*September 19, 2010 by Rosemendz*

**Phsyics**

The electric field is constant in magnitude and direction for the following arrangement of fixed charges: -Close to a point charge -Close to a dipole -Far from a dipole, i.e., at a distance greater than 10 times the charge seperation distance d of the dipole -Around the ...
*February 5, 2010 by Sandra*

**phsyics**

Each of the space shuttle’s main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 617 rev/s. A point on one of the blades traces out a circle with a radius of 0.020 m as the blade rotates. (a) What is the magnitude of the ...
*November 1, 2010 by jack*

**Phsyics**

how fast will a sled go on a 30 degree snow covered hill? how fast will a sled go steep 60 degree angle? how fast would a sled go on a 40 degree angle?
*January 6, 2015 by Carrie*

**phsyics**

A cart of mass M1 = 6 kg is attached to a block of mass M2 = 3 kg by a string that passes over a frictionless pulley. The system is initially at rest and the table is frictionless. After the block has fallen a distance h = 1 m: What is the work Ws done on the cart by the ...
*March 27, 2006 by Jamila*

**phsyics**

An accelerometer in a control system consists of a 4.70 g object sliding on a horizontal rail. A low-mass spring is connected between the object and a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the ...
*October 10, 2012 by Anonymous*

**Phsyics**

A projectile is fired with an initial speed of 61.3m/s at an angle of 44.2∘ above the horizontal on a long flat firing range. (a) Determine the maximum height reached by the projectile. (b) Determine the total time in the air. (c) Determine the total horizontal distance ...
*September 15, 2013 by Tucker*

**phsyics **

A car races on a circular track of radius r. (a) Write an equation for the car's average speed when it travels a complete lap in time t. (b) The radius of the track is 100 m and the time to complete a lap is 14 s. Show that the average speed around the track is 45 m/s.
*March 19, 2014 by price *

**college phsyics**

You push your physics book 1.50 m along a horizontal tabletop with a horizontal force of 2.40N. The opposing force of friction is 0.60N. a) how much work does your 2.40N force do on the book? b) what is the work done on the book by the friction force? c) what is the total work...
*February 12, 2010 by frances*

**phsyics**

A baseball is thrown straight up. The drag force is proportional to v^2. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? In terms of g, what is the y-component of the ball's acceleration when its ...
*September 23, 2010 by jane*

**phsyics **

A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of mass 74.0...
*November 12, 2012 by Anonymous*

**phsyics**

The 3.0cm-diameter water line in the figure splits into two 1.0cm -diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0 m/s and the gauge pressure is 50 kPa. What is the gauge pressure at point B. I keep getting an answer that I ...
*November 15, 2010 by Allison*

**Phsyics Waves**

Earthquakes are essentially sound waves traveling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse seismic waves. These travel at different speeds. The speed of longitudinal waves, called P waves, is ...
*April 25, 2010 by Michael Moskvich*

**Phsyics(Please respond)**

A uniform horizontal beam is attached to a vertical wall by a frictionless hinge and supported from below at an angle è = 38o by a brace that is attached to a pin. The beam has a weight of 347 N. Three additional forces keep the beam in equilibrium. The brace applies a force ...
*June 9, 2012 by Hannah*

**phsyics**

Posted by MELANA on Thursday, October 18, 2007 at 5:14pm. An object in equilibrium has three forces exerted on it. A 30 N force acts at 90° from the x-axis and a 44 N force acts at 60° from the x-axis. What are the magnitude and direction of the third force? NO IDEA WHERE TO ...
*October 18, 2007 by MELANA*

**Phsyics Plz Help**

How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical energy in the ...
*June 11, 2012 by Nasir*

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