# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

Your electric jug element produces 1.5kW of power. What is the minimum time it will take to heat 1.5L of water from 20 degrees Celcius to boiling

**Physics**

Your vertical spring accelerometer has a 200 g mass hanging from it. You climb aboard the roller coaster and watch the accelerometer read 0.4 g for 3 seconds while descending and read 1.5 for 2 seconds while climbing the next peak. The car weighs 2000 kg. What is your ...

**Physics**

A ball is moving to and fro about the lowest point of a smooth hemispherical bowl. If it is able to rise up to a height of 45cm on either side.it's speed at the lowest point must be?

**Physics**

In relativistic regimes, the total energy of an object with rest mass, m, speed, v, is: a); (Gama)mc^2 B);squre root of (m^2c^4 + p^2c^2)

**physics**

calculate the ratio of momentum when 1.velocity of the object is doubled 2.mass of the object is halved?

**Physics**

a) Why do you think our eyes fail to see object clearly at varous distances? b) (i) Explain how image of an object is formed in the human eye (ii) What are ciliary muscles? Explain the function of these muscles c) Discuss the similarities and differences between the lens ...

**Physics**

A 0.5kg ball dropped from a height of 2.4 m above the floor. if an impact with the floor it loses 3 joules of energy, how high will it bounce?

**Physics**

Two positive charges of 0.2microC and 0.01 microC are placed 10cm apart. Calculate the work done in reducing their distance to 5 cm

**physics/calculus**

can someone explain to me why the derivative and second derivative of this position vector r=ax+bty is r'=ax' +by'+ bty' ( why is there a by'...?) and r''=ax'' + cy' +cy' +cty'' ( why is there 2 cy' 's?

**physics**

A pin 2 cm long is placed 12 cm away from a convex lens at right angles to the principal axis. If the focal length of the lens is 20 cm, by scale drawing and lens formula find the nature , size and position of image.

**Physics 11**

A student throws a .1kg ball at a wall. The ball hits the wall perpendicularly with a speed of 5m/s & then bounces back w/ a new speed of 4m/s. What impulse is given to the ball by the wall? I used deltaP= m deltaV so deltaP= .1*(-1) to get -.1N-s. I got it wrong! Can someone ...

**Physics 11**

A 1200Kg car travels at a constant speed of 26m/s for 5s up a 130m long hill. The total height of the hill is 27m & the friction force acting on the car is 2520N. What power was used by the car in traveling up the hill? I know that Fnet=o bc velocity is constant, therefore ...

**Physics 11**

If 2 vehicles are moving toward each other from opposite directions & are the same mass & velocity then momentum=0 correct? Because p=M1V1 - M1V1 Thanks!! :)

**PHYSICS**

the radius of the planet Venus is nearly the same as that of the earth.if an object weighs We on the earth,what is valu

**Physics 11**

A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. I've already answered & gotten this question correct, however it made me confused about the concept. I found Ek. & Ek to find change in Ek which was 3479.85. He did work against...

**Physics 11**

In the absence of air resistance, a ball of mass m is tossed upward to reach a height of 20m. Given that Fg=mg, what is the net force on the ball at the 10m position (half way up)? a)2mg b)mg c)mg/4 d)mg/2 I already got this wrong bc I had no idea how to solve. I have a ...

**Physics (Mirror Rays)**

3. When an object is located very far away from a convex mirror, the image of the object is 18 cm behind the mirror. Using a ray diagram drawn to scale, determine where the image is located when the object is placed 9.0 cm in front of the mirror. Note that the mirror must be ...

**physics**

a man having a mass of 60 kg exerts a horizontal force of 200 newton in pushing a 90 kg object a distance of 60 meters along horizontal floor. he does this at constant velocity in 3 seconds.the weight of man will be?

**physics**

a ball of weight 200 grams,is tied to the end of a cord and whirled in a horizontal circle of radius 0.6 m.if the ball makes five complete revolutions in 2 seconds,what will be the linear speed of the ball?

**Physics 11**

Can someone explain what work total is? In my lessons it said Work total is the sum of all work & showed an example of different work being added together. An assignment after that however made me think that may not be the case... Do I need to add the work in some cases or is ...

**physics**

A 500 g mass of Copper at 24°C is placed in contact with another 750g of copper at 84°C. If it is isolated from it surroundings, what will be the final equilibrium temperature of the blocks.

**physics**

A 3.00-g bullet (c = 0.0305 cal/g . C° = 128 J / kg . C°) moving at 180 m/s enters a bag of sand and stops. By what amount does the temperature of the bullet change if 80% its KE becomes thermal energy that is transferred to the bullet?

**physics**

Tammy leaves the office, drives 36 km due north.Then she turns onto a second highway and continues in direction 45 degree north of east for 50 km. What is her total displacement from the office? (give magnitude and direction)

**physics**

solve this physics problem for me a vehicle has a mass of 1200kg and four wheels of area 0.06m2 calculate pressure on one wheel

**physics**

someone fires a pistol and it's bullet leaves the muzzle at t=0. The position vector of the bullet is r= ax+bty ( a and b are postive constants) what are the units of a and b so the equation to make sense what's the acceleration and velocity

**physics**

Island A is 500km east and 320km south of Island B. Island C is 75km east and 1015km north of island A. find the components of the (delta)r vector value pointing from island B to island C

**physics**

Suppose an airplane is flying in air with a speed of u=100m/s . The wind is from the south west with a velocity of v= 70m/s what direction should the airplane head in order to fly directly north ( with respect to the ground)? Give the angle in degrees of west of north what is ...

**Physics**

A particle of mass 100 gm is thrown vertically upwards with a velocity of 7 m/s. Air resistance is also acting on the particle according to the equation F = -0.2v^2. ( F = Force, v = velocity of the particle ). Find how much high the ball rises. Please answer it. Thanks in ...

**physics**

You're driving on the freeway going 90km per hour and it starts to rain. The raindrops make an angle of 40 degrees with the vertical when viewed through the driver's side window. What is the speed of the raindrops measured by someone at rest relative to the freeway? What is ...

**physics**

Consider a drop of mass 1g falling from a height 1km.what is work done by gravity?

**physics**

A 15.0 m, 500 N uniform ladder rests against a frictionless wall, making an angle of 60 0 with the horizontal, as shown in Figure Q3(a). Draw the free body diagram and calculate the normal force FN exerted by the wall, horizontal FBI and vertical Fv forces exerted on the base ...

**physics**

A car is traveling at 60 mi/h down a highway. a)What magnitude of acceleration does it need to have to come to a complete stop in a distance of 200 ft? b)What acceleration does it need to stop in 200 ft if it is traveling at 110 mi/h ?

**Physics**

in an enclosed container , 100g of ice at -10c and 200g of water at 25 c are mixed. Determine the amount of heat required to convert the mixture to steam at 110c Cice=2100J/kg.K Cwater=4186J/kg.K Csteam=2080J/kg.K And latent heats Lf ice=335000J/kg and Lv=2260000J/kg

**Math**

In an examination of a certain class, at least 70% of the students failed in Physics, at least 72% failed in Chemistry, at least 80% failed in Mathematics and at least 85% failed in English. How many at lest must have failed in all the four subjects ?

**Physics**

Two positive charges of 10micro column and 5micro column respectively are 12cm apart find the workdone in bringing them 6cm closer?

**Physics**

A lift of height 3.375m is moving with acceleration of 2.2m/s2. What is the time required by any object to fall from the roof of the lift to the floor????

**Physics**

How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/kg ∙ K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ∙ K.

**physics**

how will you find relative density of coconut oil with the help of density bottle

**Physics**

15)A small ball of mass m is aligned above a larger ball of mass M = 1.2 kg (with a slight separation, as with the baseball and basketball of Figure (a)), and the two are dropped simultaneously from height h = 2.4 m. (Assume the radius of each ball is negligible compared to h...

**Physics**

What is the weight of an object that has a base which is 3 square cm and which exerts a pressure of 21 kg per square meter?

**physics relativity**

How fast would you need to be travelling relative to an observer in order for them to see a 15% increase in your mass?

**physics relativity**

An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?

**Physics**

In the qualifying round of the 50-yd freestyle in the sectional swimming championship, Dugan got an early lead by finishing the first 25.00 yd in 10.01 seconds. Dugan finished the return leg (25.00 yd distance) in 10.22 seconds. a. Determine Dugan's average speed for the ...

**Physics**

two blocks aA and B are placed as in figure, and connected by ropes to block C. Blocks A and B weigh 20 N each and the coefficient of kinetic friction between each block and surface is .40. Block C descends with an acceleration of 2 m/s2... A. Find the tension in the ropes B. ...

**Physics**

A 5kg object placed on a friction-less, horizontal table connected to a string that passes over a pulley and then is fastened to a hanging 9kg object. (A) Draw a free body diagram of both the objects. (B) The Coefficient of kinetic friction between the object and the surface ...

**Physics**

A 263-g block is dropped onto a vertical spring with force constant k = 2.52N/cm. The block sticks to the spring, and the spring compress 11.8 cm before coming momentarily to rest. while the spring is being compressed, how much work is done: (a) By the force of gravity (b) By ...

**Physics**

A beaker of water placed on a scale produces a reading of 0.910kg. An object of mass 0.27kg and volume 9.40 x 10^-5m^3 is lowered into the water by a string. By how much will the reading on scale change?

**physics**

an air craft has a takeoff velocity of 180km/h. what length of runway is needed? the accelaration of aircraft along the runway is 2.5 m/s^2

**Maths / Physics (uni level)**

Say I have a centre of rotation at C(x, y, 1 <= z <= 1.5). I need to define a unit normal vector to this. I know it's a length of 1 and this means there's a sphere of radius 1 at the origin so I can get the beginnings of a spherical coordinate system, but I'm a little ...

**physics**

A car is moving down the road with a constant velocity of 20m/s. The car passes by a big billboard. There is a police officer ( motorcycle) at rest behind the billboard. It takes one second to start the motorcycle and start chasing the car. The motorcycle is accelerating at 2m...

**physics**

A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second. What is the velocity of the ...

**Physics!**

At a steam power plant, steam engines work in pairs, the output of heat from one being the approximate heat input of the second. The operating temperatures of the first are 520°C and 320°C, and of the second 310°C and 170°C. If the heat of combustion of coal is 2.8x107 J/...

**Physics**

A thin film of oil strongly reflects blue light. Should the oil be made thicker or thinner to reflect red light?

**Physics**

Suppose you have a pinhole camera which is 5 cm long between the hole and the film. You photograph a 1 cm long bug that is 10 cm in front of the pinhole. How long will the image of the bug be on the film?

**Physics 11**

A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. I used change in energy = work to find work against inertia which was 3479.85 Then I used V^2=V.^2 + 2ad to get ad=47.025 I then used W=mad to get work against friction, my ...

**Physics 11**

A girl pushes her little brother on his sled w/ a force of 35N for 840s. How much work does she do if the force of friction I'd 27N? I subtracted the force of friction from the applied force to get my net force of 8N but I don't know where to go from there... Thank you :)

**Physics 11**

A 90kg basketball player carries about 720J of kinetic energy when running down the court. If the coefficient of kinetic friction between good runners & the floor is .600, how far does the player skid when trying to stop? Hint: what work was done by friction in bringing the ...

**physics**

a simple pendulum has a period of 2.0s and magnitude of swing 5cm.find i-the velocity of the bob ii-the acceleration of the bob

**Physics**

A car is traveling with a kinetic energy if 2200 J. If a braking force of 1100 N is applied to the car, how far will the car travel before it stops?

**Physics**

A car is traveling with a kinetic energy if 2200 J. If a braking force of 1100 N is applied to the car, how far will the car travel before it stops?

**physics**

If 335 g of water at 65.5 °C loses 9750 J of heat, what is the final temperature of the water? Liquid water has a specific heat of 4.18 J/(g.°C). °C (Answer a number only, no units. Round to the tenth place). This is an example of an endothermic or exothermic reaction?

**physics**

if some of water in calorimeter splash out when tranfering the metal block, will it affect the experiment result?

**Physics**

A plutonium- 239 nucleus initially at rest undergoes alpha decay to produce a uranium-235 nucleus. The uranium-235 nucleus has a mass of 3.90 x 10^-25 kg and moves away with a speed of 2.62 x 10^5 m/s. Determine the minimum wage electric potential difference that is required ...

**Physics**

A plutonium- 239 nucleus initially at rest undergoes alpha decay to produce a uranium-235 nucleus. The uranium-235 nucleus has a mass of 3.90 x 10^-25 kg and moves away with a speed of 2.62 x 10^5 m/s. Determine the minimum wage electric potential difference that is required ...

**physics**

A person is running from a cliff into a pond. The cliff has a height of 10.0m above the water but it is not strictly vertical, it slopes down to the pond at an angle of 40 degrees with respect to the vertical. What is the minimum speed the person needs to jump from the cliff ...

**physics**

An object is launched at an angle of 78º above the horizontal with an initial speed of 120 m/s. Find (a) the maximum altitude reached by the object, (b) its total time of flight, and (c) its horizontal range

**physics**

a 0.5 kg ball is thrown upward with an iniatial speed of 10 m/s, what is the initial kinetic energy of the ball and the total mechanical energy assuming initial potential energy is zero.

**physics**

Calculate the tension in a vertical strand of spider web if a spider of mass 8.00Ãƒâ€”10Ã¢Ë†â€™5 kg hangs motionless on it. (b) Calculate the tension in a horizontal strand of spider web if the same spider sits motionless in the middle of it much like the ...

**Physics**

a) A 40 cm radius wheel is rotating at 20rad/sec. How fast is this wheel moving across the ground? b) How far (in meters) will this wheel move in 6 seconds?

**Physics**

a) Find the angular velocity of a wheel that rotates 6 times every 4 seconds. b) What is the tangential velocity of the outside of the wheel if the radius is 15 cm?

**Physics**

In what part of the electromagnetic spectrum does the wavelength 0.0141 nanometers belong in?

**Physics**

a) Find the angular velocity of a 40 cm radius wheel that is moving at 20 m/s. b) How many times will this wheel rotate in 5 seconds?

**Physics**

A ball is thrown horizontally from the roof of a building 45cm tall and lands 24.0m from the base. What was the ball's initial velocity?

**physics**

Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine expends the most power doing this work?

**Physics**

If a wheel revolving at 1800 r.p.m. slows down uniformly to 1200 r.p.m. in 25s, calculate the angular acceleration of the wheel and the number of revolutions it makes in this time.

**Physics**

Three equal charge Q each are place in the vertices of an equilateral triangle of side a.What is the resultant force on any one charge due to the other two?

**PHYSICS**

10N force applied at an angle of 30 degrees with the horizontal, find its horizontal component

**Physics**

A charge q is placed at h distance from the base of centre . Find the flux ?

**Physics**

A positive ion moves at a velocity of 2.4x10^5 ms in a circular path of radius 1.8m when a magnetic field of 0.315 T is applied. Find the mass of the ion. Assume a single charge.

**Physics**

Two parallel wires separated by 16 cm are carrying currents of 14 A (left) and 20A (right) in the same direction (up the page). Determine the magnetic field at position 3 cm to the right of the 20A wire. Calculate the distance where the magnetic field would be zero.

**Physics**

A particle, travelling at 5.2x10^3 ms, with a charge of 1.6uC, is moving up the page. It is at right angles to a magnetic field of 6.4 T in the direction of right. What is the magnitude and direction of the force on the particle?

**Science physics**

mandy drops a 2.0kg book from a height of 4.5m. how much work has gravity done on the book? M=2.0kg D= 4.5m Not actually sure what to do next. Because none of the formulas work. I need work but I don't even know the force. To find force I need mass which I have but I don't ...

**physics**

a tennis ball of mass 20g is released from rest at a height of 4m above the ground. on hitting the ground,it raises to a height of 3m.find the velocity with which it hits the ground.

**Physics**

If a sound has a wavelength of 3 m, what is its frequency? Use 340 m/s for its speed of sound.

**Physics**

3. Consider a freely falling object. a. What is the acceleration (in m/s2) after 5 seconds of fall? b. What is the acceleration (in m/s2) after 10 seconds of fall? c. What is the velocity (in m/s) after 5 seconds of fall? d. What is the velocity (in m/s) of 10 seconds of fall?

**Physics**

Suppose you are provided with 500 dice.calculate the number of throws that is equivalent to one half life and the decay costant for the process.under radioactivity decay analogue experiment

**Physics**

The Little Prince is a fictional character who lives on a very small planet as shown in the figure below. Suppose that the planet has a mass of 1.95 1013 kg and a radius of 1.06 103 m. (a) How long would it take for an object to fall from rest a vertical distance of 1.16 m? (b...

**physics**

Someone drops a ball from the roof of your building.The ball drop past your window. It takes time T to pass the window's height. What is the initial speed of the ball when it first came in view?

**Physics**

If you are casting a shadow of a ball on the wall, how do you make the umbra larger than the ball or is it impossible. Also, how can you make the umbra smaller than the ball or is it impossible? How can you make the radius of the penumbra larger than the balls radius? How can ...

**physics**

A object weighing 0.6netron is hung for an spiral spring and causes it to extend by 6.0cm the object is removed and a block of wood replacing it causes the spring to extermely 10.0cm what is the weight of the block of wood

**physics**

A sandal is dropped from the top of a 15.0-m-high mast on a ship moving at 1.75 m/s due south. Calculate the velocity of the sandal when it hits the deck of the ship: (a) relative to the ship and (b) relative to a stationary observer on shore. (c) Discuss how the answers give ...

**Physics**

A body is moving with uniform acceleration covers 100m in the first 10s and 150m in the next 10s. Find the initial velocity of the body.

**College Physics**

What mass can a 20000 watss engine pull at a speed of 30 m/s. If coefficient of friction is 0.15 between the mass and ground?

**Physics**

A train moving with constant speed of 54kmph moves eastwards for 30min then north for 40min find avg velocity

**Physics**

The Black Pearl has once again sailed into Port Royal and is firing its guns at the fort. The cannons atop the fort wall have been disabled, but there remains a single cannon at sea level which must defend the town. If the gunner estimates that the ship is 400 meters ...

**PHYSICS**

Why does the lower body rotate in the opposite direction when the upper body is thrown? angular momentum?

**PHYSICS**

A 5 kg block rests on a frictionless horizontal surface. A cord attached to the block passes over the pulley whose diameter is 0.120 m to the hanging block of mass 5 kg. The system is released from rest and the blocks are observed to move 3m in 2.0 s. A. What is the tension in...

**PHYSICS**

A string is wrapped around the rim of a flywheel 0.400 m in radius, and a steady pull of 50.0 N is exerted on the cord. The wheel is mounted in frictionless bearings on a horizontal shaft through it's center. The moment of inertia of the wheel is 4.00 kg.m^2 .Calculate the ...

**physics**

Determine the frequency of the note F4, 5 Seminotes above middle c (C4=261.6Hz) So would it be C4 = 261.6Hz x 1.05946^5 The fact they say semi notes is throwing me off, so I'm not sure if it's right.

**physics**

Red light with a wavelength of 7.0x10^-7 m travels at a speed of c. When it enters glass it's speed is reduced to 2.0x10^8 m/s. Calculate the wavelength of this redlight in glass. Assume that the frequency does not change. I'm really confused and I'm not sure how to do this ...