# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

Beam supported by a rope that can rotate about a hinge. The beam is supported by a rope attached 1.00 meter from the end of the beam. The beam has a mass of 10.0 kg and is 6.00 meters long. The rope makes a 60degree angle. What is the tension in the rope? What is the magnitude...

*Tuesday, November 17, 2015 by Fred*

**Honors Physics**

At Sirius A's surface, the gravitational force between Sirius A and a 8 kg mass of hot gas has a magnitude of 1480.2 N. Assuming that Sirius A is spherical, with a uniform mass of 4.851e+30 kg, what is Sirius A's mean radius? What is the radius? _______m

*Tuesday, November 17, 2015 by Donkey*

**Honors Physics**

A mechanic jacks up the front of a car to an angle of 8.8° with the horizontal in order to change the front tires. The car is 2.92 m long and has a mass of 1330 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front end. The rear wheels are...

*Tuesday, November 17, 2015 by Donkey*

**physics**

in a car, compressed air exerts a force F1 on a small piston having a radius of 5cm. this pressure is transmitted to a second piston of radius 15cm.if the mass of car to be lifted is 1350kg ,what is the force F1 necessary to accomplish this task?

*Tuesday, November 17, 2015 by sonam*

**physics**

A jumbo jet airplane has a mass of about 400,000 kg when fully loaded with over 400 passengers and takes off at a speed of 250 km/h. Determine;The takeoff speed when the airplane has 100 empty seats. Assume each passenger with luggage is 140 kg and the wing and flap settings ...

*Tuesday, November 17, 2015 by Saleh*

**Mathematics**

A survey of 100 students produced the following statics: 32 study mathematics, 20 study physics, 45 study Biology, 15 study mathematics and biology, 7 study mathematics and physics, 10 study physics and Biology, 30 do not study any of the three subjects 1, Present the ...

*Tuesday, November 17, 2015 by Mesh*

**Physics**

A length l, mass M of the rod can freely rotate about the fulcrum O in the vertical plane. A mass of m, velocity v of bullets at a distance within a fulcrum for the incident at the bar, when the maximum deflection angle of the rod 30 ¡ã,find the initial velocity of the ...

*Tuesday, November 17, 2015 by Jenny*

**Physics**

A satellite is in a circular orbit 810 km above the Earth’s surface; i.e., it moves on a circular path under the influence of nothing but the Earth’s gravity. Find the speed of the satellite. The radius of the Earth is 6.37 × 106 m, and the accel- eration of gravity at ...

*Tuesday, November 17, 2015 by Kiara*

**Physics**

Consider the 608 N weight held by two cables shown below. The left-hand cable had ten- sion T2 and makes an angle of 44◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling. a) What is the tension in the cable labeled T1...

*Tuesday, November 17, 2015 by Leslie*

**physics**

If a standing wave with 10 antinodes occurs at a frequency of 44.1 Hz, at what frequency would you look for the n = 2 standing wave?

*Monday, November 16, 2015 by Kim*

**physics**

You take a set of measurements for the wavelengths and frequencies of standing waves on a string that is under a tension of 2.20 N. You use your data to create a plot of wavelength (in m) vs inverse frequency (in s) and the linear fit of your graph gives a slope of 19.0. What ...

*Monday, November 16, 2015 by Kim*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right- hand cable makes...

*Monday, November 16, 2015 by Adrian*

**Physics**

A cat chases a mouse across a 1.5 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 1.2 m from the edge of the table. What was the cat’s speed when it slid off the table? The acceleration of gravity is 9.81 m/s 2 . Answer in...

*Monday, November 16, 2015 by Azan*

**physics**

A 4 . 7 kg mass weighs 39 . 95 N on the surface of a planet similar to Earth. The radius of this planet is roughly 6 . 2 × 10 6 m. Calculate the mass of of this planet. The value of the universal gravitational constant is 6 . 67259 × 10 − 11 N · m 2 / kg 2 . Answer in...

*Monday, November 16, 2015 by Anonymous*

**Physics**

A mass m = 5.7kg is attached to two springs as it slides along a frictionless floor, while the springs are fastened to two walls. The springs both have k = 420 N/m and are both in their relaxed states (unstretched and uncompressed) when the mass is centered between the two ...

*Monday, November 16, 2015 by Wrenn*

**Physics**

A mass-on-a-spring system has m = 54 kg and k = 225 N/m. The mass is pulled a distance 0.25 m from its equilibrium position and then released. (a) What is the maximum acceleration of the mass? My work: F=ma -kx=ma (225)(.25)=(54kg)(a) solve for a. a=1.04 m/s^2. this is correct...

*Monday, November 16, 2015 by Wrenn*

**Science-physics**

A ball is thrown horizontally from the top of a building 37.5 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion. Answer in units of s.

*Monday, November 16, 2015 by Maggie*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right- hand cable ...

*Monday, November 16, 2015 by Adrian*

**PHYSICS**

The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 5.70 m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?

*Monday, November 16, 2015 by Anonymous*

**Physics**

A ball rolls over the edge of a table with a horizontal velocity v m/s. the height of the table is 2.1m and the horizontal range of the ball from the base of the table is 16m. What is the initial speed of the ball?

*Monday, November 16, 2015 by DaiAna*

**physics**

Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average. If the pedals rotate in a circle of radius 18 cm, the wheels have a radius of 34 cm, and the front and back sprockets on which the chain runs have 42 and 19 teeth respectively (Fig. ...

*Monday, November 16, 2015 by physics*

**PHYSICS**

A dentist's chair with a patient in it weighs 2180 N. The output plunger of a hydraulic system begins to lift the chair, when the dentist's foot applies a force of 73.6 N to the input piston. Neglect any height difference between the plunger and the piston. What is the ratio ...

*Monday, November 16, 2015 by Anonymous*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right- hand cable makes...

*Monday, November 16, 2015 by Adrian*

**Physics 1111 at UGA**

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is one third the escape speed?

*Monday, November 16, 2015 by Merritt*

**Physics**

A chameleon extends its tongue to capture a tasty insect. The tongue accelerates at 33 m/s2 for 0.12 seconds to make the capture. what is the speed of the chameleons tongue when it grabs the insect?

*Monday, November 16, 2015 by anonymous*

**Physics**

Suppose you measure a standing person's blood pressure by placing the cuff on his leg 0.580 m below the heart. Calculate the pressures you would observe if the pressures at the heart are 121 over 80 mm Hg. Assume there is no loss of pressure due to resistance in the ...

*Monday, November 16, 2015 by Kenzie*

**physics**

A cross-country skier who weighs 600 N has chosen ski wax that provides ฯ=0.03. What is the minimum amount of horizontal force,perhaps from a tailwind,that would keep the skier coasting at constant speed across level snow?

*Monday, November 16, 2015 by sarah*

**Physics**

A bicycle with tires 64 cm in diameter travels 5.2 km . Part A How many revolutions do the wheels make? Express your answer using two significant figures.

*Monday, November 16, 2015 by Safia*

**Physics**

The interior of a submarine located at a depth of 50 m in seawater is maintained at sea-level atmospheric pressure. Find the force acting on a window 20 cm square. The density of seawater is 1.03 × 103 kg/m3

*Monday, November 16, 2015 by peter*

**physics**

70-kg man jumps off a raft 2 meter squared moored in a freshwater lake. By how much does the raft rise?

*Monday, November 16, 2015 by yin*

**AP physics 1**

an astronaut on a space walk discovers that this jet pack has no longer works, leaving him stranded 50m from the space-craft. If the jet pack is removable, explain how the astronaut can still use it to return to the ship?

*Sunday, November 15, 2015 by lakpa*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of θ with the wall. The right-hand cable had tension 960 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the right- hand...

*Sunday, November 15, 2015 by Adrian*

**Physics**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of θ with the wall. The right-hand cable had tension 960 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the right- hand...

*Sunday, November 15, 2015 by Adrian*

**Physics HELP**

How would I solve this problem? A plane travels 4300 m at an angle of 49 degrees to the ground, then changes direction and travels 6500 m at an angle of 21 degrees to the ground. What is the magnitude and direction of the planes tot displacement?

*Sunday, November 15, 2015 by Anonymous*

**Physics**

if your plane is flying 25° north of east at the speed of 820 kg per hour how fast is it moving to the north?

*Sunday, November 15, 2015 by Karlie*

**physics**

When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B. Detrmine the force exerted on the shelf by the ...

*Sunday, November 15, 2015 by Anonymous*

**physics**

When a wood shelf of mass 7.2 kg is fastened inside a slot in a vertical support as shown in (Figure 1) , the support exerts a torque on the shelf. Assume that the slot exerts two vertical forces on the shelf, at points A and B.

*Sunday, November 15, 2015 by Anonymous*

**physics**

An airplane is travelling at a speed of 600 mph on a heading of 345 degrees. There is a wind moving at a speed of 70 mph on a heading of 20 degrees. The pilot would like to maintain his planned course. Find the speed and heading he should set in order to travel with the wind ...

*Sunday, November 15, 2015 by johnny*

**Physics HELP**

A bug on a picnic table travels 10 cm east, then 18 cm northward, and finally 20 cm westward. What is the bugs displacement relative to its original position?

*Sunday, November 15, 2015 by Anonymous*

**Physics**

A thin spherical shell of silver has an inner radius of 8.74 x 10-2 m when the temperature is 29.4 °C. The shell is heated to 145 °C. Find the change in the interior volume of the shell.

*Sunday, November 15, 2015 by Kevin*

**physics**

A car travels 15km northwards. 5km eastwards, 10km southwards, and 5km westwards to arrive at point P. Find its total displacement

*Sunday, November 15, 2015 by Benny*

**Physics**

a crane holds a 500kg wrecking ball in place using a wire with tension T1 and is horizontal to the ground. The crane swings it with a cable under tension T2. if the wire holds the ball in place so the cable forms a 20 degree angle with the vertical, determine tensions T1 and T2.

*Sunday, November 15, 2015 by Drew*

**Physics**

A man moves due north 6km then he moves 4km due west and then moves 4km southwards finally he moves 4km eastwards.Find his: total distance and displacement

*Sunday, November 15, 2015 by Nonso*

**Physics 1**

A car manufacturer claims that you can drive its new vehicle across a hill with a 47 degree slope before the vehicle starts to tip. If the vehicle is 2.0 meter wide, how high is its center of gravity?

*Sunday, November 15, 2015 by Chris*

**Physics**

If the magnetic field in a traveling EM wave has a peak value of 17.9nT, what is the peak value of the electric field strength?

*Sunday, November 15, 2015 by Anonymous*

**physics**

Hello I'm having trouble with this physics question: You are examining the loss in intensity as light passes through a fibre optic cable. The input intensity is measured as 55.1 W/m2 and the output intensity as 28.7 W/m2. Calculate the attenuation of the signal in decibels (dB...

*Sunday, November 15, 2015 by diana*

**Physics**

A car starts rolling down a 1-in-6 hill (1-in-6 means that for each 6 m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling 70 m ? Assume an effective coefficient of friction equal to 0.10

*Sunday, November 15, 2015 by Emily*

**Physics**

A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h . It then descends the hill, which is at an average angle of 44 ∘ and is 30.0 m long. Estimate its speed when it reaches the bottom. Assume μk=0.18.

*Sunday, November 15, 2015 by Emily*

**physics help plz :)**

A bicycle spins 10 revs in 5.7 sec. The radius of the wheel is 15 cm a drop of water is 0.3 grams. What height will the drop of water reach when it comes off the wheel?--- I know that I have to use the v=we equation and that grams need to be in kg. But I'm not sure exactly how...

*Sunday, November 15, 2015 by amelia*

**Physics**

Compare the maximum speeds at which a car can safely navigate a flat, unbanked turn of radius 50.0 m in dry conditions versus snowy conditions. The coefficient of static friction in dry weather is 0.90, and in snowy weather it is 0.10. So, find the maximum speed for each ...

*Sunday, November 15, 2015 by Smit*

**Physics**

Determine the velocity of the Hubble deep space telescope while it is in orbit at a height of 598 km (5.98 x 105 m) above the earth’s surface. The earth’s radius is approximately 6.4 x 106 m. The mass of the earth is 6.0 x 1024 kg.

*Sunday, November 15, 2015 by Smit*

**Physics**

A hockey skater turns in a circular path with radius of 31.0 m while going 10.5 m/s. If he experiences a centripetal force of 565 N, what is the mass of the skater?

*Sunday, November 15, 2015 by Smit*

**Physics**

A 1450 kg car goes over a vertical hill with a radius of 64.7 m. What is the maximum velocity that will keep the car on the road as it goes over the hill?

*Sunday, November 15, 2015 by Smit*

**physics**

An ECG monitor must have an RC time constant less than 100 μs to be able to measure variations in voltage over small time intervals. If the resistance of the circuit (due mostly to that of the patient’s chest) is 1000 Ω, what is the maximum capacitance of the ...

*Sunday, November 15, 2015 by carolyn*

**physics**

A disk shaped yoyo (m=220 grams) has a 70 cm long string. The radius of the central winding peg is 2.5 mm, the outer radius of the yoyo is 5.6 cm. A) How much Torque is applied to this yoyo by the string? B) How long until the yoyo hits the bottom of the throw? C) What is the ...

*Sunday, November 15, 2015 by Anonymous*

**Physics**

A train can deccerate at 0.4 m/s. It's traveling at 160km/hr. How far in advance should it apply brakes to come to a full stop.

*Sunday, November 15, 2015 by Jas*

**Physics**

Period of moon=273 days Radius of moon =3,9x10^5 km Radius of satellite = 7200km Period of satellite=?

*Sunday, November 15, 2015 by Mk*

**PHYSICS**

A BALL IS PROJECTED VERTICALLY UPWARD FROM THE TOP OF A TOWER 60MITRE HIGH WITH A VELOCITY OF 30MITRE PER SECONDS.WHAT IS THE MAXIMUM HEIGHT ABOVE THE GROUND LEVEL?HOW LONG DOES IT TAKE TO REACH THE GROUND?

*Sunday, November 15, 2015 by Anonymous*

**Physics**

rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight?

*Sunday, November 15, 2015 by Anonymous*

**Physics**

If the specific heat of ice is 0.5 cal/g degree celsius, how much heat must be released from 5 g of water at 0 degree celsius to change it to ice at -4 degree celsius?

*Saturday, November 14, 2015 by Peter*

**Physics**

A certain amount of gas has a volume of 4000cm^3 at a temperature of 27 degree celsius and a pressure of 1.2 atmospheres. If the pressure is kept constant, find the volume of the gas if it is heated to 60 degree celsius. Please tell me what formula should I use.

*Saturday, November 14, 2015 by Hera*

**Physics**

An automobile is traveling 50 km/h². It deccerate at 5 m/s², how far will it take to travel after the brake are applied?

*Saturday, November 14, 2015 by Abby*

**Physics**

The 3.1 kg box shown below slides with a constant speed down an incline at an angle of θ = 28.0° to the horizontal. What is the coefficient of kinetic friction?

*Saturday, November 14, 2015 by Mariah*

**Physics**

Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hang in static equilibrium, with an ...

*Saturday, November 14, 2015 by Ness*

**Physics**

A piece of aluminum is attached to a string and suspended in a pool of oil with density 780 kg/m3. If the apparent weight of the aluminum is 590 N, what is the volume of the aluminum?

*Saturday, November 14, 2015 by Wrenn*

**Physics**

Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting 1350 N on the vine, what is his acceleration at the point where the vine makes an angle of 45 degrees from the vertical assuming maximum speed at this point. His mass ...

*Saturday, November 14, 2015 by Anonymous*

**Physics**

A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.324 m on a side, is subjected to two shearing forces, each of magnitude F = 6.93 x 10 5 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.

*Saturday, November 14, 2015 by Kevin*

**Math, physics**

A rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel that they weigh one-half their Earth weight?

*Saturday, November 14, 2015 by Pikka*

**Physics**

A car of mass 1380 kg rests on a hydraulic lift with a piston of radius 0.24 m that is connected to a second piston of radius 0.029 m. If the car is just barely lifted off the ground, what is the force at the second piston? my work: 1380kg/.24m = F/.029m (1380)(.029)/.24=F F=...

*Saturday, November 14, 2015 by Wrenn*

**physics**

A boy and girl are balanced on a "massless" seesaw. The boy has a mass of 75 kg and the girl a mass of 50kg. The seesaw is 6 meters in lenght with the pivot point between them...What are the distances each child must sit relative to the pivot point?

*Saturday, November 14, 2015 by Joe*

**physics**

5kg particle is attaced at arim of arotating wheel of radius 2m. the wheel completes each revolution in 3seconds. The total moment of inertia of the sysem(I particle+I wheel) is 2kg.msquare) find A, Determine the rotational kinetic energy of the system? B, the work need to ...

*Saturday, November 14, 2015 by cheru*

**physics**

A uniform solid cylinder of mass 1kg rolls with out slipping on aflate surface at aspeed of pay/200rad/s how long will it be when they meet?

*Saturday, November 14, 2015 by AAB*

**physics**

Two satellites are monitored as they orbit the earth,satellites Y is foure times as far from earth's centre as is satellite X. IF the period of revolution of satellite X is T. WHAT IS THE PERIOD OF REVOLUTION OF OF Y?

*Saturday, November 14, 2015 by barch*

**physics**

what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away?(use g=10m/s square)

*Saturday, November 14, 2015 by taru*

**physics**

The coefficient of friction b/n the tyre of the car rotating around horizontal circular road and the road way is 0.5; whate would the minimum radius at w/c acar turn a horizontal road when its speed is 15m/s?(g=10m/s square)

*Saturday, November 14, 2015 by eden*

**physics**

The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand

*Saturday, November 14, 2015 by Anonymous*

**physics**

The AM frequencies of a radio dial range from 550 kHz, and the FM frequencies range of 88.0 MHz to MHz. all of these radio waves travel at a speed of 3.0x10^8 m/s, what are the wavelenght ranges of a.) the aM brand b.) FM brand

*Saturday, November 14, 2015 by Jane*

**Physics**

A car traveling 60km/hr accelerates at the rate of 2.0m/s2. How much time is required for the car to reach a speed of 90km/hr? can u help me with this? With solutions

*Saturday, November 14, 2015 by Jamila Felarca*

**physics**

A fast-moving superhero in a comic book runs around a circular, 70-m-diameter track five and a half times (ending up directly opposite her starting point) in 3.0 s . What is her angular speed, in rad/s?

*Saturday, November 14, 2015 by Shakira*

**Physics**

A motorist travels 160km at 80km/hr and 160km at 100km/hr. What is the average speed of the motorist for this trip? I need the step by step solution because I didn't listen to ny teacher properly

*Saturday, November 14, 2015 by Michael Lawrence Dureza*

**physics**

A circular disk of 10cm radius is charged uniformly with a total charge of Q. Find the electric field intensity at a point 20cm away from the disk along its axis

*Saturday, November 14, 2015 by Anonymous*

**Physics**

A gardener waters a lawn. the hose ejects 5*10^-4 m^3 of water per second. The area of the mouth of the hose is 5 cm^2. Find the backward force exerted on the gardener.[density of water=10^3kg/m^3]

*Saturday, November 14, 2015 by Alice*

**physics**

what do you think will happen if a blackhole and a whitehole are close to each other

*Friday, November 13, 2015 by stephan*

**Physics**

An airplane is circling an airport by traveling a horizontal circular path at a speed of 400 km/h. The bank angle of the wings is 20 degrees. What is the radius of the circular path the plane is flying? I honestly do not know where to start this. And it is an algebra-based ...

*Friday, November 13, 2015 by Michael*

**Physics**

What is the gravitational force between two identical 4,500 kg asteroids whose centers of mass are separated by 120 m?

*Friday, November 13, 2015 by Dax*

**physics**

"How far would a tennis ball (100g) go if thrown from your catapult at a height of 1m with a force of 50 N and at an angle of 50 degrees from the horizontal?"

*Friday, November 13, 2015 by bisha*

**physics**

a piece of metal of density 7800kgm-3 weighs 20N in air. Cal. The apparent weight of th metal when completely immersed in a liquid of density 830kgm-3

*Friday, November 13, 2015 by David soye*

**Physics/Science**

During a baseball game, a batter hits a pop- up to a fielder 72 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5 s, how high does it rise?

*Thursday, November 12, 2015 by KT*

**Physics**

The moon is a satellite that orbits the earth at a radius of 3.85 × 108 m. The mass of the earth is 5.98 × 1024 kg. What is the orbital speed of the moon?

*Thursday, November 12, 2015 by Hannah*

**Physics 101**

A carousel has a diameter of 10 m. How far (path length) does little Joey, strapped in at the very edge of the carousel, travel if the carousel is rotated through angle of 45 degrees, 45 rad and 45 rev, respectively?

*Thursday, November 12, 2015 by Brittany*

**Physics**

A 175-N box is placed on an inclined plane that makes a 20.0° angle with the horizontal. Find the component of the weight force parallel to the plane's surface.

*Thursday, November 12, 2015 by Wesley*

**physics b**

If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is A Q B 2 Q C 3 Q D 4Q please help me asap

*Thursday, November 12, 2015 by marie*

**physics b**

If heat Q is required to increase the temperature of a metal object from 4°C to 6°C, the amount of heat necessary to increase its temperature from 6°C to 12°C is _____.

*Thursday, November 12, 2015 by marie*

**physics b**

In a waterfall, much of the energy of the falling water is converted into heat. If all the mechanical energy is converted into heat that stays in the water, how much of a rise in temperature occurs in a 100 m waterfall? For water, c = 4.186 × 103 J/(kg • C°)

*Thursday, November 12, 2015 by destiny*

**physics**

what is heat

*Thursday, November 12, 2015 by mara*

**physics b**

You add 8950 J of heat to 174 g of iron. What is the temperature increase of the iron (c = 452 J/(kg • C°))?

*Thursday, November 12, 2015 by destiny*

**physics b**

A nail driven into a board increases in temperature. If 60% of the kinetic energy delivered by a 1.8 kg hammer with a speed of 7.8 m/s is transformed into heat that flows into the nail and does not flow out, what is the increase in temperature of an 8 g aluminum (c = 900 J/(kg...

*Thursday, November 12, 2015 by destiny*

**physics**

what is diffraction? When does it occur? Which waves will defract more when passing through an opening?

*Thursday, November 12, 2015 by mara*

**physics**

A stone is thrown from a height of 1.8 with a velocity of 29.4. How long does it take to reach its greatest height? I'm sure it has something to do with the s=ut+1/2 at squared not sure though

*Thursday, November 12, 2015 by Jack*

**PHYSICS**

A pitcher throws a curveball that reaches the catcher in 0.64 s. The ball curves because it is spinning at an average angular velocity of 350 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...

*Thursday, November 12, 2015 by Anonymous*