Wednesday

September 28, 2016
**physics**

a) Two 36 g ice cubes are dropped into 300 g of water in a thermally insulated container. If the water is initially at 19°C, and the ice comes directly from a freezer at -19°C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if ...

*Friday, April 29, 2016 by ChrismB*

**physics**

A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.

*Friday, April 29, 2016 by Anonymous*

**physics**

A sled is moving at a constant speed down a surface inclined at 45.0° with the horizontal and travels 30 meters in 4 seconds. Calculate the vertical velocity of the sled at the end of 4 seconds.

*Friday, April 29, 2016 by Anonymous*

**Physics**

A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.33 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force vector F of magnitude 1.99 N is ...

*Friday, April 29, 2016 by Trish*

**Physics**

A person is driving on a level road and see's a sign 180m ahead in the middle of the road. The person strikes the sign at a speed of 60km/h. If the person was travelling at 90km/h when the sign was first spotted what was the students perception-reaction time? How far back ...

*Friday, April 29, 2016 by momo*

**physics**

a ray enter from denser medium in to air. if angel incident is30 degree and angel of reflection in air 60 degree.find out refractive index of medium ?

*Friday, April 29, 2016 by hina hina*

**physics**

What mass of steam at 100¡ãC must be mixed with 388 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 45.0¡ãC? The specific heat of water is 4186 J/kg¡¤K. The latent heat of fusion is 333 kJ/kg...

*Friday, April 29, 2016 by jes*

**Physics**

A dam 143 m above a hydroelectric generator holds 1.6 x 1015 L of water. If the generator is taken to be at a height of 0 m, how much potential energy is stored in the dam?

*Friday, April 29, 2016 by Megan*

**Physics**

A dense plastic toy of mass 2.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.

*Thursday, April 28, 2016 by Kitty*

**physics**

Consider a star with a mass of 8.7 x 1031 kg. Determine the radius of the star if a typical star has a density of 1400 kg/m3.

*Thursday, April 28, 2016 by Abby*

**Physics**

NASA wants to build a centrifuge to train its astronauts to handle the strong accelerations they will experience when the space shuttle lifts off. A composite material capable of withstanding a normal force of 120000N without rupturing is used to manufacture the base of the ...

*Thursday, April 28, 2016 by Kid*

**Physics**

An 11.98-gram sample of zinc metal is placed in a hot water bath and warmed to 78.4°C. It is then removed and placed into a Styrofoam cup containing 50.0 mL of room temperature water (T=27.0°C; density = 1.00 g/mL). The water warms to a temperature of 28.1°C. ...

*Thursday, April 28, 2016 by Jen*

**Physics**

A machine gun fires 10 rounds per second. The speed of the bullets is 300m/s. 9.What is the distance in the air between the flying bullets?

*Thursday, April 28, 2016 by Mero*

**Physics help Rolling Motion!!**

A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ...

*Thursday, April 28, 2016 by Samantha*

**physics**

A Boeing 747 “Jumbo Jet” has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the inter- section is 25.0 m. The plane decelerates through the intersection at a rate of 6.1 m/s2 and clears it with a final speed of 45.0 m/...

*Thursday, April 28, 2016 by Arthur*

**Physics**

A boy with a mass of 40kg is seated a distance of 3.0m from the fulcrum of a seesaw. a. Calculate the load force exerted by the boy (Hint: What force is pulling him down?) b. Calculate the torque exerted by the boy. c. If his sister with a mass of 24 kg wants to balance the ...

*Thursday, April 28, 2016 by Rick*

**Physics**

An object attached to a 0.5 m string completes 4 rotations in one second. find the linear velocity(m/s) and the angular velocity(rad/s).

*Thursday, April 28, 2016 by Anonymous*

**Physics**

The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is _______ s.

*Thursday, April 28, 2016 by Hanny*

**Physics**

A 0.50 kg mass is attached to the end of a string swing in a vertical circle(radius=2.0m). When the sting is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?

*Thursday, April 28, 2016 by Anonymous*

**Physics**

I want to know how they found out the value of G

*Thursday, April 28, 2016 by Akhter*

**Physics help**

how much more intense is 75 db compared to 25 db

*Thursday, April 28, 2016 by Anonymous*

**Physics.. Force and pressure **

A tank 4m long, 3m wide and 2m is filled to the brim with paraffin. (density 800kg /m3) calculate the pressure on the base.

*Thursday, April 28, 2016 by Joel seth *

**Physics**

Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other

*Thursday, April 28, 2016 by Anonymous*

**Physics**

Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other

*Thursday, April 28, 2016 by Rushmond *

**physics explanation **

When a baseball gets hit by a baseball bat, what different mechanical models would be used to find where the ball will land, how & when each Mechanical model would be put to use, and how each model describes & explains motions

*Wednesday, April 27, 2016 by Anonymous*

**Physics**

A container of gas is at a pressure of 1.3x10^5 Pa and a volume of 6.0m^3. How much work is done by the gas if it expands at constant pressure to twice its initial volume? Please help ;_;

*Wednesday, April 27, 2016 by IDK*

**Physics**

An archer puts a 0.29 kg arrow to the bow- string. An average force of 224.8 N is exerted to draw the string back 1.44 m. The acceleration of gravity is 9.8 m/s2 . Assuming no frictional loss, with what speed does the arrow leave the bow? Answer in units of m/s.

*Wednesday, April 27, 2016 by Ryan*

**Physics Volume question!!!**

You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did...

*Wednesday, April 27, 2016 by Samantha*

**Physics Rolling Motion!!**

A spherically symmetric object with radius R= 0.51m and mass of M= 3.5kg rolls without slipping accross a horizontal surface with velocity of V = 4.4m/s. It then rolls up an incline with an angle of 30 degrees and comes to rest a distance d = 2.2m up the incline, before ...

*Wednesday, April 27, 2016 by Pam*

**Physics**

a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...

*Wednesday, April 27, 2016 by Emily *

**Physics! Volume!! HELP**

An object hanging on a scale reads 24.0g when submerged in water, but 48.0 g when submerged in oil (specific gravity 0.80) Find the density of the object.

*Wednesday, April 27, 2016 by Mark*

**PHYSICS VOLUME QUESTION!**

You are watering your lawn with a hose when you put your finger over the hose opening to increase the distance the water reaches. If you are pointing the hose at the same angle and the distance the water reaches increases by a factor of 4, what fraction of the hose opening did...

*Wednesday, April 27, 2016 by Steph*

**Physics**

A spring of natural length 1.5m is extended 0.0050m by a force of 0.8N, what will its length be when the applied force is 3.2N?

*Wednesday, April 27, 2016 by Emzkidinn.tk*

**Physics**

What is the maximum mass of a rubber block that can be pulled by a rope whose maximum tension is 3500N? The block is sitting on dry asphalt. (By the way, 1.2 would be used as the coefficient of static friction and 0.8 is the coefficient of kinetic friction for rubber substance...

*Wednesday, April 27, 2016 by Kid*

**Physics**

A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?

*Wednesday, April 27, 2016 by Anonymous*

**Physics**

A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?

*Wednesday, April 27, 2016 by Ben*

**Physics **

Why they need to use gravitational constant in the formula? What would be the problem if the formula is like F=m1*m2/d2 ?

*Wednesday, April 27, 2016 by Akhter*

**physics**

A leaky bucket is being lifted 20 meters. It originally holds 10 kilograms of water, and at the end of its journey it holds 5 kilos. How much work does it take to lift the bucket?

*Wednesday, April 27, 2016 by ChrismB*

**physics**

The half-life of the plutonium isotope is 24,360 years. If 10 grams of plotonium is released into the atmosphere by a nuclear accident, how many years will it take for 80% of the isotope to decay?

*Wednesday, April 27, 2016 by ChrismB*

**physics**

A force of 2-Newtons will stretch a rubber band 2/100 meters. Assuming that Hooke’s Law applies, how far with a force of 4-Newtons stretch the rubber band? How much work does it take to stretch the rubber band this far?

*Wednesday, April 27, 2016 by ChrismB*

**Physics**

A bullet of mass 200 grams is forced with work speed of 400 m/s of it is stopped in 100 m, Find: a.) KE b.) Force needed to stop it

*Wednesday, April 27, 2016 by Chantal*

**physics **

A 10kg block slides towards the 3kg moving block to create a totally inelastic head on collision. The 3kg block comes to a stop after the collision. 1. What speed must the 10kg block be moving at prior to the collision for this to occur? 2. Instead of sliding along a ...

*Wednesday, April 27, 2016 by anna*

**physics**

home / study / science / physics / questions and answers / a 10kg block slides towards the 3kg moving block ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. Question A 10kg block slides towards the 3kg moving block to create a ...

*Wednesday, April 27, 2016 by anna*

**physics**

home / study / science / physics / questions and answers / a block of mass 3kg s sliding along the frictionless ... Question A block of mass 3kg s sliding along the frictionless horizontal surface with a speed of 2m/s. 1. What is the kinetic energy of the block? 2. A wedge is ...

*Wednesday, April 27, 2016 by anna*

**PHYSICS-**

Given a plastic rod and fur,explain how you would charge the electroscope positively and negatively.

*Wednesday, April 27, 2016 by DICKSON.C*

**physics **

Agirl holding aball of diameter 30cm stands 4m in front of a large flat miror . Where and how large is the of the ball?

*Wednesday, April 27, 2016 by muxibo *

**physics**

a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...

*Wednesday, April 27, 2016 by thomas*

**Physics**

A ball of mass m=4.6, at one end of a string of length L=6.6, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. Assuming mechanical energy is conserved, the speed of the ball at the bottom of the circle is:

*Wednesday, April 27, 2016 by Motaseam*

**physics**

a stone of mass 50g is released from rest, Calculate it's kinetic energy after 6s from the beginning of the motion

*Wednesday, April 27, 2016 by Badran*

**physics**

an archer standing on a cliff 48m above the level field below shoots an arrow at an angle of 30• above horizontal with a speed of 80m/s.how far from the base of the cliff will the arrow land.

*Wednesday, April 27, 2016 by lesar*

**physics**

A car A is 300m behind a car B and both are travelling in the same direction at 25m/s. Both cars begin at the same moment to accelerate at steady rate, but A has a greater acceleration and passes B in 20sec by which time B is doing 27•5m/s. Neglecting the length of the ...

*Wednesday, April 27, 2016 by Francis*

**Physics**

A boy stands between two vertical wall and fires a rifle. Under what condition will he hear a single echo from both walls? Calculate the distance between the walls if the single echo is heard six seconds later

*Wednesday, April 27, 2016 by Judith*

**physics**

a cube slides down a frictionless incline as shown and inelastically strikes a cube at the battom of the incline that's 1/2 (one-half) it's mass. The coeff. of restitution between the two masses is 0.7. If incline is 30 cm high and table is 90cm off floor, at what ...

*Tuesday, April 26, 2016 by Emily*

**PHYSICS HELP! **

1. A 125-gram projectile strikes a 1.45 kg block that's attached to a massless vertical pole & becomes embedded in the block causing the bullet & block to swing upward. The overall length of the pole & the block combined is 1.1m. The bullet & block at the highest point ...

*Tuesday, April 26, 2016 by A*

**PHYSICS ROLLING MOTION!!!**

A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?

*Tuesday, April 26, 2016 by Steph*

**AP Physics**

A car with a mass of 1200 kg kg starts from rest and accelerates to a speed of 12 m/s in 12.2 s. Assume that the force of resistance remains constant at 328 N during this time. What is the average power developed by the car’s engine? Answer in units of W.

*Tuesday, April 26, 2016 by Anonymous*

**PHYSICS HELP DENSITY**

An object hanging on a scale reads 24.0g when submerged in water, but 48.0g when submerged in oil (specific gravity 0.80) Find the density of the object.

*Tuesday, April 26, 2016 by Steph*

**physics**

A thin rod has a length of 0.25 m and rotates in a circle on a frictionless tabletop. The axis is perpendicular to the length of the rod at one of its ends. The rod has an angular velocity of 0.33 rad/s and a moment of inertia of 1.40 10-3 kg · m2. A bug standing on the...

*Tuesday, April 26, 2016 by mnjk*

**Physics**

Many hot-water heating systems have a reservoir tank connected directly to the pipeline, so as to allow for expansion when the water becomes hot. The heating system of a house has 57.4 m of copper pipe whose inside radius is 7.52 x 10- 3 m. When the water and pipe are heated ...

*Tuesday, April 26, 2016 by Noodle man*

**Physics**

Please help me solve this, most likely simple, problem. I am just starting to learn physics and am finding it very confusing. If you could include a key to explain any formulas used it would be very helpful thank you. I have calculated GPE to be 1500J but I am totally stuck, I...

*Tuesday, April 26, 2016 by Rich*

**physics**

A splash is heard 3.12s after a stone is dropped into a well 45m deep.the speed of sound in air is(g=10m/s2)

*Tuesday, April 26, 2016 by payal*

**Physics**

A block of weight 3.8 N is launched up a 30 ∘ inclined plane of length 2.20 m by a spring with spring constant 2.40 kN/m and maximum compression 0.10 m . The coefficient of kinetic friction is 0.50. f so, how much kinetic energy does it have there; if not, how close to ...

*Tuesday, April 26, 2016 by Megan*

**Physics**

A car moving at 37 km/h negotiates a 140 m -radius banked turn designed for 60 km/h . What coefficient of friction is needed to keep the car on the road?

*Monday, April 25, 2016 by Megan*

**Physics**

How much heat is required to change a 35.8 g ice cube from ice at -12.7°C to water at 45°C? (if necessary, use cice=2090 J/kg°C and csteam= 2010 J/kg°C)How much heat is required to change a 35.8 g ice cube from ice at -12.7°C to steam at 113°C?

*Monday, April 25, 2016 by Sam*

**Physics**

You step into an elevator, and it accelerates to a downward speed of 8.2 m/s in 2.2 s . How does your apparent weight during this acceleration time compare with your actual weight?

*Monday, April 25, 2016 by Megan*

**Physics**

The latent heat of vaporization of H2O at body temperature (37.0°C) is 2.41E+6 J/kg. To cool the body of a 76.7 kg jogger [average specific heat capacity = 3540 J/(kg*°C)] by 1.90°C, how many kilograms of water in the form of sweat have to be evaporated?

*Monday, April 25, 2016 by Sam*

**Physics**

A 0.300 kg iron horseshoe that is initially at 550°C is dropped into a bucket containing 19.4 kg of water at 21.1°C. What is the final equilibrium temperature (in °C)? Neglect any heat transfer to or from the surroundings. Do not enter units.

*Monday, April 25, 2016 by Anonymous*

**physics**

Four point masses, each of mass 2.0 $kg$ are placed at the corners of a square of side 1.4 $m$. Find the moment of inertia of this system about an axis that is perpendicular to the plane of the square and passes through one of the masses. The system is set rotating about the ...

*Monday, April 25, 2016 by Ron*

**physics**

A cyclist starts from rest and pedals such that the wheels of his bike have a constant angular acceleration. After 18.0 s, the wheels have made 190 rev. What is the angular acceleration of the wheels? What is the angular velocity of the wheels after 18.0 s? If the radius of ...

*Monday, April 25, 2016 by Ron*

**Physics**

As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57 m's (128 mph) in just 3.5 s.

*Monday, April 25, 2016 by Gerald*

**Physics**

A 0.300 kg iron horseshoe that is initially at 550°C is dropped into a bucket containing 19.4 kg of water at 21.1°C. What is the final equilibrium temperature (in °C)? Neglect any heat transfer to or from the surroundings. Do not enter units. I'm taking (...

*Monday, April 25, 2016 by Sam*

**Physics! Rolling Masses! HELP**

The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom. (a) Icm=935 g*cm2, M = 44g (b) ...

*Monday, April 25, 2016 by Steph*

**PHYSICS HELP! ROLLING MOTION**

The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom. (a) Icm=935 g*cm2, M = 44g (b) ...

*Monday, April 25, 2016 by Mark*

**Physics**

Explain, with a diagram,how 2 plane mirror could be fixed at a dangerous T-junction so that a motorists approaching the junction could see all other traffic.

*Monday, April 25, 2016 by Arham*

**Physics**

Two charges +1C and -1C are placed at distance 1m apart ,each having masses 2kg respectively are released.what is the type of collision they experience?

*Monday, April 25, 2016 by Anonymous*

**PHYSICS! HELIUM BALLON**

Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 277.0 kg. What must be the minimum diameter of the spherical balloon?

*Monday, April 25, 2016 by Mark*

**PHYSICS SPECIFIC GRAVITY**

A 6.8 kg block of some unknown material is suspended from a spring scale and submerged in water. The spring scale reads 48.0 N. What is the specific gravity of the block?

*Monday, April 25, 2016 by Chris*

**Physics**

Tarzan, whose mass is 76 kg, travelling at 9.5m/s, grabs from the bottom of a 1.5 m long vine and swings upward. a) Calculate the maximum height of Tarzan. b) Calculate the angle at which the vine makes with the vertical at his maximum height.

*Monday, April 25, 2016 by Someone*

**physics**

A microwave runs off a 110. V circuit and draws 7.00 A of current. How much water would be required to run the microwave for 10.0 minutes if it is powered by a 10.0m high water wheel?

*Monday, April 25, 2016 by john jhon*

**physics!!plz help.**

1. On a scorching summer day a thirsty student finds a 500ml bottle of lemonade in the boot of the car. She measures the temperature of the lemonade to be 32 degrees Celsius. How much ice does she need to add to cool her lemonade down to a refreshing 4.0 degrees Celsius? 2. ...

*Monday, April 25, 2016 by somerandom*

**physics**

A satellite is orbiting around a planet. its velocity is found to depend upon a.)Radius of orbit b.)mass of planet c.)universal gravitational constant(G) Using dimensional analysis find an expression relating orbital velocity to the above physical quantities

*Monday, April 25, 2016 by sahstra kishore*

**Physics**

A car drove 17m/s [N] for 10 seconds, and then speeds up to 25m/s [S] for 7.4 seconds. What is the average speed of the car?

*Sunday, April 24, 2016 by Phil*

**Physics help**

a wave with a frequency of 3.1 hz and a wavelength of 0.3 meters experiences a lengthening of wavelength to 2.6 meters what is the new frequency of this wave? a wave generator produces a wave with a frequency of 45 hz and a wavelength of 1.9 meters. If the settings on the wave...

*Sunday, April 24, 2016 by Anonymous*

**Physics**

A 2.0-microF capacitor is charged to 50V and then connected in parallel (positive to positive plate) with a 4.0-microF capacitor charged to 100V. (a) What are the final charges on the capacitors? (b) What is the difference across each?

*Sunday, April 24, 2016 by gOOD eVE*

**Physics**

Question Three capacitors, each of capacitance 120 pF, are each charged to 500 V and then connected in series. Determine (a) the potential difference between the end plates, (b) the charge on each capacitor, and (c) the energy stored in the system.

*Sunday, April 24, 2016 by gOOD eVE*

**PHYSICS**

What is the potential energy of a 150 kg diver standing on a diving board that is 10 m high?

*Sunday, April 24, 2016 by Victor*

**Physics**

A military gun is mounted on a railroad car (m = 1500 kg). There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 30 kg with a velocity of 300 m/s at an angle of 40° with respect to the ...

*Saturday, April 23, 2016 by Jessica*

**Physics**

two particles of mass m1=1.5 kg, and m2=3.5 kg undergo a 1-dimensional head-on collision. Their velocities along x are V1i=12 m/s, and V2i=-7.5 m/s. The 2 particles stick together after the collision. a.) Find the velocity after the collision. b.) How much kinetic energy is ...

*Saturday, April 23, 2016 by Jessica*

**physics**

i figured out the ratio its 1.10 , dont know how to get the second part please help!! my understanding is not good enough to answer part 2 Pretend you have two containers, one filled with ethyl alcohol and the other filled with benzene. How would you show the distance light ...

*Saturday, April 23, 2016 by please help urgent!*

**Physics**

Blood flows in an aorta of radius 4.62mm at 35.0cm/s. Calculate the volume flow rate. Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from ...

*Friday, April 22, 2016 by Emily*

**Physics**

A 0.294-kg box is placed in contact with a spring of stiffness 3.792×102 N/m. The spring is compressed 1.42×10-1 m from its unstrained length. The spring is then released, the block slides across a frictionless tabletop, and it flies through the air. The tabletop ...

*Friday, April 22, 2016 by Emily*

**Physics**

A skier of mass 110 kg travels down a frictionless ski trial. a.) If the top of the trail is a height 200m above the bottom, what is the work done by gravity on the skier? b.) Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts form ...

*Friday, April 22, 2016 by Jessica*

**physics **

A sphere of radius 0.500 m, temperature 25.7°C, and emissivity 0.915 is isolated in an environment of temperature 77.0°C. At what rate does the sphere emit thermal radiation? At what rate does the sphere absorb thermal radiation? What is the sphere's net rate of ...

*Friday, April 22, 2016 by Caleb*

**physics**

A train blows horn for 5seconds.Find the time for which a person standing at the platform hears the horn if speed of train is 20m/s and speed of sound is 340m/s.

*Friday, April 22, 2016 by deepika*

**Physics**

A 900-kg merry-go-round (a flat, solid cylinder) supports 10 children, each with a mass of 50.0 kg, located at the axis of rotation (thus you may assume the children have no angular momentum at that location). You need to describe a plan to move the children such that the ...

*Friday, April 22, 2016 by Victor*

**Physics**

Two vector of 5N and 6N flow they oriented to get the resultant of 7N,9N?( please solve this question)

*Friday, April 22, 2016 by Bushra*

**PHYSICS**

A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation

*Friday, April 22, 2016 by GLORIA*

**Physics**

Two scales support a massless plank from either end, separated by 3 m. A person, whose height is less than 3 m, lies down on the plank with their head on the leftmost scale. The leftmost scale reads 314 N, and the rightmost scale reads 112 N. (a) Calculate the person’s ...

*Friday, April 22, 2016 by Shirin*

**Physics**

Suppose you’re building a contraption which contains a solid rod of length L = 12.5 m and mass 4.9 kg. This rod has its lower end barely above the ground at an angle of 20.6 degrees with respect to the horizontal, and is ultimately held up by a rope connected at a ...

*Friday, April 22, 2016 by Shirin*

**Physics**

A massless rod of length L = 3.6 m stands up straight, fixed to the ground by a bolt. A horizontal force of 5.5 N is applied at a vertical distance of L/2 to the right. To counter this force and keep the rod stationary, a wire is fixed at the top of the rod and attached to ...

*Friday, April 22, 2016 by Shirin*