# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics II**

the velocity of water in a 4 cm diameter pipe is 2.0m/s.what is the velocity in a 2cm diameter pipe which connects with it,both pipes flowing full?

**Math, physics, chemistry**

calculate total ionic strength of solution in which concentration of CuSO4 and Al2(SO4)3 is 0.1 molar

**physics**

A screen is placed 50cm away from a slit lit by a monochromatic light of wavelength 690nm. The distance seperating the first dark fringe and the third dark fringe in the diffraction pattern is 3mm. Calculate the width of the slit.

**physics**

A monochromatic light of wavelength 587.5nm illuminates a slit of width 0.75mm. At what distance from the slit should a screen be placed so that the first dark fringe is at 0.85mm from the center of the diffraction pattern?

**PHYSICS**

A person was reported to have fallen 45.0 m from a balcony of an apartment building onto a ventilator box, crushing it to a depth of 4.10 m (Fortunately, the person walked away with only minor injuries). What was the magnitude of the acceleration of the person during the time ...

**physics**

a body of mass 2 kg moving with a speed of 10 m/s find its momentum

**Physics**

A baseball is thrown at 40 m/s. Jose Bautista hit it back in the opposite direction at a speed of 65 m/s. The ball is in contact for 1.2 ms. What distance does the ball travel while it is in contact with the bat?

**physics**

A water balloon is launched at a speed of 42 m/s and an angle of 36 degrees above the horizontal. The water balloon hits a tall building located 27 m from the launch pad. At what height above the ground level will the water balloon hit the building? Calculate the answer in ...

**Physics**

Determine the mass of 0.5m^3 of aluminum with relative density of 2.70.

**physics**

a brick is thrown upward from the top of a building at an angle of 25 degrees to the horizontal and with an initial speed of 15 m/s. what is the velocity of the brick at the max height? (the answer is 13.6 but I don't understand why or how to do it) (i thought it would be 0m/s)

**Physics**

A car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.76 m/s2 for t1 = 20 s. At that point the driver notices a tree limb that has fallen on the road and brakes hard for t2 = 5 s with a constant acceleration of a2 = -5.93 m/s2. Write an ...

**Physics**

A cylindrical conductor of length l and unifrom area of across section A has resistance R another conductor of length 2l and resistance R of the same material has area of across section

**physics**

A ball is thrown horizontally of a cliff. If the initial speed of the ball is 24.0 m/s and the cliff is 124.0 m high, how far from the base of the cliff will the ball land in the water below? Calculate the answer in meters (m) and rounded to three significant figures.

**physics**

Show beta cubic=2alpha and galma cubic =3alpha

**Physics**

If Upper B Overscript right-arrow EndScripts is added to Upper C Overscript right-arrow EndScripts equals 7.1 i Overscript ̂ EndScripts plus 3.1 j Overscript ̂ EndScripts, the result is a vector in the positive direction of the y axis, with a magnitude equal to that of Upper...

**Physics**

Two blocks,each of mass 3.0 kg are connected by a light cord and placed on a horizontal surfabe when a horizontal force of 20 newton is applied on a block an accn of 0.50 metre per second square is produced find(a)tensiom(b)force of friction which is same

**physics**

a truck of mass 5000kg is used to tow a jeep of mass 2500kg, the truck moves with a speed of 3.0ms(power -1) just before the towing rope becomes taut,calculate the speed of the truck just before the towing rope became taut,loss of kinetic energy of the system just after the ...

**physics**

a body British moving with a velocity of 20ms(power -1) collides with another body A, moving in the same direction on the same horizontal line with a velocity of 10ms (power -1).if the mass of the body A is three times the mass of body B, and the collision is perfectly elastic...

**Physics**

A positive charge magnitude q1=35.5 nc is located at origin. A negative charge q2= -4.5 nc is located on positive x axis at p= 16cm from origin. Calculate the location on the x axis in cm where electric field is zero. So far I know we set the eqns equal to each other K*q1/(x^2...

**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 ...

**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

**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

**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?

**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..

**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.

**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 ...

**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 ...

**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...

**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

**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 ...

**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?

**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....

**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 ...

**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.

**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...

**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)

**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]

**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...

**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 ...

**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 ...

**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...

**Physics**

How much force does it take to push an 80 lb. steel cart on wheels?

**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 ...

**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?

**Physics**

for an egg drop project, does putting straws at the bottom of an egg protect it from crashing?

**physics**

An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range

**Physics**

determine the magnitude and direction of the net force acting on q0 where q0=1uC ,q1=-1uC,q2=2uC and q3=-4

**Physics**

state the finctions of double wall,silver wall and cork sttoper -

**physics**

Uranium 235 has 92 protons in its atoms. Calculate the number of neutrons in this atom

**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?

**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...

**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 ...

**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?

**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 ...

**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 ...

**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 ...

**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 ...

**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...

**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 ...

**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 ...

**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:

**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?

**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 ...

**Physics**

Half life of radium is 44 years.The sample will reduce to 50% of its orignal value after how many years?

**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.

**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?

**Physics**

A body is dropped from rest from a height of 8m. How long does it take to reach the ground?

**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 ...

**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 ...

**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, ...

**Physics**

Im doing an egg car crash project, is there any tips and tricks to protect your egg in a made car?

**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

**physics**

Whn sand is poured on a rotatory disc what happens to its angular velocity. Explain

**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?

**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...

**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 ...

**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

**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

**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.

**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 ...

**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 ...

**Physics**

What is the difference between acceleration, speed and velocity?

**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 ...

**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 ...

**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 ...

**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?

**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 ...

**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?

**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?

**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.

**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.

**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.

**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?

**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)

**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?

**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 ...

**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 ...

**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?

**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?

**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