# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

A firework whose mass is 7kg is launched vertically up into the air. After it reaches its the height of 160m, it blasts and splits into two pieces; pieces A and B. The two pieces fly off and travel horizontally. The blasts of the fireworks lasts 10ms. Piece A (mass of 1.50kg...

**physics**

Suppose that a car wheel is spinning with angular velocity of wo. The car is then turned off and the wheel start to slow down because of friction and angular acceleration is constant. The wheel comes to rest after it has made X revolutions. What is the magnitude of the angular...

**physics**

Suppose that a car wheel is spinning with angular velocity of wo. The car is then turned off and the wheel start to slow down because of friction and angular acceleration is constant. The wheel comes to rest after it has made X revolutions. What is the magnitude of the angular...

**physics**

A firework whose mass is 7kg is launched vertically up into the air. After it reaches its the height of 160m, it blasts and splits into two pieces; pieces A and B. The two pieces fly off and travel horizontally. The blasts of the fireworks lasts 10ms. Piece A (mass of 1.50kg...

**physics**

Ball 1 is moving to the right at speed Vo when it collides with ball 2 - is initially at rest. After the collision, ball 1 's initial KE decreases by 80% and has a velocity at an angle of 40 degress below the horizontal. what fraction of the initial KE does ball 2 have after ...

**Physics II**

Two long straight parallel wires separated by L2 = 8.16 cm carry currents of equal magnitude but heading in opposite directions. The wires are shown perpendicular to the plane of this page. Point P is L1 = 1.96 cm from wire 1 and the magnetic field at point P is 1.22 x 10−2 ...

**Physics II**

A defibrillator passes a brief burst of current through the heart to restore normal beating. In one such defibrillator, a 47.0 μF capacitor is charged to 5.91 kV. Paddles are used to make an electrical connection to the patient's chest. A pulse of current lasting 1.00 ms ...

**PHYSICS**

A young engineer has come up with a back-up system, which is to be used in case of an engine failure. He has devised a system consisting of a pressure vessel containing helium (MHe = 4.0 g/mol) and a folded balloon. In case of an engine failure, the helium is let out of the ...

**Physics**

The greatest and least resultant of two forces acting at a point are 16N and 4N.if they are acting at an angle 120 with one another their resultant is

**Physics**

A man pulls a 300N object across a horizontal surface using a 100 N force applied at a 35 degree angle. What is the normal force? If the object is pulled at constant speed, what is the coefficient of friction?

**physics**

Consider a string with a length of 56 cm tied at both end (like on a stringed instrument). If the frequency of the first harmonic on the string is 272 Hz, determine the speed of the wave in the string. Post your answer in m/sand with 3 significant figures.

**Physics**

The ratio of maximum and minimum magnitudes of the resultant of two vectors a and b is 3:1 now |a| is equal to

**Physics**

Two things infinite sheets have uniform surface density of charge+5 and _5 .electric field in space between two sheets is

**Physics**

a soccer ball is kicked from the top of a 50ft high hill with an initial velocity of 25ft/s at angle 30 degrees below horizontal. At what velocity will it strike the ground? b. How long would it take the ball to reach the ground c. What is the range that the kicked ball will ...

**physics**

a boy runs 100m along the east,then he turns to his left side at right angle and runs for 50m along the north direction.find the distance and the magnitude of the displacement .

**physics**

a boy runs 100m along the east,then he turns to his left side at right angle and runs for 50m along the north direction.find the distance and the magnitude of the displacement .

**physics**

a plane flying due north at 100 m/s is blown by a. 50 m/s strong wind due east. b. what is the plane's resultant velocity?

**PHYSICS**

Suppose that the lift-drag polar of the previous problem belongs to a 32,000 kilogram aircraft with an average wing chord of 3.5 meters and a wingspan of 30 meters. At a certain moment this aircraft flies in cruise at a speed of 300 ft/s, with an air density of 1.0 kilogram ...

**PHYSICS**

The hydrostatic equation holds not just for air, but for other fluids such as water (air, though it is a gas, is often referred to as a 'fluid') as well. In the case of water the equation becomes even easier, as water (as opposed to air) can be treated as incompressible, ...

**PHYSICS**

Suppose we launch a scientific rocket straight up from sea level (at standard conditions) with a pressure measuring device attached to it. Given that in the first 12 seconds the rocket experiences a 25% decrease in air pressure, what is the average speed (rate of climb) of the...

**Physics**

Explain the all three laws of motion

**physics**

Two moles of Helium gas (γ = 5/3) are initially at temperature 27 degree Celcius and occupy a volume of 20 litres. The gas is first expanded at constant pressure until the volume is doubled. Then it undergoes an adiabatic change until the temperature returns to its initial ...

**engineering physics**

A hot air ballon is ascending at 12m/s and at 80 m above the ground, a package is dropped over teh sdie. How long does it take the package to hit the ground?

**Physics**

What is the final temperature when 8.1 x 105 J are added to 1.50 kg of ice at 0.0 Â°C?

**Physics**

an object of mass m is being weighed in an elevator that is moving upward with an acceleration a. What is the eesult if the weighing is done using a spring balance and a pan balance?

**physics**

A car is travelling at 20 m/s along a road A child runs out into the road 50 m ahead and the driver steps on the break pedal What must be the cars deceleration be if the car stops just before it reaches the chid

**Physics**

A football is kicked from the ground at an initial angle of 35.0° and an unknown initial speed. A 3.05 m tall goal post is 45.0 m away. With what minimum speed should it be kicked to hit the horizontal crossbar of the goal post?

**physics**

if i take a fluid in a container open to the atmosphere and raise its height what happens to the hydrostatic pressure? I thought it would decrease because pressure decreases with altitude but the answer says that it would increase. I just assumed it would be the opposite of ...

**Physics**

A 3 kg block travels along a horizontal surface with a coefficient of kinetic friction of 0.26 at a speed of 7 m/s. After sliding a distance of 1.0 m the block makes a smooth transition to a ramp with a coefficient of kinetic friction of 0.26. How far up the ramp does the ...

**Physics**

A boat, which can travel 2.30m/s in still water is in a stream with a current moving at 1.20m/s. if the boat is pointed directly across the stream, determine the velocity of the boat relative to the shore?

**Physics**

An 8 kg block is shot up an incline of 300with an initial speed of 2.8 m/s. How far up the incline will the block travel if the coefficient of friction between it and the incline is 0.18? Hint: Express the height above the ground that the block is above the incline in ...

**physics**

A negative point charge, q, is placed near a positive charge, Q. The distance between the charges increases as q is moved farther from Q. Which quantity will decrease as q is moved away? electric potential energy electric potential electric potential difference electric charge

**physics**

two horizontal parralel plate each of area 100cm2, 1m apart in vaccum the lower part is earthed and upper part is given a charge of 0.5uc neglect edge effect , find the electric field between the plate

**physics**

A hammer weighing of 1 kg moving with the speed of 10 m/s strikes the head of the nail driving it 10 cm into wall. Neglecting the mass of the nail, calculate the impluse.

**physics**

How many electrons pass through a wire in 5 minutes, if the current through a wire is 400 mA

**Physics, Calculus**

if an aircraft flying at 250km/h at bearing N 45East for 1 hour meets a wind from the NW at 50km/h, then how long will it take to fly the full 550km maintaining its N45E bearing to the ground with this wind blowing?

**College physics**

Gun sights are adjusted to aim high to compensate for the effect of gravity, effectively making the gun accurate only for a specific range. (a) If a gun is sighted to hit targets that are at the same height as the gun and 100.0 m away, how low will the bullet hit if aimed ...

**physics**

A hammer weighing of 1 kg moving with the speed of 10 m/s strikes the head of the nail driving it 10 cm into wall. Neglecting the mass of the nail, calculate: 1) The acceleration during the impact 2) The time interval during the impact 3) The impulse (force X time)

**College PHYsics**

Felix Baumgartner, an Austrian skydiver, jumped from a balloon at an altitude of 38,963.3 meters, and fell into history. He was in free fall for 4 minutes 19 seconds, and on the way down reached the speed of 1,357.64 km/h What if there had been no air? How long would it have ...

**Physics**

A block of mass 2 kg attached to a spring lies on a flat surface. When the block is pulled 5 cm to the right a force with a magnitude of 300 N is need to hold it in place. What is the work done by the spring when the block moves from x = 10 cm to x = 12 cm. Express...

**Physics**

A uniform rod of weight 300N and 2m long is hinged to the floor at one end so that it can rotate in the vertical plane. The other end of the rod is tied to a point on the ceiling vertically above the floor hinge by means of a rope 2.5m long. The vertical height if the ceiling ...

**physics**

if the velocity of wave is 0.15m/s and the frequency is 20Hz, what is the wavelength?

**College Physics**

1. A construction worker tosses a hammer straight up to a co-worker who is working on a platform above him. The hammer leaves his hand at 7.26 m/sec, and travels 3.33 meters upward, at which point it is caught by the worker on the platform. (It is caught while still moving ...

**Physics**

A car going 15 m/s is brought to rest in a distance of 3 m as it strikes a pile of dirt. How large a force is exerted by the seatbelts on a 90 kg passenger as the car is stopped?

**AEJC , physics**

a flywheel of mass 200 kg is rotating at the rate of 8 rps . find the constant torque required to stop the disc in 11 rotations.

**Physics**

A construction worker tosses a hammer straight up to a co-worker who is working on a platform above him. The hammer leaves his hand at 7.26 m/sec, and travels 3.33 meters upward, at which point it is caught by the worker on the platform. (It is caught while still moving upward...

**physics**

if a body moves 3m north,then 4m East and finally 6m South.what will be the displacement?

**Physics**

A hot-air balloon ascends at the rate of 12m/s when it is 80m above the ground at which time a package is dropped over the side . (a) how long would the package take to reach the ground ? (b) with what speed would it hit the ground?

**physics**

an object of mass 2 kg attached to wire length 5 cm is revolved in a horizontal circle if it makes 60rpm find angular speed

**Science (physics)**

A powerful motorcycle can accelerate from rest to 28 metre per second in only 4 seconds what is the average acceleration? How far does it travel in that time

**Physics 2**

What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?

**Physics 2**

How many grams of steam at 100C must be mixed with 200g of water at 20C in order for the equilibrium temperature to be 50C?

**Physics**

Find the refractive index of a transparent medium in which light travels with a speed of 1.8×10^8m/s.Given that speed of light in vaccum is 3×10^8m/s?

**physics**

A beam of 8.3 Mev alpha particles is directed at an aluminum foil. it is found that the Rutherford scattering formula cease to be obeyed at scattering angles exceedin about 60 .if alpha particle is assumed to have a radius 2*10^-15m. find the radius of the aluminum nucleus

**physics**

A block of mass 0.8kg is dragged along a level surface at constant velocity by hahanging block of mass 0.2kg

**Physics**

A bullet moving at 20 m/sec strikes a wooden plank and penetrates 4cm before coming to stop the time taken to stop is

**Physics**

The driver in a car of total mass 800kg and which is travelling at 20m / s suddenly observes a stationary dog in his path 50m ahead . if the car brakes can exert a force of 2000N, what will likely happen

**Physics**

A body is projected vertically up with a velocity 98m/s after 2sec if the acceleration disappears the velocity of the body at the end of 3sec??

**physics physics**

Physics Question Two toy ducks, attached to each other by a string, are being pulled by a very happy guy who just got them as a graduation present (Fig. 4.31). The front duck is 5.0 kg and the back duck is 2.0 kg. If the happy guy pulls them with a force of 10 N and there is ...

**Physics**

A record player rotates a record at 45 revolutions per minute. When the record player is switched off, it makes 5 complete turns at a constant angular acceleration before coming to rest. What was the magnitude of the angular acceleration (in rads/s2) of the record as it slowed...

**Physics**

This is about em spectrum? What are the effects of differences in the velocities of electromagnetic waves in different substances... long !@#$%^& question

**Physics**

Two capacitors A and B having capcitance 2micro farad and 6 micro farad are charged separately to same potential of 120 volt.Now pisitive plate of A is connected to negative plate of B and negative plate of A is connected to positve plate of B. Find final charge on each ...

**Physics 11**

Devon speeds past Tamara in his space shuttle. In Tamara's frame of reference, the shuttle moves with a speed of 0.88c. Devon's radio is blaring out music with a beat that occurs every 0.50 seconds. How often does Tamara hear the beats? I'm getting 0.24 s but it's saying that'...

**physics**

If A=4i+3j-2k, B=8i+6j-4k then the angle would be?

**Physics**

A stone is tossed upward at the moment a ball is dropped from a height of 25 meters. The stone's initial velocity is 25 m/s. At what height will the two meet?

**physics**

Ant climb up 5 stairs, each of length 20 cm and height 20 cm . Find the distance covered and displacement covered by ant ?

**physics**

Ant climb up 5 stairs, each of length 20 cm and height 20 cm . Find the distance covered and displacement covered by ant ?

**physics**

And and climb up 5 stairs , each of width 20 cm and height 20 cm . Find the distance covered and displacement of ant ?

**physics**

An ant climbs up 5 stairs, each of width 20 cm and height 20 cm . Find the distance covered and displacement of ant ?

**physics**

A body is thrown up with the velocity of 20 metre per second . It retards uniformly at the rate of 10 metre per second square. Find the velocity after 2 seconds?

**Physics**

The radius of the planet venus is nearly the same of that of the eart but it's mass is only 80% that of the earth. If an object weighs We on the earth (a) what does it weigh on venus (b) calculate the value of g in venus

**Physics 1**

A sprinkler mounted on the ground sends out a jet of water at a 35 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 10 m/s. How far does the water travel before it hits the ground? This is my work: d=(10)sin2(35)/9.81 but I do not know how to put the 2 in...

**Physics**

Suppose the sprinter continues to run at 6m/s until the end pf the race. After crossing the finish line the sprinter decelerates at 2m/s^2.a) how long it takes her to stop b) how far does the sprinter travel while stopping?

**physics**

two runners are competing in a 400-meter dash. The first runs at 6m/s and maintains this speed. The second runner starts at 10m/s and decelerates at 1.8m/s^2. Who will finish first? What will be their time difference?

**Physics 2**

What is the approximate mass of air in a living room 5.6 m x 3.6 m x 2.4 m?

**Physics**

A plane intends to north with a speed of 250 m/s relative to the ground through a high altitude cross wind of 50 m/s coming from the east. Determine the bearing that the plane should take( relative to due north), A) the planes speed with respect to the air answer

**Physics**

A glow stick is placed 18.0 cm from a converging lens that has a focal length of 8.0 cm. Determine the location of the image using both a ray diagram & the lens equation. So I'm not sure if my diagram is perfectly accurate, they just said "at least 4 squares high" but it is ...

**Physics**

A car travels at a speed of 70km/h. What distance will it cover in 30 minutes

**Physics**

A car travels at a speed of 70km/h. What distance will it cover in 30 minutes

**physics**

Good chocolate is designed to melt at 34°C. A chocolate bar, originally frozen to a temp of -115°C, has its thermal energy doubled. Will it melt? It's not like temperature, so if thermal energy is doubled that means heat is being added & therefore likely it will melt right? ...

**Physics**

Brownian motion

**Physics**

A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.7 m/s2 when a horizontal force F= 350 N is applied. Assuming there is no friction between the bottom 100 kg block and the horizontal frictionless surface but there is friction ...

**Physics 11**

A rose is placed 15.0 cm in front of a convex mirror of focal length 10.0 cm. I assume f= -10cm bc it's convex correct? giving me (1/-10)-(1/15)=(1/di)? Thank you

**Physics**

A ball is allowed to fall from the top of the tower 200m high. At the same instant another ball is thrown vertically upwards from the bottom of the tower with velocity of 40m/s. When and where the two balls meet?

**Physics 11**

Confused about the formula (1/-f)= (1/do)+(1/-di) For locating an image for a convex mirror. A rose is placed 15cm in front of a convex mirror of focal length 10cm. Determine the location of the image using the mirror equation. (1/-10)=(1/15)+(1/-di) -0.1=0.067 + (1/-di) -0....

**physics**

the linear expansively of the material of a cube is 12*10-6k. if the length of each side of the cube is 10cm,find the area of one face of the cube and the volume of the cube when its temperature is raised by 30k

**Physics**

Pls what are evanescent waves really

**physics**

A 72 N force accelerates mass m1 by 5.0 m/s^2. The same force acts on another mass m2. What acceleration will the same force impart to the two masses when they are joined together?

**Physics**

Two speakers send out sound in phase at a frequency of 779 Hz. When you are the same distance from both speakers you hear a maximum sound. Moving around, you hear essentially no sound when you are 65 cm from one and 85 cm from the other, and again when you are 123 cm from one ...

**Physics**

Two speakers send out sound in phase at a frequency of 779 Hz. When you are the same distance from both speakers you hear a maximum sound. Moving around, you hear essentially no sound when you are 65 cm from one and 85 cm from the other, and again when you are 123 cm from one ...

**Physics**

Two instances during which the heating effects of electric current is not required pls

**Physics**

When a butterfly lands 12 cm from a concave mirror, it's image is 18 cm behind the mirror. Find the focal length 1/f=(1/do)-(1/di) 1/f=(1/12)-(1/18) 1/f=0.0833-0.0555 1/f=0.0277 f=36 I'm pretty confident w/ my math but as I understood, it's do-di if it's behind the mirror, ...

**Physics 11**

Glycerine has an index of refraction of 1.47. What is the critical angle for a light ray traveling from: a)Glycerin into air b)Glycerin into water a) I know- n1=1.47 n2=1 angle of refraction=90 1.47(sin.anglei)= sin90 1.47(sin.anglei)=1 sin.anglei=0.6803 angle of incidence=42....

**Physics 11-Ray Diagrams**

I'm doing a ray diagram with an arrow leaning away from a plane mirror. The rays leading from the tip of the arrow to the image on the other side of the mirror lined up perfectly, however for the rays leading from the end of the arrow I can't seem to line it all up so that ...

**physics-density**

A solid right circular cone of uniform mass density is initially at rest above a body of water, so that its vertex is just touching the water's surface with its axis of symmetry along the vertical. Now, the cone falls into the water, and has zero speed at the instant it ...

**Physics**

Robin Hood is known for stealing from the rich to give to the poor. He finds himself surrounded by some angry noblemen who demand he return their gold chest. Outnumbered, he takes an arrow from his quiver and fires it straight into the air, scattering the noblemen who are ...

**physics**

One second after being thrown straight down an object is falling with a speed of 20m/s. How fast will it be falling 2 seconds later

**physics**

with what minimum acc can a fireman slide down a rope whose breaking strenght is two third of his weight ?

**Physics**

2 charges of 16 microculomb and 25 microculomb are separated by a distance of 2 metre apart.If another charge of 5 microculomb is placed in the middle of the line joining the 2 charges.Then what is the net force on the 5 coloumb charge

**Physics**

A water balloon is thrown straight down at 10.0 m/s from a second floor window, 5.00 m above ground level. 1) How fast is the balloon moving when it hits the ground? (Express your answer to three significant figures.)