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February 14, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A torque of 32Nm is applied to a wheel, which causes it to accelerate at 25 rad/s2. What is the rotational moment of inertia of the wheel? I got 1.28kg/m^2.
Friday, August 7, 2015 by Yoyo

Physics
A cricket ball rotates at 1800 rev/min as it travels through the space in a straight line at 160 km/hr. How many times does it revolve after traveling 20m? Can someone confirm with me if 13.5 revolutions in 20m is right. That's the answer i got too. If it's wrong can ...
Friday, August 7, 2015 by Yoyo

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +3.9 m/s and ax = +1.2 m/s2. The y components of the puck's initial velocity and acceleration are ...
Friday, August 7, 2015 by sarah

Physics
A 100 kg load is lowered by means of a cable with a downward acceleration of 5.0 m/s^2. What is the tension in the cable?
Friday, August 7, 2015 by Godwin

physics
Suppose a car is traveling at +15.0 m/s, and the driver sees a traffic light turn red. After 0.405 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 6.00 m/s2. What is the stopping distance of the car, as measured from the point where...
Friday, August 7, 2015 by sarah

physics
How many grams of Al2O3 are formed from 15L of O2 at 97.5kPa and at 21degree celcius.
Friday, August 7, 2015 by Alice

physics
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s? (b) How far does the skier travel in this time?
Friday, August 7, 2015 by sarah

physics
A gas at 250K and 15atm has a molar volume smaller than calculated from perfect gas law Calculate: a) the compression factor under these conditions b) the molar volume of gas
Friday, August 7, 2015 by Alice

Physics
a 50 g marble is released from a height 1 m above the floor. Calculate its momentum just before hitting the ground
Friday, August 7, 2015 by Anonymous

physics
A 1000 kg car can accelerate from rest to a speed of 25 m/s in 10 s. What average power must the engine of car produce in order to cause this acceleration? Neglect friction losses
Friday, August 7, 2015 by Muqadas

Physics
A block is given an initial velocity of 5.00 m/s up a frictionless 20degree incline. How far up the incline does the block slide before coming to rest?
Thursday, August 6, 2015 by Godwin

Physics
A tugboat exacts a constant force of 5 000N on a ship moving at constant speed through a harbor. How much work does the tugboat do on the ship in a distance of 3.00 km?
Thursday, August 6, 2015 by Godwin

Physics
Monochromatic light of wavelength, λ is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in maximum ...
Thursday, August 6, 2015 by Julie

Physics
A ship travels 100 km due north on the first day of a voyage, 60 km north-east on the second day, and 120 km due east on the third day. Find the resultant displacement.
Thursday, August 6, 2015 by Godwin

physics
Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 44.7 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...
Thursday, August 6, 2015 by sarah

physics
A car is traveling at a constant speed of 25.5 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two...
Thursday, August 6, 2015 by sarah

physics
A bicycle is rolling down a circular portion of a path; this portion of the path has a radius of 8.73 m. As the drawing illustrates, the angular displacement of the bicycle is θ = 0.979 rad. What is the angle (in radians) through which each bicycle wheel (radius = 0.320 m...
Wednesday, August 5, 2015 by paul

physics
Q: A block A of mass 0.5 kg can slide on a frictionless incline of angle 30o and length 0.8 m kept inside an elevator going up with uniform velocity 2m/s. Find the time taken by the block to slide down the length of the incline if it is released from the top of the incline. ...
Wednesday, August 5, 2015 by mohit

college. physics and chemistry and mathematics
An element crystalline in face centred cubic lattice. CCalculate the length of the side of the unit cell if the radius of atom is200pm
Wednesday, August 5, 2015 by nerswn narzary

Physics
A particle with a mass of 0.660 kg is attached to a horizontal spring with a force constant of 23.76 N/m. At the moment t = 0, the particle has its maximum speed of 15 m/s and is moving to the left. (Assume that the positive direction is to the right.) (a) Determine the ...
Wednesday, August 5, 2015 by Mark

Physics
The position of a particle is given by the expression x = 2.00 cos (6.00πt + π), where x is in meters and t is in seconds. (a) Determine the frequency. ______Hz (b) Determine period of the motion. ______s (c) Determine the amplitude of the motion. ______m (d) ...
Wednesday, August 5, 2015 by Mark

Physics
A fully loaded elevator weighing 2000 lbs accelerates upward from rest, attaining its rated velocity of 20 fps upon reaching a height of 25 ft. Solve for the tension on the cable lifting the elevator. What is the minimum required power of the lifting motor if 10% is allowed ...
Wednesday, August 5, 2015 by Aries

Physics
Calulate the acceleration of a 300,000kg jet on take when the thrust is equal to 120,000N. I used a = f/m to get 0.4m/s/s Tricky part. How long a runway is required for the plane to take off at a speed of 300km/h? Help?
Wednesday, August 5, 2015 by Roland

physics
A coil takes a current of 10.0 A and dissipates 1410 W when connected to a 230 V, 50 Hz sinusoidal supply. When another coil is connected in parallel with it, the total current taken from the supply is 20.0 A at a power factor of 0.866. Determine the current and the overall ...
Tuesday, August 4, 2015 by lolo

Physics
Calculate the angular momentum of a 1.75 kg ball rotating on the end of a thin string in a circle of radius 3.5 and an angular speed of 11 rad /s. Treat the ball as a point.
Tuesday, August 4, 2015 by Anonymous

Physics
A 1.00 kg glider attached to a spring with a spring constant of 40 N/m oscillates on a horizontal, frictionless air track. At t = 0 the glider is released from rest at x = -17 cm. Find the maximum value of the velocity in m/s.
Tuesday, August 4, 2015 by Anonymous

Physics
Two planets of mass 7 x 10^25 kg are release from rest 2.5 x 10^12 m apart. What is the speed of the planets when they are half this distance apart?
Tuesday, August 4, 2015 by Anonymous

Physics
A small fly of mass 0.25 g is caught in a spider’s web. The web vibrates predominately with a frequency of 5 Hz. Find the value of the spring constant.
Tuesday, August 4, 2015 by Anonymous

Physics
A 1.00 kg glider attached to a spring with a spring constant of 40 N/m oscillates on a horizontal, frictionless air track. At t = 0 the glider is released from rest at x = -17 cm. Find the maximum value of the velocity in m/s.
Tuesday, August 4, 2015 by Anonymous

Physics
Two planets of mass 7 x 10^25kg are released from rest 2.5 x 10^12 m apart. What is the speed of the planets when they are half this distance apart?
Tuesday, August 4, 2015 by Anonymous

Physics
A 4.2 m diameter merry go round is rotating freely with an angular velocity of 0.8 rad/s. If its total moment of inertia is 1760 kg*m2, find the angular velocity of the merry go round when four people of 72 kg jump onto the edge of the merry go round. Treat the persons as ...
Tuesday, August 4, 2015 by Anonymous

Physics
A sanding disk with rotational inertia 0.0012 kg-m2 is attached to an electric drill whose motor delivers a torque of magnitude 13 N-m about the central axis of the disk. About that axis and with a torque applied for 39 millisecond, what is the magnitude of the angular momentum?
Tuesday, August 4, 2015 by Anonymous

Physics
A figure skater can increase her spin rotation rate from 26 rpm to 165 rpm. Given that her initial moment of inertia is 4.6 kg - m2, find her final moment of inertia.
Tuesday, August 4, 2015 by Anonymous

Physics
In what position will a converging lens of local length 10 cm from an image of luminous object on a screen located 50 cm from the object.
Tuesday, August 4, 2015 by Rose

Physics
A light Ray is incident at an angle of 45 degrees on one side of a glass plate of index of refraction 1.6. Find the angle at which the ray emerges from the other side of the plate
Tuesday, August 4, 2015 by Gela

physics
A projectile is fired from a cliff 300 m high with an initial velocity of 400 m/s. If the firing angle is 30 degrees from the horizontal, compute the horizontal range of the projectile.
Monday, August 3, 2015 by Gela

physics
In Example 5.8 in the text book, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0 kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.80 s. It travels with ...
Monday, August 3, 2015 by sacrevman

Physics
A convex mirror (f1 = −6.30 cm) and a concave mirror (f2 = 9.50 cm) are facing each other and are separated by a distance of 24.0 cm. An object is placed between the mirrors and is 12 cm from each mirror. Consider the light from the object that reflects first from the ...
Monday, August 3, 2015 by Ali

Physics
A lighted candle is placed 38 cm in front of a diverging lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens. The final image is real, inverted, and 19 cm beyond the converging lens. Find the ...
Monday, August 3, 2015 by Ali

physics
In a gas two waves of length 1m and 1.10m have a frequency difference of 10/3 Hz, the velocity of sound is ? a) 166m/s b) 332m/s c) 83m/s d) 336.7m/s
Monday, August 3, 2015 by Muqadas

Physics
charges of -6nC and 4nC are 3m apart.(a)Determine the force they exert on each other.(b) the net electric field intensity at a point midway between them.
Monday, August 3, 2015 by TechyBoy

Physics
Force of 2.25N is acting on charge 15x10^-4C at any point. Find the Electric Field Intensity at that point.
Monday, August 3, 2015 by Clifford

physics
a stone projected horizontally from the top of a tower with a speed of 4m/s lands on the level ground at a horizontal distance 25m from the foot of the tower. calculate the height[g=10m/s2]. is it u squared divided by 2g
Monday, August 3, 2015 by Emmanuel

physics
I need to figure out how to calculate the speed time and acceleration for a jetpack to lift a 75kg man from ground. I am not sure what equations I need to use. I realize that gravity has to come in to play but other than that I am lost.
Sunday, August 2, 2015 by jimmy

Physics
A golfer hits a shot to a green that is elevated 2.90 m above the point where the ball is struck. The ball leaves the club at a speed of 19.1 m/s at an angle of 30.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
Sunday, August 2, 2015 by Cassie

Physics
A bullet of mass 10 g hits a target and penetrated 2 cm in to it if the average resistance offered by target is 100 N then the velocity with which the bullet hits the target is ?
Sunday, August 2, 2015 by Tamanna

Physics kinematics
The break of a car can slow it down from 60 miles per hour to 40 miles per hour in two secs how long it bring the car to a stop from an initial velocity of 25 miles per hour at the same acceleration
Sunday, August 2, 2015 by Ggg

physics
Find the partial pressure of nitrogen gas in the equatjon at one atmosphere atm Nitrogen+Oxygen gives Niticoxide
Sunday, August 2, 2015 by Anonymous

physics
Find the partial pressure of nitrogen gas in the equatjon Nitrogen+Oxygen gives Niticoxide
Sunday, August 2, 2015 by Anonymous

Physics
Consider the figure above, where a rigid beam of negligible mass and 10 m long is supported by a cable attached to a spring. When NO block is hung from the beam, the length L (cable-spring) is equal to 5 m. Assume that immediately after block (weight of 280 N) is hung at the ...
Saturday, August 1, 2015 by Anonymous

physics
a fan rotates speed of 600rev per min the power is cut it stopped after 60 rev find time
Saturday, August 1, 2015 by mohit

Physics
Consider the figure above consisting of three particles of mass m attached to a massless rod. Given an axis of rotation through point P, the rod rotates as shown in the figure. If the rod is released from rest in the horizontal position at t = 0. What is the angular ...
Saturday, August 1, 2015 by Anonymous

Physics
A small 700 g ball on the end of a thin, light rod is rotated in a horizontal circle of radius 1.5 m. Calculate the torque needed to keep the ball rotating at a constant angular speed if the air resistance experienced by the ball is 0.1200 N. Ignore the rods moment of inertia ...
Saturday, August 1, 2015 by Anonymous

Physics
A gymnast with a mass of 54 kg stands on the end of a uniform balance beam as shown in the figure. The beam is 5.00 m long and has a mass of 250 kg. Each support is 0.54m from the end of the beam. What is the force on the beam due to support 2? 0 ---------------------- I1 I2 0...
Saturday, August 1, 2015 by Anonymous

Physics
A softball player swings a bat, accelerating it from rest to 8 rev/s in a time of 0.3 s. Find the torque the player applies to one end of the bat. Approximate the bat as a 2.2 kg uniform rod of length 0.95 m.
Saturday, August 1, 2015 by Anonymous

physics
If a staircase has five steps each 1.45m high and 1.5m wide. A ball is placed on the top of the staircase what maximum (horizontal) velocity be given to the ball so that it directly hits the lowest plane?
Saturday, August 1, 2015 by sunny

physics(kinematics)
A police officer in a patrol car parked in a 70 Km/h speed zone observes a passing automobile might be intoxicated,the officer starts his car,accelerates uniformly to 90 Km/h in 8s ,and maintaining a constant velocity of 90 Km/h,overtakes the motorist 42s after the automobile ...
Friday, July 31, 2015 by benjamin

physics
Q:the lion chasing the monkey at speed of 5m/s and speed of monkey is 3 m/s the distance b/w them is 25m after how much distance it catches the monkey?
Friday, July 31, 2015 by unknown

physics
how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius
Friday, July 31, 2015 by rosel

Life orentation,maths,physics,business,geography
Explain three ways in wich you can help to adress poverty and aids in s.a
Thursday, July 30, 2015 by Nokuthaba

physics
A stone thrown vertically upwards from the top of a building takes 3s to reach its maximum height . Find 1. The velocity with which it is thrown 2.the maximum height it reaches above the builibg
Thursday, July 30, 2015 by Anonymous

physics
100 = mgh 100 = 10(9.81)h H = 1.02m
Thursday, July 30, 2015 by Ain

Physics
A constant force of friction of 50 N is acting on a body of mass 200kg moving initially with a speed of 15m/s. How long does the body take to stop? What distance will it cover before coming to rest?
Thursday, July 30, 2015 by Anna

physics
Thank you Henry for helping me with my physics problem about the angle etc and the golf ball on 7/28.
Wednesday, July 29, 2015 by Doug

physics
two charges, -16uC and +4uC, are separated by three meters. a) Where along the line through the charges is the electric field zero? b) What is the force on a 14uC charge place there? uC = microCoulombs for a), would it be 16+ -4? Thank you!
Wednesday, July 29, 2015 by Lola

physics
A meter stick is found to balance at the 47.3cm mark when placed on a fulcrum. When a 45.7g mass is attached at the 10.5cm mark, the fulcrum must be moved to the 38.5cm mark for balance. What is the mass of the meter stick?
Wednesday, July 29, 2015 by Mishaal

physics
A 100 kg trunk loaded with old books is to be slid across a floor by a young woman who exerts a force 300 N down and forward at 30° with the horizontal. If µs = 0.5 and µk = 0.5, compute the resulting acceleration.
Wednesday, July 29, 2015 by nwra

Physics
A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.5 m and mass 780 kg, find the torque required to produce that acceleration. Neglect the ...
Tuesday, July 28, 2015 by Anonymous

Physics
A potter is shaping a bowl on a a potter’s wheel. The wheel rotaes at a constant angular speed. The frictional force between her hands and the clay is 1.25 N. How large is the torque she produces on the wheel if the diameter of the bowl is 13 cm.
Tuesday, July 28, 2015 by Anonymous

Physics
Fred Flintstone’s club–ax is made up of two parts: an uniform 3.0 kg stick and a symmetrical 10 kg stone attached to the end of the stick. The dimensions of the club-ax are shown in the figure. How far is the center of mass from the handle end of the club-ax? Express...
Tuesday, July 28, 2015 by Anonymous

Physics
A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
Tuesday, July 28, 2015 by Anonymous

physics
A particles of mass 10-2kg is fixed at the tip of a fan blade which rotates at an angular velocity of 100rad-1.if the radius of the blade is 0.2m,then what is the centripetal force?
Tuesday, July 28, 2015 by anthony

physics
a golf ball is observed to hit the ground 800 ft. away after a flight of 5 seconds. Assume that the ground is level and neglect friction of the air. Find the angle of elevation above the ground of the initial motion of the ball, find the initial velocity of the ball, find its ...
Tuesday, July 28, 2015 by Doug

physics
A stone is thrown horizontally outward from the top of a bridge, the stone is released 19.6meter above the street below.the initial velocity of the stone is 5.0m/s.determine the (a)total time that the stone is in the air (b)magnitude and direction of the velocity"...
Tuesday, July 28, 2015 by anthony

Physics
A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
Tuesday, July 28, 2015 by Anonymous

Physics
Three children are trying to balance on a seesaw. The seesaw is 3.9 m long and pivots about a rock at its center. Louie and Laura are already sitting on opposite ends. If Martha weighs 27 kg, where should she sit so as to balance the seesaw? 50kg kid--------------35kg kid...
Tuesday, July 28, 2015 by Anonymous

Physics
A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
Tuesday, July 28, 2015 by Anonymous

Physics
A bolt requires tightening to a torque of 98 N-m. If a wrench is 28 cm long, what perpendicular force should be applied at its end?
Tuesday, July 28, 2015 by Anonymous

physics
our charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric ...
Tuesday, July 28, 2015 by Lauren

Physics
A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
Tuesday, July 28, 2015 by Anonymous

Physics
A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.0 m and mass 800 kg, find the torque required to produce that acceleration. Neglect the ...
Tuesday, July 28, 2015 by Anonymous

physics
Sam travels east on his kayak for a distance 1.00km.Then,he heads 60 degrees South of East for 0.75km and finally veers at 20 degrees north of east for 0.5km.At the end of his trip,where is Sam reletion to his starting piont?
Tuesday, July 28, 2015 by daina

Physics
The spin-drier of a washing machine slows down uniformly from 700 rpm (revolutions per minute) to 140 rpm while making 50 revolutions. Find the angular acceleration through these 50 revolutions. Express your answer in rad/s^2.
Tuesday, July 28, 2015 by Anonymous

Physics
A belt passes over a wheel of radius 25 cm. If a point on the belt has a speed of 26 m/s. How fast is the wheel turning? Express your answer in rad/s.
Tuesday, July 28, 2015 by Anonymous

Physics
0.4kg bullet is fired from a gun at a speed of 100 m/s . If the bullet rises straight up into the air, what is the maximum height that the bullet can reach?
Tuesday, July 28, 2015 by JOYE

Physics
Romeo takes a uniform 11 m ladder and leans it against the smooth wall of the Capulet residence. The ladder's mass is 18.0 kg, and the bottom rests on the ground 2.8 m from the wall. When Romeo, whose mass is 79 kg, gets 90% of the way to the top, the ladder begins to slip...
Tuesday, July 28, 2015 by Anonymous

Physics
A particle is projected from the surface of Earth with a speed equal to 2.4 times the escape speed. When it is very far from Earth, what is its speed? ?km/s
Monday, July 27, 2015 by Anonymous

Physics
What distance does Anna covered by running on a circular track of length 500m?
Monday, July 27, 2015 by Edgar

Physics
What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.
Sunday, July 26, 2015 by Tommy

Physics
a full draw is the maximum distance that an archer can pull an arrow. Using the recurve bow shown below, a particular archer requires an average force of 130N to pull a full draw of 70.0cm. (when the arrow is relaxed in the bow, there is a distance of 30.0cm btween the arrow ...
Sunday, July 26, 2015 by Brandy

Physics
An officer is investigating an accident. A car has struck a pedestrian at a school crosswalk.There are no witnesses to the accident. The officer measures the coefficient of friction at the accident site to be 0.55, and he measures skid marks that are 52m long. What is the ...
Sunday, July 26, 2015 by Beth

Physics
A pole-vaulter just clears the bar at 4.42 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3800 J. What is his weight?
Sunday, July 26, 2015 by zee

physics
8. Two blocks of masses 50 Kg & 30 Kg, lie on two smooth inclined planes of 30° and 60° through a light rope which passes over a smooth pulley at junction of two planes. Calculate common acceleration and tension in rope
Sunday, July 26, 2015 by srinivasan

Physics
Canadian geese move up and down on the surface of a lake. If one moves up and down 15 times a minute and you estimate the distance between the wave crests to be 1 m, determine the speed of the water F = rpm F = 15/60 F = .25 V = wavelength * Frequency v = 0.25 m/s Thank you
Sunday, July 26, 2015 by Lucina

physics
the bob of a simple pendulum has a mass of 0.03kg.determine the weight of the bob
Saturday, July 25, 2015 by jude

physics(capacitors)
A sheet of paper 40mm wide and (1.5 x 10^-2) thick is placed between a metal foil of the same width is used to make a 2.0 UF capacitor. If the dielctric constant(relative permitivity of the paper is 2.5 ,what length of paper is required?
Saturday, July 25, 2015 by benjamin

Physics
A 6.0mc is placed at the origin and -4.0mc is placed at 2.0m to the right. What is the force on F1,F2? The first charge due to the presence of second charge ? What is the force on the second charge due to the presence of first charge?
Saturday, July 25, 2015 by Mark adrian

Physics
In the figure, a thin uniform rod of mass m = 3.05 kg and length L = 1.11 m rotates freely about a horizontal axis A that is perpendicular to the rod and passes through a point at a distance d = 0.201 m from the end of the rod. The kinetic energy of the rod as it passes ...
Saturday, July 25, 2015 by Bruce

physics
mod of a cap - b cap = ¡Ì2 then calculate the value of mod of a cap + ¡Ì3b acp
Saturday, July 25, 2015 by Vijay

physics
The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 20 decibels, the new intensity (in ìW/cm2) is : a. 60 b. 6.6 c. 6.06 d. 600 E. 12
Friday, July 24, 2015 by khaled fayek

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Homework Help: Science