Sunday
February 19, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Look at the graph below measuring the speed of a truck and answer the following 2 questions: a) If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which. b) Based on what the y axis measures, explain the motion ...
Monday, January 30, 2017 by hello

physics
a uniform meter bar of mass 120kg is sup ported on two knife edges 30cm from its center, with a diagram calculate the reactions at these supports when a 160kg mass is suspended 20cm from the center of gravity of the bar towards the left end
Monday, January 30, 2017 by David

Physics
The sum of two point charges is +11μC. When they are 2.7cm apart, each experiences a force of 224 N. Find the charges given that the force is: a) repulsive b)attraction
Monday, January 30, 2017 by Moren

physics
A 200.0N steel box resting on a smooth surface is pushed to the right by a force of 50N, if the coefficients of starting and sliding friction are 0.74 and 0.53 respectively will the box move and if so what force isrequired to keep it moving at constant speed?
Monday, January 30, 2017 by David

Physics
what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start..
Monday, January 30, 2017 by Stacy

Grade 11 Physics: Forces
A girl pushes a wooden box across a floor and exerts 140 N to keep the box moving at constant velocity. If the kinetic coefficient of friction is 0.55, find the mass of the box.
Monday, January 30, 2017 by Katie

Physics
The initial velocity, the final velocity, and the time are given. Using one of the equations of kinematics, you can calculate the displacement directly. An airplane starts from rest and reaches a takeoff velocity of 60.0 m/s due north in 4.0 s. How far has it traveled before ...
Monday, January 30, 2017 by Ana

Physics urgent help please
A rectangular coil 60mm × 40mm with 25 turns is positioned with its longer sides parallel to a long straight vertical wire carrying a current of 6.8A. The coil is placed so that its long sides and the vertical wire are in the same vertical plane, with the wire 40mm away from ...
Monday, January 30, 2017 by Katherine .Mk

physics
The mass of ball A is 10 kilograms and the mass of ball B is 5 kilograms. If the initial velocity is set to 3 meters per second for each ball, what is the final velocity of ball B if the final velocity of ball A is 2 meters per second?Use the elastic collision equation to find...
Monday, January 30, 2017 by NBA Youngboy

Physics
A girl runs up a stairway that is 6m high with a 500g book, her mass is 70kg. Take g=10m/s2 calculate (a) weight of the book (b) weight of the girl (c) the total work done by the girl when she reaches the top
Monday, January 30, 2017 by Godfrey

physics
A typical car under hard braking loses speed at a rate of about 6 m/s2. The typical reaction time to engage the brakes is 0.50 s. A local school board sets the speed limit in a school zone such that all cars should be able to stop in 5.0 m. What maximum speed does this imply ...
Monday, January 30, 2017 by Nidhi

physics
is the height of a ball be thrown directly related to the initial velocity? if i were to graph initial velocity as y and height as x,would it be a linear trend?
Sunday, January 29, 2017 by Anthony

physics
A car traveling at 100 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00 g = 9....
Sunday, January 29, 2017 by david

physics
starting from rest, a car accelerates at a constant rate of 3 m/s^2for a time of 5 s; a. compute the velocity of the car at 1 s, 2 s,3 s, 4 s, and 5 s and plot these velocity values against time. b. compute the distance traveled by the car for these same times and plot ...
Sunday, January 29, 2017 by sumaiya

Physics
Two spheres are cut from a certain uniform rock. One has radius 3.54 cm. The mass of the other is 3 times greater. Find its radius.
Sunday, January 29, 2017 by Student

Physics
The velocity graph of a particle moving along the x-axis is shown. The particle has zero velocity at t=0.00s and reaches a maximum velocity, vmax, after a total elapsed time, t total. If the initial position of the particle is x0 =6.22m, the maximum velocity of the particle is...
Sunday, January 29, 2017 by Mary

physics
A piece of copper ball of mass 20g at 200°c is placed in a copper calorimeter of mass 60g containing 50g of water at 30°c ignoring heat losses.calculate the final steady temperature of mixture.(specific heat capacity of water=4.2jg-1k-1)
Sunday, January 29, 2017 by Abiodun

Physics
A dram of mass 100kg is rolled into the deck of long 1.5m above a horizontally floor using a plank 4m long.calculate the work done against gravity during the process [Take g=10ms'2]
Sunday, January 29, 2017 by Yegh margaret

Physics
Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 38 km away, 19deg north of west, and the second team as 28.7 km away, 35deg east of north. When the first team uses its...
Sunday, January 29, 2017 by Sarah

Physics
A baseball hit just above the ground leaves the bat at 27 m/s at 45∘ above the horizontal. A)How far away does the ball strike the ground? B)How much time is the ball in the air? C)What is its maximum height? Find the time for the ball to go the horizontal distance to home ...
Sunday, January 29, 2017 by Anonymous

Physics
You drive 109 km/h east for 31 min , then 82 km/h north for 42 min . Let the +x-axis point east and the +y-axis north. A)Find your average velocity for the entire trip. B)Find your average speed for the entire trip. You should probably do part b first. Find the vertical ...
Sunday, January 29, 2017 by Anonymous

Physics
On the map, let the +x-axis point east and the +y-axis north. A)An airplane flies at 990 km/h northwestward direction (i.e., midway between north and west). Find the components of its velocity. B)Repeat for the case when the plane flies due south at the same speed. To find the...
Sunday, January 29, 2017 by Anonymous

Physics
How much force does it take to push an 80 lb. steel cart on wheels?
Sunday, January 29, 2017 by Patty

Physics
A boy kicks a rock off a cliff with a speed of 15.5m/s at an angle of 53.5° above the horizontal. The rock hits the ground 5.37s after it was kicked. How high is the cliff? I found the height of the cliff which is 7.45*10^1 m. What is the speed of the rock right before it ...
Sunday, January 29, 2017 by Sarah

Physics
A cannon ball is fired horizontally from a cannon that is 40.7m above the ground. The initial velocity of the cannon ball is 234m/s. How much time does the cannon ball spend in the air?
Sunday, January 29, 2017 by Mary

Physics
for an egg drop project, does putting straws at the bottom of an egg protect it from crashing?
Sunday, January 29, 2017 by Anonymous

physics
An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range
Sunday, January 29, 2017 by tsering

Physics
determine the magnitude and direction of the net force acting on q0 where q0=1uC ,q1=-1uC,q2=2uC and q3=-4
Sunday, January 29, 2017 by Jay

Physics
state the finctions of double wall,silver wall and cork sttoper -
Sunday, January 29, 2017 by Busola

physics
Uranium 235 has 92 protons in its atoms. Calculate the number of neutrons in this atom
Sunday, January 29, 2017 by Sakshhi Siingh

solar science physics
Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. What is the total capacity of energy in watt-hours that can be stored in the battery?
Sunday, January 29, 2017 by pritam

solar science physics
Which of the following statements is NOT true about solar inverters? A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads. An ideal grid-tied inverter has its operational voltage and frequency synchronized with those of the grid...
Sunday, January 29, 2017 by pritam

physics
A boat traveling at 116.5 m/s relative to the water aims to go straight across a river. If the river is 153 m wide and the current in the river is 3.50 m/s, how far downstream will the boat land on the other side of the river? Calculate the answer in meters (m) and rounded to ...
Sunday, January 29, 2017 by Dalia

solar science physics
On the left-hand side of the figure below a III-V triple junction solar cell is shown. On the right-hand side, the J-V curves of the individual component cells and the multi-junction solar cell are shown. Which junction corresponds to sub cell 3?
Sunday, January 29, 2017 by pritam

Physics
You want to jump from an 8.2 m high building to a 10 m high building. The gap between the buildings is 2.4 m, and you can run fast enough so that your speed as you leave the edge of the lower building is 7.0 m/s. What range of launch angles will allow you to reach the top of ...
Saturday, January 28, 2017 by Ben

Physics
An amount of ideal gas is placed in a sealed rigid cylinder. The container is initially placed in boiling water. It is quickly removed and placed in ice-water bath. Draw this thermodynamic process on a PV diagram. If the question change to An amount of ideal gas is in a ...
Saturday, January 28, 2017 by Lee

physics
A particular spiral galaxy can be approximated by a thin disk-like volume 35 Thousand Light Years in radius and 8 Hundred Light Years thick. If this Galaxy contains 790 Billion stars, estimate the average distance between the stars in this galaxy. Hint: calculate the average ...
Saturday, January 28, 2017 by Space problem, show work

physics
A particular spiral galaxy can be approximated by a thin disk-like volume 35 Thousand Light Years in radius and 8 Hundred Light Years thick. If this Galaxy contains 790 Billion stars, estimate the average distance between the stars in this galaxy. Hint: calculate the average ...
Saturday, January 28, 2017 by humbrey

Physics
The velocity graph of a particle moving along the x-axis is shown. The particle has zero velocity at t=0.00s and reaches a maximum velocity, vmax, after a total elapsed time, t total. If the initial position of the particle is x0 =9.35m, the maximum velocity of the particle is...
Saturday, January 28, 2017 by MC

science physics solar
A given monocrystalline silicon solar cell has the following specifications: Isc=5A Voc=0.6V 72 identical cells with the above specifications are to be interconnected to create a PV module. What is the open-circuit voltage (in V) of the PV module if all the solar cells are ...
Saturday, January 28, 2017 by pritam

science physics solar
In state-of-the-art crystalline silicon solar cells technology, based on p-type silicon, a back surface field (BSF) is implemented. This BSF is implemented, because in this way: The barrier for hole collection at the back contact is reduced, increasing the surface ...
Saturday, January 28, 2017 by pritam

solar science physics
In state-of-the-art crystalline silicon solar cells technology, based on p-type silicon, a back surface field (BSF) is implemented. This BSF is implemented, because in this way:
Saturday, January 28, 2017 by pritam

science physics solar
We have discussed that a bare crystalline silicon surface contains many defects which act as SRH recombination centers. How can the surface recombination at the air/n-silicon interface be reduced?
Saturday, January 28, 2017 by pritam

Physics
A 5.0 uF capacitor is charged to a p.d of 10v. It is then removed from the supply and connected in parallel with an uncharged 20 uF capacitor. Calculate the charge on each capacitor after connection (My working so far, 5×10^-6×10=5×10^-5C )I am stumped on what to do any ...
Saturday, January 28, 2017 by Saad

Physics
Half life of radium is 44 years.The sample will reduce to 50% of its orignal value after how many years?
Saturday, January 28, 2017 by Salman

Physics
Two forces 18N and 10N are inclined at right angle of 60° to each other. calculate (i) the resultant force (ii) the angle of resultant forces that makes the force of 10N.
Saturday, January 28, 2017 by Gabby

physics
fastest measured pitched baseball left the pitchers hand at speed of 45 m/s. if the pitcher was in contact with the ball at a disturbance of 1.50 m and produced constant acceleration. a.what accelerate did he gave the ball? b.how much time did it take him to pitch?
Saturday, January 28, 2017 by jenelyn

Physics
A body is dropped from rest from a height of 8m. How long does it take to reach the ground?
Saturday, January 28, 2017 by Prince

physics
IF a particular galaxys has a total mass of 10 to the 56 grams and the average star in that galaxy has a mass of 10 to the 35 grams, approximately how many stars are there in that galaxy? Give your answer to the nearest whole power of 10 by entering the exponent only. A ...
Saturday, January 28, 2017 by arias

physics
1.A certain spacecraft is 3.3 AU (Astronomical Units) from Earth. How long in seconds does it take for a signal to reach the Earth after it is transmitted from the spacecraft? Hint: An AU is about 149.9 Million Km, and light moves at 299,800 Km/s. {Indicate your answer to the ...
Saturday, January 28, 2017 by jere

psych
Identify each of the following consequences either positive reinforcement (PR), negative reinforcement (NR), negative punishment (NP) or positive punishment (PUN). NP 1. A teacher meeting with a parent makes that parent feel less powerful by having her sit on small, ...
Friday, January 27, 2017 by SAM

Physics
Im doing an egg car crash project, is there any tips and tricks to protect your egg in a made car?
Friday, January 27, 2017 by Joe

Physics
A 62 kg person is skiing down a 37 degree slope that has a coefficient of 0.15. what is their velocity after 5.0 seconds
Friday, January 27, 2017 by Anonymous

physics
Whn sand is poured on a rotatory disc what happens to its angular velocity. Explain
Friday, January 27, 2017 by pooja

physics
The third floor of a house is 6 m above street level. How much work is needed to move a 141 kg refrigerator to the third floor?
Friday, January 27, 2017 by Anonymous

Physics
A uniform rod of mass 2 kg and length 1.41 m is hinged at its top end and allowed to swing in the vertical plane of the paper. It is initially stationary in a vertical position. A clay ball of mass 0.25 kg is propelled towards its lower end at a speed v. The ball sticks to the...
Friday, January 27, 2017 by Abdus-Samad Gaffoor

Physics
Two movers are attempting to push a 300kg piece of furniture across the floor. One man pulls horizontally with a force of 45N while the other pulls with 80N at a 25 degree angle. If the crate slides with an acceleration of 9.15m/s^2, what is the frictional force between the ...
Friday, January 27, 2017 by Joe

physics
particle P and Q are undeergoing uniform horizotal circular motion along concentric circle of different radii in clockwise sense . pcomplete each round in 2 min while q does in 5 min. time required by q to make one revolution around P
Friday, January 27, 2017 by satya

Physics
A car mass of 900kg travelling at 15m/s crashes into a wall and comes to rest in 0.3s. Calculate the average decelaration. Calculate the average force exerted
Friday, January 27, 2017 by James

physics
a certain coiled spring with an unstretched length of 20cm require a force of 2N to stretch it by 0.2cm. What is the work done in stretching it by 2cm. If the elastic limit is nt execeed.
Thursday, January 26, 2017 by Anonymous

Physics
Sorry if it is alot of questions 1. A crate falls from an airplane flying horizontally at an altitude of 2000 m. Neglecting air resistance, about how long will the crate take to strike the ground? a. 10 seconds b. 20 seconds c. 400 seconds d. 100 seconds 2. An object is ...
Thursday, January 26, 2017 by Alex Graham

Physics
1. Which statement below is true? a. If a car is traveling eastward, its acceleration is eastward. b. If a car's speed is decreasing, its acceleration must be negative. c. If a particle is moving, it must have a non-zero acceleration. d. A moving particle with constant ...
Thursday, January 26, 2017 by Alex Graham

Physics
What is the difference between acceleration, speed and velocity?
Thursday, January 26, 2017 by Mike Smith

physics
The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which ...
Thursday, January 26, 2017 by Tyler

physics
Car A uses tires for which the coefficient of static friction is 0.222 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 19.5 m/s. Car B uses tires for which the coefficient of static friction is 0.670 on the same curve. What is ...
Thursday, January 26, 2017 by Tyler

physics
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
Thursday, January 26, 2017 by Tyler

physics
A computer is reading data from a rotating CD-ROM. At a point that is 0.0302 m from the center of the disk, the centripetal acceleration is 284 m/s2. What is the centripetal acceleration at a point that is 0.0803 m from the center of the disc?
Thursday, January 26, 2017 by Tyler

physics
Computer-controlled display screens provide drivers in the Indianapolis 500 with a variety of information about how their cars are performing. For instance, as a car is going through a turn, a speed of 87.5 m/s and centripetal acceleration of 2.48 g (2.48 times the ...
Thursday, January 26, 2017 by Tyler

Physics
The fastest major league pitcher throws a ball at 41.0 m/s . If he throws the ball horizontally, how far does it drop vertically on the 19.7 m trip to home plate?
Thursday, January 26, 2017 by Anonymous

Physics
A baseball hit just above the ground leaves the bat at 27 m/s at 45∘ above the horizontal. How far away does the ball strike the ground? How much time is the ball in the air?
Thursday, January 26, 2017 by Anonymous

Physics
You drive 109 km/h east for 31 min , then 82 km/h north for 42 min . Let the +x-axis point east and the +y-axis north. Find your average velocity for the entire trip. Find your average speed for the entire trip.
Thursday, January 26, 2017 by Anonymous

Physics
On the map, let the +x-axis point east and the +y-axis north. An airplane flies at 990 km/h northwestward direction (i.e., midway between north and west). Find the components of its velocity. Repeat for the case when the plane flies due south at the same speed.
Thursday, January 26, 2017 by Anonymous

Physics
You drive due east at 77 km/h for 55 min . Then you follow a road going 60∘ south of east, going 96 km/h for another 28 min . Find your total displacement.
Thursday, January 26, 2017 by Anonymous

Physics
On level ground, you stand 27.0 m from the base of a tree and determine that the treetop is at 39 ∘ above the horizontal, as measured from ground level. How tall is the tree?
Thursday, January 26, 2017 by Anonymous

Physics
A .324 kg air track glider moves linearly with an initial speed of 1.37 m/s.In order to increase the speed of the mass, 7.31 J of work are done. What is the final speed of the glider? (Ignore the negligible friction)
Thursday, January 26, 2017 by Anonymous

physics
Two forces parallel to the x-axis do 14.7 J of work on a small tray while moving it 20.7 m in the x direction across the gym floor. One of the forces has a value of +3.89 N in the x direction. What is the other force?
Thursday, January 26, 2017 by Anonymous

Physics-Momentum
A Toyota of mass 1500 kg is driving at 15 m/s North when it rear-ends a Cadillac of mass 2500 kg also moving North at 9 m/s. (The driver of the Toyota was probably texting) After the collision, the Toyota bounces back at 2 m/s. What is the speed of the Cadillac after the ...
Thursday, January 26, 2017 by Mike Smith

physics
There is a clever kitchen gadget for drying lettuce leaves after you wash them. It consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. The outer wall of the cylinder is perforated with small holes. You put the wet ...
Thursday, January 26, 2017 by Tyler

physics
Speedboat A negotiates a curve whose radius is 140 m. Speedboat B negotiates a curve whose radius is 295 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of the boats?
Thursday, January 26, 2017 by Tyler

physics
A car travels at a constant speed around a circular track whose radius is 2.66 km. The car goes once around the track in 200 s. What is the magnitude of the centripetal acceleration of the car?
Thursday, January 26, 2017 by Tyler

Physics
two collinear harmonic oscillation x1=8sin(100pie(t)) and x2=12sin(96pie(t)) are superposed.calculate the *maximum and minimum amplitudes *the frequency of amplitude modulation
Thursday, January 26, 2017 by Jkss

Physics
two collinear harmonic oscillation x1=8sin(100pie(t)) and x2=12sin(96pie(t)) are superposed.calculate the value of time when the amplitude of the resultant oscillation will be *maximum and minimum?
Thursday, January 26, 2017 by Jkss

physics
A swimmer can swim in stillwater at a rate 4 kilometre per hour. If he swims in a river flowing at 3 kilometre per hour and keeps his direction with respect to water perpendicular to the current,find his velocity city with respect to the ground
Thursday, January 26, 2017 by dhandip

physics
A long straight vertical wire of diameter 2.0mm carries a steady current upwards. At 30mm from the centre of the wire, the magnetic field strength is 0.10mT. Sketch a graph to show the variation of magnetic field strength from the wire surface to a distance of 40mm from the ...
Thursday, January 26, 2017 by Jake

Physics
You drop a rock into a deep well. You can't see the bottom of the well but you can hear the impact after T seconds. Suppose the speed of sound is c feet per second and the depth of the falling rock at time t is gt^2/2 feet. Compute the depth d of the well. Your answer will be ...
Thursday, January 26, 2017 by Anon

physics
In the physics equation F=qE, where E is the electric field, q is the charge, and F is the force that the electric field exerts on this charge, does the charge, q, by itself have a direction associated with it? Why or why not?
Thursday, January 26, 2017 by damien

physics
A treasure map instructs you to walk 34 m south, 117 m east, followed by 64.5 m north, and finally 28.5 east. Determine the magnitude of your total displacement in m.
Wednesday, January 25, 2017 by Dalia

Physics
A 1400 kg car travels up a 20 degrees incline. The car exerts a constant force of 30,000 N across 100m. The car starts from rest at the bottom of the incline. The car takes 10 minutes to do this. How much work is done by the car?
Wednesday, January 25, 2017 by Anonymous

Physics
Convert to m/s 40m/min
Wednesday, January 25, 2017 by Anonymous

Physics
a boat sails 150km N60°E, then 100km West. What is it's displacement from its starting point?
Wednesday, January 25, 2017 by Victor

PHYSICS
An object is projected horizontally on a floor at 100ft/s. It then decceledates at 10ft/s2. After 5sec what are a.the speed of the body b. The distance it traversed
Wednesday, January 25, 2017 by yong

Physics
A ball is thrown vertically upward with a speed of 31.1m/s. What is the ball's velocity after 2.70s?
Wednesday, January 25, 2017 by MC

physics
An automobile moving northward with a velocity of 270m/s is brought to rest in 45 seconds . find the average acceleration durong this time interval. express the answer in ft/sec^2
Wednesday, January 25, 2017 by elleso

physics
A car moving at 55mi/hr needs to slow down to speed 35mi/hr to round a curve in the highway. if the rate it slows down is 13.5mi/hr^2 how far does it travel while reducing speed?
Wednesday, January 25, 2017 by elleso

Physics 1
An airplane traveling horizontally at 367 km/hr at a height of 1 km releases a bomb. How far ahead (to the nearest meter) from the release point does the bomb strike the ground?
Wednesday, January 25, 2017 by Srecko

Physics
A car having constant speed 50kmph.want overtake truck having constant speed of 20kmph what will be the time taken by car to overtake truck.??
Wednesday, January 25, 2017 by Nilesh

physics
A long straight vertical wire of diameter 2.0mm carries a steady current upwards. At 30mm from the centre of the wire, the magnetic field strength is 0.10mT. Sketch a graph to show the variation of magnetic field strength from the wire surface to a distance of 40mm from the ...
Wednesday, January 25, 2017 by Steven

physics
An unstable nucleus with a mass of 18.0 ✕ 10-27 kg initially at rest disintegrates into three particles. One of the particles, of mass 5.0 ✕ 10-27 kg, moves along the positive y-axis with a speed of 9.0 ✕ 106 m/s. Another particle, of mass 7.4 ✕ 10-27 kg, moves along ...
Tuesday, January 24, 2017 by jake

physics
Two cars (A and B) of mass 1.1 kg collide. Car A is initially moving at 18 m/s, and car B is initially moving in the opposite direction with a speed of 9 m/s. The two cars are moving along a straight line before and after the collision. (Enter the magnitudes.) If the two cars ...
Tuesday, January 24, 2017 by jake

Physics
If the current in a wire is directed upward, what is the direction of the magnetic field produced by the current? A. in the same direction as the current B. in the opposite direction to the current C. clockwise D. counterclockwise I think it is A,is that correct?
Tuesday, January 24, 2017 by Anonymous

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Homework Help: Science