Monday

January 23, 2017
**Physics**

A skydiver is falling to earth.Â When he is traveling at 51.3 m/sec, he opens his parachute, and after 3.00 seconds he reaches the speed of 4.30 m/sec.Â The remaining 60 seconds before landing is spent traveling downward at the speed of 4.30 m/sec.&...

*Sunday, September 18, 2016 by Tara*

**physics**

Calculate the resultant force when four forces of 30N due east 20N due north 50N due West and 40N due south are acted upon a body

*Sunday, September 18, 2016 by Suraj*

**physics**

23. Two identical balls each have an excess charge of 5.0 x 10-7 C, and they are attached to the ceiling by light string 0.80 m long as shown in the figure below. If the angle that the threads make with respect to each other is 300, determine the force experienced by each ball...

*Sunday, September 18, 2016 by christian*

**physics**

A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power. If the cost of electricity is 12 cents per kWh, how much does it cost to heat the dinner?

*Sunday, September 18, 2016 by kim*

**physics**

A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power. How much electrical energy (in kWh) is used?

*Sunday, September 18, 2016 by kim*

**physics**

How much heat is necessary to change 345 g of ice at -11Â°C to water at 20Â°C

*Sunday, September 18, 2016 by kim*

**physics**

While in Europe, a tourist hears on the radio that the temperature that day will reach a high of 22Â°C. What is this temperature on the Fahrenheit scale?

*Sunday, September 18, 2016 by kim*

**physics**

The energy released by a heater which draws a current of 5A at 220V for 1min. E ~ V Ã— IÃ— t( hrs)Ã·1000 220Ã—5Ã—0.0167Ã·60000 Is equal to 0.00030 Kwh

*Sunday, September 18, 2016 by lhamo*

**physics**

How much heat is necessary to change 345 g of ice at -11Â°C to water at 20Â°C?

*Sunday, September 18, 2016 by kim*

**physics**

A 4.6 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.45 m above the counter

*Sunday, September 18, 2016 by kim*

**PHYSICS**

In an archery practice an arrow was realesed from a bow with a velocity of 20m/s it strikes and slopes find at what rate the aarrow was aaccelarated

*Sunday, September 18, 2016 by physics*

**mathematical physics**

Using Green's Theorem evaluate the integral ∮c(xydx + x^2y^2 dy) where C is the triangle with vertices (0 ,0), (1, 0) and (1, 2).

*Sunday, September 18, 2016 by gourav bhardwaj*

**mathematical physics**

Using Stokes' theorem evaluate ∫c F.dl where F = yi^+ xz^3 j^-z y^3 k^ and C is the circle x^2+ y^2 = 4; z = -3.

*Sunday, September 18, 2016 by gourav bhardwaj*

**PHYSICS**

What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?

*Sunday, September 18, 2016 by Anonymous*

**physics**

What is the acceleration of a 10-N freely falling object with no air resistance?

*Sunday, September 18, 2016 by lisa*

**Physics**

An automobile accelerates 1.77 m/s2 over 6.00 s to reach freeway speed at the end of the entrance ramp. If the car's final velocity is 24.44 m/s, what is it's initial speed when it began accelerating. the answer i got was 35.06 m/s (35.1 m/s when doing sig figs). I ...

*Saturday, September 17, 2016 by John*

**Physics**

One positive aspect of the potential use of methane hydrate as a fuel is that A.it exists in a pure form ready for use B.there is more of it than there is coal, oil, and natural gas C.it use will never contribute to global warming D.it is easy to mine

*Saturday, September 17, 2016 by Destiny*

**Physics**

A bean jumps vertically off of a table. It has a speed of 10 m/s when it reaches half of its maximum height. How high does it rise?

*Saturday, September 17, 2016 by Jack*

**Physics**

A bean jumps off a table and when it reaches have its height it has a speed of 10 m/s, how high does it rise?

*Saturday, September 17, 2016 by Jack*

**physics**

A vertical spring stretches 13 cm when a 2.3 kg block is hung from its end. (a) Calculate the spring constant. This block is then displaced an additional 3.2 cm downward and released from rest. Find the (b) period, (c) frequency, (d) amplitude, and (e) maximum speed of the ...

*Saturday, September 17, 2016 by Mariaaaaaaa*

**Physics**

A ball is rolled up a ramp with an initial velocity of +10m/s. It arrives at the bottom of the ramp with the same speed 5 seconds later. What is the ball acceleration for the whole trip? What is the velocity after 2 seconds? After 3 seconds?

*Saturday, September 17, 2016 by Koko*

**Physics (Mechanics)**

A bat makes contact with a ball 0.8 meters above the ground. The ball then travels with a speed of 22 m/s, moving up. How high does it go?

*Saturday, September 17, 2016 by Andrew*

**AP physics**

Can two vectors, of unequal magnitude, add up to give the zero vector? Can three unequal vectors? Under what condition?

*Saturday, September 17, 2016 by Susana*

**physics**

How much work is required to lift a 5.2-kg concrete block to a height of 3.1 m?

*Saturday, September 17, 2016 by kim*

**physics**

What is the kinetic energy of a 15 kg dog that is running at a speed of 8.7 m/s (about 19 mi/h)?

*Saturday, September 17, 2016 by kim*

**physics**

A 4.6 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.45 m above the counter?

*Saturday, September 17, 2016 by kim*

**physics**

While rearranging a dorm room, a student does 307 J of work in moving a desk 1.1 m. What was the magnitude of the applied horizontal force?

*Saturday, September 17, 2016 by kim*

**Physics**

You take 4 measurements of the mass of a ball: 2.96 kg, 3.32 kg, 3.31 kg, 3.17 kg. What is the uncertainty of the average mass to 95% confidence? CL=95% N=4 CC=1.84

*Saturday, September 17, 2016 by Gabriel*

**Physics**

Physics teacher has this question for hw. 38. An electric powered model car starts from rest and moves in a straight-line for 4.0 s. The relationship between time and position is x^2+ 2 t^2 = 32, t in seconds and x in cm. Find the velocity at t= 1 s & t = 3 s. he gave us the ...

*Saturday, September 17, 2016 by Eric*

**physics**

You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.40 m above the trampoline directly below, so it is perfect for viewing the the facility. Occasionally ...

*Saturday, September 17, 2016 by p*

**Physics**

A turtle ambles leisurelyâ€“as turtles tend to doâ€“when it moves from a location with position vector r1,x = 1.49 m and r1,y = -2.83 m in a lettuce garden to another location, with position vector r2,x = 3.17 m and r2,y = -4.49 m, where the ...

*Saturday, September 17, 2016 by Chisom*

**Physics**

Q.A ballon is asending at the rate of 5m/s at height of 98m above the ground, when a packet is dropped from the ballon. After how much time and with what velocity it will reach the ground.

*Saturday, September 17, 2016 by Me*

**Physics**

A person driving her car at 45km/h approaches an intersection just as the traffic light turns yellow. She knew that the yellow light lasts only 2s before turning red,and shi is 28m away from the near side of the intersection. Should she try to stop,or should she speed up to ...

*Saturday, September 17, 2016 by Lee*

**Physics**

An athlete performing a long jump leaves the ground at a 27.1 ∘ angle and lands 7.73 m away. 1). What was the takeoff speed? Express your answer using three significant figures and include the appropriate units. 2).If this speed were increased by just 3.0%, how much ...

*Friday, September 16, 2016 by Ashley*

**Physics**

In the figure a uniform, upward electric field of magnitude 1.90 Ã— 103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 19.0 cm and separation d = 1.60 cm. An ...

*Friday, September 16, 2016 by Confused*

**physics**

3 masses m1, m2, and m3 are kept at vertices of an equilateral triangle a, b,c respectively. find the moment of inertia when triangle is rotated about an altitude passing through m1

*Friday, September 16, 2016 by indrajeet*

**Physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3140-kg space tug and a 5050-kg asteroid. They pull on the asteroid with a force of 589 N. Initially the tug and the asteroid are at rest, 504 m apart. How much time does it ...

*Friday, September 16, 2016 by Dot*

**Physics**

A golfer hits a shot to a green that is elevated 3.00 m above the point where the ball is struck. The ball leaves the club at a speed of 17.8 m/s at an angle of 53.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...

*Friday, September 16, 2016 by Dot*

**Physics**

Negative charge -Q is distributed uniformly around a quarter-circle of radius a that lies in the first quadrant, with the center of the curvature at the origin. Fine the x and y components of the net electric field at the origin.

*Friday, September 16, 2016 by Ayaka*

**Physics**

From top of a tower 160 m high a body is projected upwards with a velocity of 40 m/s making an angle of 30Â° with the horizontal. Find the time it will take to reach the ground

*Friday, September 16, 2016 by Diana*

**physics**

You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.40 m above the trampoline directly below, so it is perfect for viewing the the facility. Occasionally ...

*Thursday, September 15, 2016 by parm*

**physics**

While standing on top of a 256 m tall building, you see Iron Man flying straight down toward the ground at a speed of 32.0 m/s. Just as he passes you, you drop a can of Dr Pepper off the roof. How fast is the can going when it passes Iron Man?

*Thursday, September 15, 2016 by parm*

**Physics**

During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 1.86 km/s at an initial inclination of 52.2◦ to the horizontal. The acceleration of gravity is 9.8 m/s^2. a. How far away did the shell hit? Answer...

*Thursday, September 15, 2016 by Peyton*

**Physics**

A projectile of mass 0.998 kg is shot from a cannon. The end of the cannonâ€™s barrel is at height 7 m, as shown in the figure. The initial velocity of the projectile is 11 m/s.The projectile rises to a maximum height of ∆y above the end of the cannon&...

*Thursday, September 15, 2016 by Peyton*

**Physics**

A daredevil decides to jump a canyon of width 4.22 m. To do so, he drives a motorcycle up an incline sloped at an angle of 12.4◦. The acceleration of gravity is 9.8 m/s. What minimum speed must he have in order to clear the canyon? Answer in units of m/s.

*Thursday, September 15, 2016 by Peyton*

**Physics**

Determine the mass of a pasteboard with area 75.0cm

*Thursday, September 15, 2016 by Liv*

**Physics Electricity and magnetism**

Two 10-cm-diameter charged rings face each other, 15.0 cm apart. Both rings are charged to + 30.0 nC . What is the electric field strength at the center of the left ring?

*Thursday, September 15, 2016 by Anonymous*

**physics**

A remote controlled car. My 11 year old grandson, Danny, got a remote controlled car for his birthday. His older brother, Jay, has a set of physics tools, including a sonic ranger. Jay is a computer jockey and has figured out how to make the sonic ranger program show any ...

*Thursday, September 15, 2016 by Sandra*

**Physics**

On this graph, what is the displacement from 0s to 8s? // A. 0.6 m B. 5.0 m C. 2.0 m D. 10.0 m ... I think it's B, if you subtract the final placement and the initial placement. I have a photo to help. Also, what would the instantaneous velocity be here? The slope of the ...

*Thursday, September 15, 2016 by Sandy East Ward*

**PHYSICS**

Let' s try it the right way this time. A person begins walking at noon one day from point A and travels at a constant velocity along a straight line path to point B a distance D away, arriving at 7 pm that evening. The very next day, the traveler leaves B at exactly noon, ...

*Thursday, September 15, 2016 by HHH*

**physics need help asap**

An aeroplane of mass 3500kg of which the aviation fuel is 6000kg,if the fuel is consumed at 180kg/s.what is the minimum velocity of the exhaust gases to enable the plane take off

*Thursday, September 15, 2016 by RV*

**physics**

dissplacement vector A is 4.5 km North, vector B is 3.0 km 50 degrees N of W. Find their resultant

*Thursday, September 15, 2016 by Svetoka*

**Physics**

A bomb explores in mid air into two equal fragments.what is the angle between their direction of motion? Ans:- 180Â°

*Thursday, September 15, 2016 by Raja*

**Physics**

Having captured a mouse, an owl is flying towards the barn where it lives to enjoy dinner. While approaching the barn at a speed of 6.9 m/s at an upwards angle of 8o above the horizontal, the struggling mouse escapes from the talons of the owl while at an altitude of 4.6 m. ...

*Wednesday, September 14, 2016 by jade*

**physics**

Fleas can jump quite high; experiments show that they reach an altitude of 130 times their own height when they jump vertically! Suppose instead that a flea can jump so that it lands a maximum distance of 19.60 cm away. What is the take-off speed for this flea?

*Wednesday, September 14, 2016 by jade*

**physics**

Two workers are moving a slab of ice (m = 290 kg) across the factory floor. As seen from above, one worker exerts a force of 415 N at an angle of -20o, and the other exerts a force of 470 N at an angle of 50o. What is the magnitude of the acceleration of the ice slab?

*Wednesday, September 14, 2016 by Tessa*

**physics**

A major-league pitcher can throw a baseball in excess of 41.3m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 15.2m away from the point of release?

*Wednesday, September 14, 2016 by Tessa*

**physics- magnetism**

A step-up transformer used in a car has a potential difference of 10 V across the primary coil with 12 turns. What is the current in the secondary coil of resistance 2.5 Ω if the number of turns in the secondary coil is 54 turns?

*Wednesday, September 14, 2016 by marjean*

**physics- magnetism**

A 0.35 m2 coil with 50 turns rotates at 5 radians per sec2 in a magnetic field of 0.6 Tesla. What is the value of the rms current in the coil if the coil has the resistance of 3.3 Ω?

*Wednesday, September 14, 2016 by marjean*

**physics- magnetism**

A circular plate of radius 0.5 m is placed perpendicular to the direction of the magnetic field of 0.5 Tesla. What is the change of flux in the plate if it rotates and its plane becomes parallel to the direction of the magnetic field?

*Wednesday, September 14, 2016 by marjean*

**Physics**

The highest wall that a projectile can clear is 17m, when the projectile is launched at an angle of 35.0 degrees above the horizontal. What is the projectile's launch speed?

*Wednesday, September 14, 2016 by Mandy*

**Engineering/Physics**

The space shuttle fleet was designed with two booster stages. If the first stage provides a thrust of 5.25 Mega-newtons and the space shuttle has a mass of 4,530,000 pound-mass, what is the acceleration of the spacecraft in miles per hour squared?

*Wednesday, September 14, 2016 by Tim*

**Physics**

Find, to 3 decimal place, the frequency of the hour hand of a clock

*Wednesday, September 14, 2016 by Lucy*

**Physics**

A hot-air balloon is rising upward with a constant speed of 2.10m/s. When the balloon is 3.18m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?

*Wednesday, September 14, 2016 by Tessa*

**Physics**

A ball is thrown vertically upward from the edge of a bridge 26.5 m high with an initial speed of 11.0 m/s. The ball falls all the way down and strikes the water below. Determine the magnitude of the velocity of the stone just before it strike the water. (In m/s)

*Wednesday, September 14, 2016 by Bex*

**physics**

Determine the direction of frictional forces (left, right, up down) for the objects: 1) A cup resting on top of a car. The car is moving and accelerating to the right. 2) A block being pushed to the right up an incline. 3)A block being placed at the middle of an incline (slope...

*Wednesday, September 14, 2016 by taylor*

**Physics**

The average distance of sun is 1.496 Ãƒâ€”10^11m from the earth.Express the distance in light year and par second.

*Wednesday, September 14, 2016 by Sanyogita*

**Physics**

During takeoff, an airplane climbs with a speed of 180m/s at an angle of 42 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining overhead. How fast is the shadow of the plane moving along ...

*Wednesday, September 14, 2016 by Mel*

**physics**

a liquid cools in 6 minutes from 80degrees Celsius to 60degrees Celsius .what will it's temperature be after 10 minutes.temperature of the surrounding is 30degrees Celsius

*Wednesday, September 14, 2016 by oding*

**Physics**

A particle undergoes two displacements, measured from the positive x-axis, with counterclockwise positive. The first has a magnitude of 11 m and makes an angle of 67 ◦ with the positive x axis. The resultant displacement has a magnitude of 7.7 m directed at an angle of ...

*Wednesday, September 14, 2016 by Gagan*

**physics**

You normally drive on the free way between kidapawan and davao at an average speed of 105km/hr (65mi/hr) and the trip takes 2hr and 20minutes on a friday afternoon,however heavy traffic slows you down and you drive the same distance an average speed of only 70km/hr (50mi/hr. ...

*Wednesday, September 14, 2016 by joan lozano*

**mathematical physics**

Out of 90 applicants for a job, 60 people get selected after the interview. If five applicants are selected at random,calculate the probability that 2 will get selected.

*Wednesday, September 14, 2016 by gourav bhardwaj*

**physics**

a rock is thrown straight up and reaches a height at 10 meters. 1.how long was the rock in the air 2.what is the initial vvelocity of the rock?

*Tuesday, September 13, 2016 by gheng*

**mathematical physics**

For a scaler field ϕ(x, y, z) = x^n+y^n+z^n, show that (🔻ϕ ).r = nϕ , where n is a non-zero real constant.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

A metal sheet has ,on the average , 5 defects per 1.0 m^2. Assuming a poisson distribution , calculate the probability that a 1.5 m^2 piece of the metal sheet will have at least 4 defects.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

An unbiased coin is tossed three times. If A is the event that a head appears on each of the first two tosses , B is the event that a tail occurs on the third toss and C is the event that exactly two tails appears in the three tosses, show that : i) Event A and B are ...

*Tuesday, September 13, 2016 by gourav bhardwaj*

**Science-Physics**

Why is it easier to float in the Dead sea than the Caribbean sea?

*Tuesday, September 13, 2016 by Anonymous*

**Physics**

A car is driving at a speed of 66.0 km/h toward an intersection just as the light changes from green to yellow. The driver has a reaction time of 0.750 s and the magnitude of the braking acceleration of the car is 5.50 m/s2.Find the minimum distance the car travels before ...

*Tuesday, September 13, 2016 by Alison Zook*

**Physics**

I'm having Sig fig troubles. What would 0.98*2040 be using Sig fig rules???

*Tuesday, September 13, 2016 by Stephen*

**Physics**

A drag racer starts her car from rest and accelerates at 4.8 m/s 2 for the entire distance of 409 m. How long did it take the car to travel this distance?

*Tuesday, September 13, 2016 by James*

**physics**

Sally travels by car from one city to another. She drives for 29.0 min at 63.0 km/h, 37.0 min at 32.0 km/h, and 14.0 min at 26.0 km/h, and she spends 14.0 min eating lunch and buying gas.

*Tuesday, September 13, 2016 by will*

**Physics**

An astronaut exerts a 190-N force pushing a beam into place on the International Space Station. The beam accelerates at 0.14 m/s2 .Determine the mass

*Tuesday, September 13, 2016 by Anonymous*

**Physics**

two pith balls each of mass 2 mg are suspended by very light thread of 20 cm long from a common pt. each ball has the same charge so that the threads form angles of 30Â° with the vertical. what is the charge on each ball?

*Tuesday, September 13, 2016 by Anonym*

**Physics**

Two pith balls each of mass 2 mg are suspended by very light thread of 20 cm long from a common pt. each ball has the same charge so that the threads form angles of 30Â° with the vertical. what is the charge on each ball?

*Tuesday, September 13, 2016 by Aayushi*

**Physics**

Two particles A and B,are of equal mass,and moving towards each other,with speeds of 3m/sand 2m/s respectively and collide.Particle B then strikes a plane surface,which is perpendicular to its direction of motion and the rebounce.If the coefficient of restitution between the ...

*Tuesday, September 13, 2016 by Mercypraise*

**Physics**

A body is moving with uniform acceleration describe 40m in first 5second and 65m in next 5second. It's initial velocity will be?

*Tuesday, September 13, 2016 by Akshita*

**mathematical physics**

An unbiased coin is tossed three times. If A is the event that a head appears on each of the first two tosses , B is the event that a tail occurs on the third toss and C is the event that exactly two tails appears in the three tosses, show that : i) Event A and B are ...

*Tuesday, September 13, 2016 by gourav bhardwaj*

**physics**

a ball is thrown verrically upward. the speed of ball was 30m/s when it had reached Â½ of its maximum height. 1) how high did the ball rise 2) find the velocity and acceleration 1 second after it is thrown

*Tuesday, September 13, 2016 by ayush*

**mathematical physics**

A metal sheet has ,on the average , 5 defects per 1.0 m^2. Assuming a poisson distribution , calculate the probability that a 1.5 m^2 piece of the metal sheet will have at least 4 defects.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

Out of 90 applicants for a job, 60 people get selected after the interview. If five applicants are selected at random,calculate the probability that 2 will get selected.

*Tuesday, September 13, 2016 by gourav bhardwaj*

**mathematical physics**

Obtain the derivative and the unit tangent vector for a vector function a(t) = t i^+e^t^2 j^+ sin2t k^

*Tuesday, September 13, 2016 by gourav bhardwaj*

**science,physics**

a 5kg bomb exploded into two fragments .If one fragment with 3 kg moves in a direction with 5m/s then what is the velocity of the second fragment of mass 2kg

*Tuesday, September 13, 2016 by jhon*

**Physics**

If it takes 5 seconds for the baseball to fall, how far from the tower will it land? I used vertical distance formula dy=1/2(g)t^2 and got 122.5 but its one of the answers in the multiple choice. Please help.

*Tuesday, September 13, 2016 by Em*

**Physics**

A fire hose held near the ground shoots water at a speed of 13m/s.At what angle should the nozzle point in order that the water land 16m away?Why are there two different angles? Please show the all the work thank you very much.

*Tuesday, September 13, 2016 by Arman*

**Physics**

A ball thrown horizontally at 21m/s from the roof of a building lands 24m from the base of the building. Now high is the building?

*Tuesday, September 13, 2016 by Arman*

**AP physics**

A store is dropped from the top of a Cliff. It is seen to hit the ground below after 3.55s.How high is the cliff?

*Monday, September 12, 2016 by Susana*

**AP physics**

Two locomotives approach each other on parallel tracks. Each has and average spend of 150 km/h with respect to the ground. If they are initialy 8.5 km apart, how Long will it be before they reach each other?

*Monday, September 12, 2016 by Susana*

**Physics**

Each cubic centimeter of silver has a mass of 10.5 g. (a) What is the mass of 62.9 cm3 of silver? (b) When placed on a beam balance, the 62.9-cm3 piece of silver has a mass of only 612 g. What volume of the piece is hollow?

*Monday, September 12, 2016 by Anonymous*

**Physics**

Each cubic centimeter of silver has a mass of 10.5 g. (a) What is the mass of 62.9 cm3 of silver? (b) When placed on a beam balance, the 62.9-cm3 piece of silver has a mass of only 612 g. What volume of the piece is hollow?

*Monday, September 12, 2016 by Big Homie*

**Physics**

A child throws a rock vertically at 15.0 m/s. It lands on his roof 3.0m above the ground. How long was the rock in the air and what was its speed just before it hit the roof?

*Monday, September 12, 2016 by Vanessa*