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July 29, 2014

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Recent Homework Questions About Physics

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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

physics
a strong 100 kg man pushes down hard on the left piston. What happenes to the 10 kg mass on the right? The answer is the moves down, lifting the left piston despite the strong man. BUT WHY?
Sunday, June 15, 2014 at 4:26pm

physics
A submarine dives down to a depth 9.5 beneath the surface of the ocean. Calculate the pressure in atmospheres at that depth, assuming the density of water is 1029 kg/m3, and the air pressure at the surface is 101.5 kPa
Sunday, June 15, 2014 at 2:35pm

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.
Sunday, June 15, 2014 at 2:21pm

physics
A spring and mass system are oscillating with an amplitude of 8.4 cm. The spring constant is 204 N/m and the mass is 540 g. Find the mechanical energy of the system to 2 sf.
Sunday, June 15, 2014 at 2:21pm

physics
Which one of the following statements about an object performing Simple Harmonic Motion is TRUE? Select one: a. The object reaches its maximum speed as it passes through the equilibrium point. b. The object’s velocity is never zero. c. The object has a constant velocity. ...
Sunday, June 15, 2014 at 1:56pm

physics
as Sue runs, her knee joint passes through the following vertical positions (meters): Frame 1: .043 Frame 2: .145 Frame 3: .21 Frame 4: .39 Frame 5: .415 The data were collected at a frequency of 100 Hz. What was the vertical velocity of her knee joint at the 2nd time point?
Sunday, June 15, 2014 at 1:53pm

physics
a skater is sliding forward on a flat rink at 6 m/s. her mass is 71 kg. the sliding friction acting on her skate blade is 13.4 N acting backward. air resistance is 14.7 N acting backward. what is her horizontal acceleration?
Sunday, June 15, 2014 at 1:35pm

physics
a string supports a solid iron object of mass 180g totally immersed in liquid of density 800kg/m3. calculate the tension in the string if the density of iron is 8000kg/m3.
Sunday, June 15, 2014 at 11:35am

physics
a box of treasure with a mass of 92 kg and volume of 0.031metrecubic lies at the bottom of the ocean.how much force is needed to lift it?
Sunday, June 15, 2014 at 10:53am

physics
If two stones projected from the same point with the same speed but at angles pi/3 and pi/6 respectively have their ranges R₁ and R₂ then a)R1=2R2 B)R1=R2 C)R1=5R2 D)R1=25R2
Sunday, June 15, 2014 at 2:27am

physics
a pendelum in a fathers clock measures .90m from the support to the centerof the bob
Sunday, June 15, 2014 at 1:09am

Physics
Assuming the best high jump record from a standingposition in a school was 1.52 m, what initial velocity was needed for this jump? Neglect any sideways motion.
Sunday, June 15, 2014 at 12:20am

Physics
A 0.2kg ball is attached to a rope and is whirled in a horizontal circle. Calculate the maximum speed of the ball if the length of the rope is 0.8m and its breaking strength is 0.9N
Saturday, June 14, 2014 at 11:22pm

Physics
A wheel with radius of 25cm turning at 120 rpm uniformly increases its frequency to 660 rpm in 9s. Determine: i) the centripetal acceleration ii)the total acceleration of the system
Saturday, June 14, 2014 at 11:16pm

Physics
The rocket sled shown in Figure 4.5 accelerates at a rate of 29.0 m/s2. Its passenger has a mass of 66.0 kg. Calculate the direction and magnitude of the total force the seat exerts against his body.
Saturday, June 14, 2014 at 10:46pm

Physics
Two teams of nine members each engage in a tug of war. The first team's members have average masses of 67 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 72 kg and exert average forces of 1361 N horizontally. (a) ...
Saturday, June 14, 2014 at 10:24pm

Physics
A 45-t electric train accelerates uniformly from a station with the train’s motion depicted in the graph in Figure 2.(Recall that 1 t = 1.0 × 103 kg.)Determine the net force acting on the train during the uniform acceleration portion of the motion.
Saturday, June 14, 2014 at 7:58pm

physics
The cg of the 50.0 N pole held by the pole vaulter is 2.00 m from the left hand, and the hands are 0.700 m apart. Calculate the force exerted by each hand.
Saturday, June 14, 2014 at 5:41pm

physics
You have an spring gun. The end of the gun is at 1 meter above the ground. This gun is shoot horizontally with no air resistance. The cannon ball hits the ground 1.32 meters ahead from it was shoot. What is the cannon ball's initial velocity?
Saturday, June 14, 2014 at 5:18pm

Physics
A person is carrying a plank of wood 2.00 m long with one hand pushing down on it at one end with a force F1 and the other hand holding it up at 50.0 cm from the same end of the plank with force F2. If the plank has a mass of 20.0 kg and its center of gravity is at the middle ...
Saturday, June 14, 2014 at 5:13pm

Physics
The Yukon Quest, an annual dog-sled race between Whitehorse in the Yukon and Fairbanks in Alaska, covers a gruelling distance of 1.61 × 103 km. Assuming that the average speed of the dog team that set a course record is 6.28 km/h, determine the best time for this race. ...
Saturday, June 14, 2014 at 12:50pm

Physics
An unknown mass has an acceleration of 2 m/s2 to a 1 kg body.if the same force accelerate another body of 8 m/s2 .what is the mass of the body?
Saturday, June 14, 2014 at 9:04am

Physics
A 10 kg is acted upon by a force of 90 N .What acceleration is imparted?
Saturday, June 14, 2014 at 9:01am

PHYSICS
racing car accelerates uniformly. changes with following average speeds 20m/s for 2sec ;40m/sec for 2s and 60m/s for 6sec . what is overall average speed of car
Saturday, June 14, 2014 at 5:43am

Physics
A 0.020 rubber stopper is swung in a horizontal circle by 0.80 cm thread that makes 30.0 revolution every 20 seconds. a.) what is the stopper's speed? T=? v=(2pi(r))/T
Saturday, June 14, 2014 at 12:16am

Physics
An object is 30.0 cm to the left of a convex lens with a focal length of +8.0 cm. Calculate the distance from the lens. Would it be upright or inverted?
Friday, June 13, 2014 at 9:45pm

PHYSICS
IF EARTH WERE TO ROTATE FASTER THAN ITS PRESENT SPEED THEN WEIGHT PF OBJECT WILL DECREASE AT EQUATOR BUT REMAIN UNCHANGED AT POLES why?
Friday, June 13, 2014 at 2:09pm

PHYSICS
if force acts on body WHOSE ACTION LINE does not Passes through its center of gravity then body will experience A ANGULAR ACCELERATION b linear acceleration C ZERO ACCELERATION D ZERO ACCELERATION
Friday, June 13, 2014 at 1:46pm

Physics
Okay last question I need help with Monochromatic light of 605 nm falls on a single slit, which is located 85 cm from a screen. The first dark band appears at 5.4 mm from the center. How wide is the slit? 0.001 mm 0.050 mm 0.095 mm 1.50 mm
Friday, June 13, 2014 at 1:08pm

Physics
A singer moves a note up one octave. How has the sound changed? The amplitude has decreased The wavelength has increased The speed has increased The frequency has increased <-- im not sure, but i'm thinking that it's this one
Friday, June 13, 2014 at 12:58pm

Physics
A forklift exerts an upward force of 2.00*10^3 N on a box as it moves the box 5.00 m higher. How much work does the forklift do? 500 J 1.00*10^3 J 1.00*10^4 J <--- 0.00 J
Friday, June 13, 2014 at 12:46pm

Physics
How would i solve this? A 10.0 kg ball falling at 10.0 m/s hits a pile of feathers and comes to a complete stop in 10 s. What force does the pile of feathers exert to stop the ball? 10 N 20 N 100 N 200 N
Friday, June 13, 2014 at 11:37am

physics
A person standing on top of a building throws a ball with a horizontal velocity of 14 m/s. If the ball strikes the ground 65 m from the base of the building, how high is the building?
Friday, June 13, 2014 at 10:10am

Physics
an ice block at 0 degree celcius is dropped from height 'h' above the ground. what should be the value of 'h' so that it just melts completely by the time it reaches the bottom assuming the loss of whole gravitational potential energy is used as heat by the ice...
Friday, June 13, 2014 at 10:04am

PHYSICS
ANGULAR VELOCITY OF SECOND HAND OF WATCH IS a 2pi /30sec B pi/30sec C pi/60sec D PI/1800
Friday, June 13, 2014 at 9:14am

PHYSICS
monkey is accelerating down string whose breaking strength is two third of its weight the min acceleration of monkey should be A 1/3g B 2/3g C G d ZERO
Friday, June 13, 2014 at 9:09am

physics
on a trip a car covers 42.3 miles in 40.0 minutes. find the average velocity in m/s and km/hr
Friday, June 13, 2014 at 9:02am

physics
A car of mass 537 kg is moving 32.0° North of East at a speed of 22.7 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction)
Friday, June 13, 2014 at 8:11am

Physics
Identical point charges of +1.1 ¦ÌC are fixed to three of the four corners of a square. What is the magnitude q of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner experiences a net force of ...
Friday, June 13, 2014 at 3:49am

Physics
A proton and an electron are moving due east in a constant electric field that also points due east. The electric field has a magnitude of 8.0 ¡Á 104 N/C. Determine the magnitude of the acceleration of the proton and the electron.
Friday, June 13, 2014 at 3:46am

physics
The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.) (a) Find the magnitude of the force of friction between the wall and the strut. (b) Find the normal force exerted by...
Thursday, June 12, 2014 at 7:54pm

physics
If the coaster is going to make it to point C it needs to start with some initial velocity. If point C is 21 meters high and the coaster starts at a height of 20 meters, what would its initial velocity need to be if no energy is lost to friction?
Thursday, June 12, 2014 at 7:48pm

physics
(a) Find the force P that must be applied to a piston of area 10.60 cm2 to produce sufficient fluid pressure to support a car weighing 12,101 N by means of a column of fluid of cross sectional area 285 cm2 as seen in the figure below. F1/A1=F2/A2 F1=F2*A1/A2 12101*10.6/285 =...
Thursday, June 12, 2014 at 7:37pm

Physics
An object with mass 3.0 kg is executing simple harmonic motion, attached to a spring with spring constant k =210 N/m. When the object is 0.23 m from its equilibrium position, it is moving with a speed of 0.72 m/s. (a) Calculate the amplitude of the motion. m (b) Calculate the ...
Thursday, June 12, 2014 at 3:17pm

Physics
A 7.50 kg bowling ball strikes a stationary 4.50 kg bowling ball. After the collision, the 4.50 kg ball is traveling 8.50 m/s 30.0° east of north; the 7.50 kg ball is traveling 6.50 m/s 20.0° south of east. What was the initial velocity (magnitude and direction) of the...
Thursday, June 12, 2014 at 3:16pm

physics
A mass m is gently placed on the end of a freely hanging spring. The mass then falls 21.3 cm before it stops and begins to rise. What is the frequency of the oscillation? I found the same question (with a different length) posted on here, but following the steps of the answer ...
Thursday, June 12, 2014 at 3:00pm

physics
A spring is stretched by 0.72 m from its orginal length with an external force of 10.5. What is the spring constant, k, of the spring?
Thursday, June 12, 2014 at 2:53pm

physics
A boy on ice skates is atationary on a frozen lake(no friction).He throws a package of mass 5kg at 4m/s horizontally east.the mass of the boy is 60kg.at the instant the package leaves the boy's hand,the boy starts moving. Calculate the magnitude of the velocity of the boy ...
Thursday, June 12, 2014 at 1:40pm

Physics
Three resistors of value 1.0 , 2.0 and 4.0 are connected in a parallel circuit with a 6.0 V battery. a) What is the total equivalent resistance? b) What is the across each resistor? c) The power delivered to the 4.0 resistor?
Thursday, June 12, 2014 at 1:14pm

Physics
3) What is the emf of a battery with an internal resistance of 0.15 if the battery delivers 1.5 A to an externally connected 5.0 resistors?
Thursday, June 12, 2014 at 1:03pm

physics
A 200 – W computer power supply is on 10 hours per day. If the cost of electricity is $0.15/kWh, what is the cost (to the nearest dollar) to run the computer every day for a year (365 days)?
Thursday, June 12, 2014 at 12:51pm

physics
A nut-cracker has arms o.4mlong and a nut is plsaced 0.05 from the hinge. Calculate the resistance of the shell if it is broken by a force of 100N applied at the end of the cracker(assume that all the forces are parallel)
Thursday, June 12, 2014 at 12:24pm

physics
A pole AB of length 10m and weight 600N has its centre of gravity 4m from the end A, and lies on horizontal fround.calculate the force required to begin to lift the end.why would this force applied at the end A,not be sufficient to lift the end A?
Thursday, June 12, 2014 at 12:21pm

physics
A nut-cracker has arms o.4m long and a nut is placed 0.05m from the hinge. Calculate the resistance of the shell if it is broken by a force of 100N applied at the end of the cracker(Assume that all forces are parallel)
Thursday, June 12, 2014 at 12:17pm

Physics
A man was lost in the woods. He wanders 3 km north, then 7 km east, then 7 km south, then 4 km west. What is the magnitude and direction of his resultant displacement?
Thursday, June 12, 2014 at 9:46am

Physics
Merry go round is push by a 100 kg man Radius is 2 m how much force is exerted. Maximum force in newtons
Thursday, June 12, 2014 at 8:41am

physics
A uniform ladder AB leans against a smooth vertical wall at an angle 60degree to the horizontal.the weight of the ladder is 200N. By taking moments about a suitable point,calculate the reaction at the wall
Thursday, June 12, 2014 at 7:33am

physics
A pole AB of length 10m and weight 600N has its centre of gravity 4m from the end A,and lies on horizontal ground. Calculate the force required to beging tto lift the end. Why would this force applied at the end A not be sufficient to lift the end A
Thursday, June 12, 2014 at 7:04am

physics
An aeroplane taking off from a field has a run of 500 meters. What is the acceleration and take off velocity if it leaves the ground 10 seconds after the start ?
Thursday, June 12, 2014 at 3:14am

physics
A nut-cracker has arms o.4m long and a nut is placed 0.05m from the hinge. Calculate the resistance of the shell if it is broken by a force of 100N applied at the end of the cracker(Assume that all forces are parallel)
Thursday, June 12, 2014 at 2:40am

physics
A uniform ladder AB leans against a smooth vertical wall at an angle 60degree to the horizontal.the weight of the ladder is 200N. By taking moments about a suitable point,calculate the reaction at the wall
Thursday, June 12, 2014 at 2:38am

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