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August 2, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
John exerts constant force of 120 N for 10 s. on a stalled motorcycle. The final velocity is 8 m/s after the force was applied. If original velocity was zero, what is a)change of momentum b) the impulse produced c) magnitude of the mass of motorcycle a&b) Impulse=deltaP=(120)(...
Saturday, June 21, 2014 at 6:12pm

physics
Oil Flows through a horizontal cylindrical pipeline with an average speed of 1.2 m/s. The pipeline has a radius of 0.5 metres. Calculate the volume of oil (in cubic metres) which flows through this pipeline in one hour.
Saturday, June 21, 2014 at 4:59pm

physics
Calculate the speed of water (in m/s) flowing from a pipe at the bottom of an open topped barrel which has a water level 138 cm high in it.
Saturday, June 21, 2014 at 4:58pm

physics
A sound registers 77.9 decibels on a detector. What is the intensity in W/m2? Assume the threshold of human hearing is 1.0×10-12 W/m2. Give your answer in picowatts/m2. 1 pW = 1×10-12 W/m2
Saturday, June 21, 2014 at 4:57pm

physics
Calculate the speed of a wave in m/s along a taut string with tension 139 Newtons and a mass per unit length of 3.6 grams per metre.
Saturday, June 21, 2014 at 4:57pm

Physics
A dart gun where you compress the spring and it shoots a rubber dart of a mass 0.122 kg. The dart is shot vertically and gains 2.50 m. a) what speed did the dart leave the toy gun? b) If the spring is compressed 0.125 m what is the elasticity coefficient of the spring?
Saturday, June 21, 2014 at 11:45am

physics
a stone is projected upward with a speed of 80.0ft/s from a 224 ft tower. find the maximum height and the speed at which it strikes the ground.
Saturday, June 21, 2014 at 9:41am

Physics
An airplane is flying due south with a velocity of 26.0 m/s. a. If there is a tailwind of 27.0 m/s, what is the magnitude and direction of the actual velocity of the airplane? (a tailwind blows in the same direction as the motion of the airplane) b. If there is a headwind of ...
Saturday, June 21, 2014 at 5:48am

physics
12 equal wires of same rasistance R are joined to form a cube. Find the total rasistance between corners of same edge of cube
Saturday, June 21, 2014 at 5:05am

Physics
A stone is dropped from a height of 50 m above the ground will it has a uniform or a non-uniform speed as it moves towards the ground.
Saturday, June 21, 2014 at 4:26am

physics
a car accelerates with an acceleration of 2m/s2 for 5secs what is its final velocity at the end of 5secs if its initial velocity is 40m/s?
Saturday, June 21, 2014 at 3:26am

Physics-half way fin.
A person was shot vertically upward from a cannon with a mass 52 kg and a speed of 35 m/s. a) what was the height according to conservation of energy and b) what was the person's total energy? (TME never changes!) a) used TMEo=TMEf height= 63 m. b.)Would I use PE=mgh
Saturday, June 21, 2014 at 12:19am

physics
What is the difference b/w longitudinal wave and transverse wave ?
Saturday, June 21, 2014 at 12:14am

ap physics
A golfer sees the green (where the hole is) at a distance of 120.0 m at heading 75.0° north of west. She also sees her teammate at a distance of 60.0 m and heading 15.0° north of east. What distance and direction would her teammate have to land the ball to hit the ...
Saturday, June 21, 2014 at 12:11am

Physics
A car is moving at 50 miles per hour. The kinetic energy of that car is 5 × 105 J. How much energy does the same car have when it moves at 114 miles per hour? Answer in units of J
Friday, June 20, 2014 at 11:42pm

ap physics
A golfer sees the green (where the hole is) at a distance of 120.0 m at heading 75.0° north of west. She also sees her teammate at a distance of 60.0 m and heading 15.0° north of east. What distance and direction would her teammate have to land the ball to hit the green?
Friday, June 20, 2014 at 11:33pm

general physics
what are the differences between polygon and parallelogram method?
Friday, June 20, 2014 at 10:43pm

physics
A 2.40 kg firecracker explodes into two pieces and produces 170 J of heat, light, and sound energy. One of the pieces has a mass of 0.800 kg and a speed of 4.50 m/s after the explosion. If the mass of the other piece is 1.20 kg, what is its speed after the explosion?
Friday, June 20, 2014 at 10:22pm

Physics
A daredevil decides to jump a canyon of width 6.5 m. To do so, he drives a motorcycle up an incline sloped at an angle of 9.45◦. The acceleration of gravity is 9.8 m/s2 . What minimum speed must he have in or- der to clear the canyon? Answer in units of m/s
Friday, June 20, 2014 at 7:07pm

Physics-check plz
If a pitcher throws a fast ball with a speed of 35 m/s. The ball has a mass of 220 grams. a) how much work was done in throwing the ball? b) If the catcher catches the ball by moving his mitt 15 cm. backward what force did he exert? a.) Throwing the ball in a positive ...
Friday, June 20, 2014 at 4:32pm

physics
a rock is thrown vertically down from a bridge with an initial velocity of 30m/s and strikes the water in 2.0sec. find the velocity with which the rock strikes and the height of the bridge.
Friday, June 20, 2014 at 3:49pm

physics
a stone is thrown straight upward and rises to a maximum vertical height of 40.0m. with what velocity was it thrown and how long does it take for the stone to return to the initial level from which it was thrown?
Friday, June 20, 2014 at 3:47pm

physics
a steel ball dropped from a tower strikes the ground in 3.0 seconds. Find the velocity with which the ball strikes the ground and the height of the tower in meters.
Friday, June 20, 2014 at 3:45pm

physics
if a bird is sitting on a seat in a plane that is travelling 300 km/h[E], if the bird jumps for a couple seconds will he: land on the front of the bus, back of the bus, one seat ahead, one seat behind, on the same seat he was standing on
Friday, June 20, 2014 at 2:39pm

physics
In space, an object has only ONE force acting on it. Can the object have constant acceleration and/or a velocity of 0. Explain.
Friday, June 20, 2014 at 1:14pm

physics
In a vacuum, a stone and feather fall at the same time. Can you make the assumption that the acceleration of gravity acting on both objects is the same? Explain.
Friday, June 20, 2014 at 1:13pm

physics
1)if y=e^x . cot x then dy/dx will be 2) f(x)=sin²x-cos²x then the value of f' (π/4)
Friday, June 20, 2014 at 12:52pm

physics
1)if y=x³+2x²+7x+8 then dy by dx will be- 2) if y= 1/x⁴ then, dy by dx will be: 3) if y = x² sin x, then dy/dx will be-
Friday, June 20, 2014 at 12:45pm

physics
1) y=4+5x + 7x³. Find dy/dx 2) if y= tan x cos²x then dy by dx will be-
Friday, June 20, 2014 at 12:41pm

physics
1)Y=x+x².+1/x+1/x³ find dy by dx 2)y=x²+1/x². Find dy by dx
Friday, June 20, 2014 at 12:38pm

physics
1.∫ x³(x+1)dx 2.∫ (1-cot²x)dx 3.∫ cosx(tan x + sec x) dx 4.∫ dx/√5x+8 using u= 5x+8 and using u= √5x+5
Friday, June 20, 2014 at 12:34pm

PHYSICS
'if diametre of earth is reduced to half mass remains constant what is then duration of day and night'
Friday, June 20, 2014 at 11:03am

physics
at the start of a race , a horse accelerates out of the gate at a rate of 3.00m/s squared. how long does it take the horse to cover the first 25.0m of the race?
Friday, June 20, 2014 at 10:33am

physics
a car travel with a uni form velocity of 25m/s for 5& the brak over then applied and the car coms the rest wirh a uniform retar in fyrther 10s draw ut grph and use it to find 1 distance covered 2 the reatardation
Friday, June 20, 2014 at 12:42am

college physics
An ultrasonic motion sensor sends very short pulses for ultrasound to measure the distance to an object . The sensor cannot send another pulse until the echo form the previous pulse is detected. What is the maximum possible number of individual measurements per second if the ...
Thursday, June 19, 2014 at 8:44pm

physics
Find the work done by 2.32 moles of an ideal gas if its volume doubles at a constant temperature of 22.6°C.
Thursday, June 19, 2014 at 8:13pm

physics
what air speed and heading would enable a plane to travel [NE] with a ground speed of 275 km/h if there is a wind blowing at 55 km/h from the south?
Thursday, June 19, 2014 at 7:40pm

physics
A proton has mass 1.7×10−27 kg. What is the magnitude of the impulse required to increase its speed from 0.995c to 0.998c? magnitude of impulse = i used mv=vectorp i dont know what to do from there
Thursday, June 19, 2014 at 7:11pm

physics
A 100-kg object is lifted to an altitude of 1000 km. What is the weight of the object on the ground? Does it have the same mass and weight at 1000 km? Explain.
Thursday, June 19, 2014 at 6:02pm

physics
1.∫ x³(x+1)dx 2.∫ (1-cot²x)dx 3.∫ cosx(tan x + sec x) dx 4.∫ dx/√5x+8 using u= 5x+8 and using u= √5x+5
Thursday, June 19, 2014 at 1:08pm

Physics
You have a grindstone with a mass of 90.0 kg, 0.340-m radius, and is turning at 90.0 rpm. You press a steel ax against it, bringing it to a stop in 36.0 s. (a) What is the change in kinetic energy of the grindstone? (b) If the tangential force due to the friction between the ...
Thursday, June 19, 2014 at 12:20pm

physics
1.∫ csc (u-π/2) cot (u-π/2) du. 2.∫ sec^2(3x+2)ds 3.∫ √3-2s ds 4. ∫ 12(y^4+y4y^2+1)^2 (4^3+2y) dy use u= y^4+4y^2+1
Thursday, June 19, 2014 at 11:47am

physics
A ball is thrown vertically upwards and returns to its initial position in 6.0 second. What is its initial speed
Thursday, June 19, 2014 at 8:15am

Physics
Consider a car starting at rest at the beginning of a 250 m street. At time t = 2.0 s it is 20 m along the street. At time t = 4.0 s it is 80 m along the street. Find its average velocity in the: (a) First 2.0 s (b) First 4.0 s (c) Last 2.0 s My work: I have done 2 question a ...
Wednesday, June 18, 2014 at 11:05pm

Physics
a boat leaves shore and travels 30km east and then 15km 50 degree South of east Find the resultant the boats resultant displacement?
Wednesday, June 18, 2014 at 10:12pm

Physics
1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed. 2. A boy kicked a can horizontally from a 6.5 m high rock with a speed of 4.0 m/s. How far from ...
Wednesday, June 18, 2014 at 10:06pm

physics
an electric hot water heater takes in cold water at 13.0 degrees celsius and delivers hot water. the hot water has a constant temperature of 45 degrees celsius when the "hot" faucet is left open all the times, and the volume flow rate is 5.0 x 10 ^-6 m^3/s. what is ...
Wednesday, June 18, 2014 at 9:44pm

Physics
1. A rabbit and a turtle are practicing for their big race. The rabbit covers a 30.0 m practice course in 5.00 seconds; the turtle covers the same distance in 120 seconds. If the actual race is run on a 96.0 m course, by how many seconds will the rabbit beat the turtle? 2. Two...
Wednesday, June 18, 2014 at 8:38pm

physics
a body of mass 40kg walk to a step in 40. find the kinetic energy
Wednesday, June 18, 2014 at 7:32pm

Physics
A person of mass 83.8 kg escapes from a burn- ing building by jumping from a window situ- ated 25 m above a catching net. The acceleration of gravity is 9.8 m/s2 . If air resistance exerts a force of 109.1 N on him as he falls, determine his speed just before he hits the net. ...
Wednesday, June 18, 2014 at 4:23pm

physics
A rifle bullet with a mass of 16.5 g traveling toward the right at 285 m/s strikes a large bag of sand and penetrates it to a depth of 22.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.
Wednesday, June 18, 2014 at 1:12pm

Physics
Determine the electric force of a -8.0uc charge would experience when placed 14cm to the left of a 5.0uc charge. got 18N, but I'm not sure if I add the negative to the answer
Wednesday, June 18, 2014 at 12:40pm

physics
If the change in the value of 'g ' at a height 'h ' above the surface of earth is the same as at a depth 'x ' below it. When both x and h are much smaller than the radius of the earth. The relation between x and h is?
Wednesday, June 18, 2014 at 2:04am

physics
1. Two similar cylindrical polished bars weighing 5.00 N each lie next to one another in contact. A third similar bar is placed on the other two in the groove between them. Neglecting friction what horizontal force on each other is necessary to keep them together? 2. Many ...
Wednesday, June 18, 2014 at 1:38am

Physics
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy ...
Wednesday, June 18, 2014 at 12:12am

Physics
The sun is a satellite of Milky Way's galactic central cluster. The sun revolves around this center with a radius of 2.28x10^20 m. and with a period of 2.52x10^8 years. If the universe is 16 billion years old. a) How many times has the galaxy rotated and b)with what speed ...
Wednesday, June 18, 2014 at 12:05am

Physics
Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy ...
Tuesday, June 17, 2014 at 11:05pm

Physics
A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and b) the average speed.
Tuesday, June 17, 2014 at 9:52pm

physics
Any vector can be written as a unit vector multiplied by the magnitude of the vector (a positive scalar). Write each of the following vectors as the magnitude of the vector times the appropriate unit vector: < 0.00330, 0, -0.00330 >
Tuesday, June 17, 2014 at 9:18pm

physics
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 1.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 2.60 ...
Tuesday, June 17, 2014 at 9:02pm

Physics
On the way to class, you walk north and then west such that your resultant displacement is 290 m in a direction 250 west of north. Your average velocity is 2.0 m/s in the same direction as the displacement. Calculate (a) your walking time and (b) your average speed.
Tuesday, June 17, 2014 at 8:37pm

Physics
Carlo drives his car for a picnic by first going 105 km north to pick up his girlfriend and then 120.0 km east to reach the picnic groove. The whole trip takes 135 min. Calculate (a) Carlo’s average speed and (b) average velocity.
Tuesday, June 17, 2014 at 8:37pm

PHYSICS.
5. A motor lifts a 12 kg mass to a height of 15 m at a constant velocity in 3.5 s. a) Find the power b) If the motor is only 35% efficient find the input energy.
Tuesday, June 17, 2014 at 7:22pm

physics
At a certain instant a ball passes location < 11, 10, -16 > m. In the next 3 seconds, the ball's average velocity is < -8, 37, 30 > m/s. At the end of this 3 second time interval, what is the height y of the ball?
Tuesday, June 17, 2014 at 7:00pm

Physics
A block of mass m = 2.4 kg is released from rest at a height of H = 3.0 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 317.0 N/m. What is the maximum compression of the spring, x?
Tuesday, June 17, 2014 at 6:05pm

physics
A person sitting quietly in a room on a winter day may lose heat primarily by radiation from the outer surface of her clothes to the walls of the room. If the walls are at 11.5° C and the rate of radiation is 75.2 kcal/h (a typical basal metabolic rate), what is the ...
Tuesday, June 17, 2014 at 5:17pm

Physics
A skier swoops down a hill and over a ramp. She starts from rest at a height of 18m, leaves the ramp at an angle of 45 degrees, and just clears the snowman on her way down, making an angle of 30 degrees with the vertical as she does. Assuming that there is no friction, and ...
Tuesday, June 17, 2014 at 4:15pm

physics
a child drops a toy at rest from a point 4m above the ground at the same instant her friend throws a ball upward at 6m/s frrom a point 1m above the ground. at what distance above the ground do the ball and the toy cross paths?
Tuesday, June 17, 2014 at 3:51pm

physics
The drawing shows an equilateral triangle, each side of which has a length of 4.53 cm. Point charges are fixed to each corner, as shown. The 4.00 C charge experiences a net force due to the charges qA and qB. This net force points vertically downward and has a magnitude of 779...
Tuesday, June 17, 2014 at 2:12pm

physics
An object of mass 50kg is placed on inclined plane at an angle of 30 degrees to the horizontal. The height of the plane is 250cm and it's length is 500cm. What is the workdone in moving the object down the plane?
Tuesday, June 17, 2014 at 2:03pm

physics
A sailboat race course consists of four legs, defined by the displacement vectors , , , and , as the drawing indicates. The magnitudes of the first three vectors are A = 2.80 km, B = 4.70 km, and C = 4.50 km. The finish line of the course coincides with the starting line. ...
Tuesday, June 17, 2014 at 12:24pm

physics
1.when a person diet's is their goal to lose weight?explain. 2.a man enters an elevator holding 2 boxes one on top of the other the top box has a mass of 6.0kg,the bottom box has a mass of 8.0kg. the man sets the 2 boxes on a metric scale sitting on the floor when the ...
Tuesday, June 17, 2014 at 7:12am

physics
to find angle of deviation with angle of incidence through a hollow prism with different transparent fluids(i.e ., water,kerosene,sprit,turpentine oil) with angle of incidenceof30,35,40,45,50,55,60 degree.
Tuesday, June 17, 2014 at 5:52am

Physics
A motorist drives for 150 km from City A to City B in 2.5 hr. He makes the return trip in 2.0 hr. Find (a) the average speed for each half of the trip, (b) the average velocity for each half of the trip, (c) the average speed of the entire trip, and (d) the average velocity ...
Monday, June 16, 2014 at 10:28pm

Physics
An airplane takes off at 9:00 A.M. and flies at 300. km/h until 1:00 P.M. At 1:00 P.M. its speed is increased to 400. km/h, and it maintains this speed until it lands at 3:30 P.M. What is the airplane’s average speed for the entire flight?
Monday, June 16, 2014 at 10:27pm

Physics
Car is pulling a 3198kg trailer producing a accerlation of 0.2m/s2. Frictional force on the wheels is 740n. What is the applied force on the trailer?
Monday, June 16, 2014 at 10:25pm

General Physics 1
1) A car moving with an initial velocity of 29.6 m/s decreases to a velocity of 17.9 m/s over a time interval of 4.08 seconds. (a.) What is the average acceleration of the car during this time? (b.) Assuming the acceleration is constant, how far did the car travel during this ...
Monday, June 16, 2014 at 10:07pm

Physics
Two Kids pull opposite directions on a toy with a mass of 18kg. One exerts a force of 695N and the other 135N. Both pull horizontally and friction is void. Calculate the new force in N?
Monday, June 16, 2014 at 9:46pm

Physics
Sled accelerates at 2m/s^2. If net force is tripled and mass is doubled then what is the new acceleration of the sled?
Monday, June 16, 2014 at 9:42pm

Physics
a motor lifts a 12 kg mass to a height of 15 meters at a content velocity in 3.5 seconds. a) find the power b) if the motor is only 35% efficient find the input energy
Monday, June 16, 2014 at 9:04pm

Physics
A high diver of mass 70 kg jumps off a diving board and enters the water with the speed of 10 m/s the average upward resistance force of water exerts on the diver is 200 N. How far in the water will the diver travel before coming to rest?
Monday, June 16, 2014 at 8:17pm

Physics
An antitank weapons fires a 3.5 rocket, which acquires a speed of 70 m/s after traveling 90cm down a launching tube. Find the net force during lonch?
Monday, June 16, 2014 at 8:16pm

physics
A 5kg crate falls from height of 2 m into an industrial spring scale. When the crate comes to rest the compression of the spring is 25 cm what is the spring constant?
Monday, June 16, 2014 at 8:16pm

physics
An 80 kg stuntman jumps from the top of a building 23 m above a catching net. Assuming that air resistance exerts a 100 N force on the stuntman as he falls, determine his velocity just before he hits the net.
Monday, June 16, 2014 at 5:40pm

college physics
"The Magnitude of the buoyant force is equal to the weight of fluid displaced” is a statement of which principle in the study of fluids? Select one: a. Pascal's Principle b. Archimedes' Principle c. Bernouilli’s Principle d. The Equation of Continuity
Monday, June 16, 2014 at 5:17pm

physics
Which one of these statements regarding standing waves on a string is FALSE Select one: a. The frequency of the first harmonic depends on the tension in the string b. The frequency of the first harmonic depends on the speed of the wave c. The frequency does not depend on the ...
Monday, June 16, 2014 at 5:17pm

physics
Which one of the following statements about standing waves on a string is FALSE? Select one: a. All other frequencies are integer multiples of the first harmonic b. The first harmonic is the lowest frequency standing wave that can be formed. c. The first harmonic has the ...
Monday, June 16, 2014 at 5:16pm

physics
The Bernouilli equation is a statement of which physical principle? Select one: a. COnservation of Momentum b. Newton's Second Law c. Pascal's Principle d. Conservation of Energy
Monday, June 16, 2014 at 5:16pm

physics
A mass of 2.9 g is hanging underneath a spring which has an unknown spring constant. The period of oscillation is 5.5 seconds. Find the spring constant in N/m. Give your answer to 2 s.f.
Monday, June 16, 2014 at 5:16pm

Physics
An electric lawn mower has a resistance of 160 ohms and draws 15A. What is the cost of operating the lawn mower for 30 minutes if electrical energy costs $0.12/kWh?
Monday, June 16, 2014 at 5:02pm

Physics
A 66.2 kg person sits on the 5.3 kg sled (slope is on an angle, angle not given). It is to be pulled across the snow with a coefficient of friction equal to 0.12. What horizontal force is required to pill the sled at a constant speed?
Monday, June 16, 2014 at 4:47pm

physics
a copper wire has a diameter of o.5mm and resistivity of 1.6*10power 6 ohm cm.calculate the length of wire which will be necessary to make 10 ohm coil
Monday, June 16, 2014 at 11:18am

physics
if an object has covered first 30 m distance in 5 sec and other 40 m distance in 20 min.find the average speed in cgs system.
Monday, June 16, 2014 at 4:48am

physics please help!!!!!!
a mass is thrown vertically upwards with an initial velocity of 30m/s. a second mass is dropped 0.5s later from directly above a height of 60m from the first mass. when do they meet and at what height?
Monday, June 16, 2014 at 2:51am

physics
a man moves 2km/hour and rain has started now falling with 2km/hour at what angle should umbrellla be kept so that man can not go wet
Monday, June 16, 2014 at 2:05am

Physics
Josh starts his sled at the top of a 3.0m high hill that has a constant slope of 25 degrees. After reaching the bottom, he slides across a horizontal patch of snow. The hill is frictionless but the coefficient of kinetic friction between his sled and the snow is .05. How far ...
Monday, June 16, 2014 at 1:00am

Physics
The diagram shows a weightlifter in the initial stages of his lift. He lifts two 70 kg masses connected to a 10 kg bar. In addition, there are two upward forces : 795N and 810N a. Calculate the total weight that he is lifting? b. Calculate the size of the acceleration of the ...
Sunday, June 15, 2014 at 10:35pm

physics
If h is 5m and the mass takes 3 s to move the distance d when starting from rest, what is the distance d? PLEASEEEEEE!!!!
Sunday, June 15, 2014 at 9:58pm

Physics
To qualify for the finals in a racing event, a race car must achieve an average speed of 225 km/h on a track with a total length of 1.4 km. If a particular car covers the first half of the track at an average speed of 205 km/h, what minimum average speed must it have in the ...
Sunday, June 15, 2014 at 9:33pm

Physics
In 1926, Johnny Weissmuller set the men’s world 400.0-m swimming record in 4.00 min, 57.0 s. In 1966, Martha Randall set the women’s record in 4.00 min, 38.0 s. By how many meters would Martha have been beaten Johnny if they had raced each other?
Sunday, June 15, 2014 at 9:32pm

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