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January 21, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Is the photoelectric effect a direct consequence of the wave character of E.M radiation or of the particle character of E.M radiation?
Wednesday, December 7, 2016 by JAY

PHYSICS
Particles called mesons are produced by accelerator beams. if these particles travel at 2.70* 10^8 m/s and live 2.60*10^-8 s when at rest relative to an observee how long do they live as viewed in the laboratory?
Wednesday, December 7, 2016 by JAY

Physics
A mango is dropped and falls freely from rest what are its position and velocity after 1.0s,2.0s, and 3.0s
Wednesday, December 7, 2016 by Aliyu lawan danzomo

physics
How much work is done in lifting a 300 Newton rock 10 meters from the ground?
Wednesday, December 7, 2016 by battang

physics
What is the time constant of a 10 H inductor and a 200 ohm resistor connected in series? Is my work correct? I did: T= L/R = 10 H divided by 200 ohm = 0.05 seconds = 50 milliseconds mS. Is that correct?
Tuesday, December 6, 2016 by Brett

Physics
A bungee jumper runs off a platform and falls 40m before his bungee cord begins to stretch. Once the bungee cord begins to stretch his velocity slows by 20 m/s in 12m. If the mass of the bungee jumper is 55kg, what is the average force the bungee applies on him?
Tuesday, December 6, 2016 by A

Physics
A 100 watts light bulb has an average life of 2000 hours. How much energy does it consume over its lifetime? The only thing I got was power=100 watts and time = 2000 hours but I need to convert to seconds and I don't kn how to do that.
Tuesday, December 6, 2016 by Salma

Physics!!!!!!
A 0.18 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of −360 N. a) How long does it take this force to stop the ball? b) How far does the ball travel before stop- ping?
Tuesday, December 6, 2016 by Anonymous

physics
In the circuit we have E=48V, R=6 ohm and L=4H. We close the switch at the instant t=0, the current I in the circuit grows from zero to its maximum value Io, and the permanent phase is established. A) determine the value of Io. B) calculate the values of the potential ...
Tuesday, December 6, 2016 by vicky

physics
The self induced e.m.f created in a coil has the value of 24mV at the instant when the current is 4A and varies at the rate of 10A/s. What is the value of the self magnetic flux kn the coil at this instant?
Tuesday, December 6, 2016 by vicky

physics
if copper rod has a length of 2m at 30 °C. what is its length at 70 °C ?
Tuesday, December 6, 2016 by alia

physics
the speed of sound in air at 0°C is 330m/s. at what temperature will the velocity of sound become 366m/s ?
Tuesday, December 6, 2016 by alia

physics
A wooden box, with a mass of 22 kg, is pulled at a constant speed with a rope that makes an angle of 25° with the wooden floor. What is the tension in the rope?
Tuesday, December 6, 2016 by adam

Physics
Your 2000 kg car is going 40 m/s on the highway when you see a police car up ahead. You apply the maximum 10000 N of brake force to slow your car down to the speed limit of 30 m/s. How many seconds will it take you to get down to the speed limit?
Tuesday, December 6, 2016 by Rebecca

physics
A Syringe is filled with a solution of viscosity n=1.75x10^-3 pa s. The plunger of syringe has cross sectional area 9 x 10^-5 m^2. The needle has length 30mm and internal radius 3 x 10^-4 m. Intravenous pressure in patient is 2.0 kPa. What force must be applied to plunger of ...
Tuesday, December 6, 2016 by Hannah

physics
An electron beam is accelerated through 50kv potential difference and then passes through magnetic field produced by coils for 1cm the screen is located 10 cm from end is 50 cm wide.when the field is turned off the beam stikes the centre of screen.what field strength is ...
Tuesday, December 6, 2016 by Anonymous

Physics
Hi, do you know how angular velocity relates to a "tight spiral" in football?
Monday, December 5, 2016 by Donna

physics
A wire of length 60cm and mass 10kg is suspended by a pair of flexible leads in a magnetic field magnitude and direction of the current required to remove the tension in the supporting leads.
Monday, December 5, 2016 by Mztura

physics
A tuning fork is set into vibration above a vertical open tube filled with water. The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube opening to the water...
Monday, December 5, 2016 by kassy

physics
An organ pipe is 81 cm long and at a temperature of 20 degrees C. What is the fundamental (in Hertz) if the pipe is closed at one end?
Monday, December 5, 2016 by kassy

physics
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.20 s after shouting. How long (in meters) is the lake?
Monday, December 5, 2016 by kassy

physics
A guitar string is 97 cm long and has a mass of 3.6 g. The length L from the bridge to the support post is 61 cm, and the string is under a tension of 570 N. What is the frequency of the fundamental tone?
Monday, December 5, 2016 by kassy

physics
A rope of mass 0.73 kg is stretched between two supports 31 m apart. If the tension in the rope is 1100.0 N, how long (in seconds) will it take a pulse to travel from one support to the other?
Monday, December 5, 2016 by kassy

General Physics II
Hi, this is about thin film interference in ray optics. My book presents two similar problems, but somehow uses different paths for the same variable. I'll list out the given variables: --Problem A-- n1 < nf > n2, delta phase is therefore lambda over two. Film ...
Monday, December 5, 2016 by Justin

Physics
A 55.0 kg diver steps off a diving board and drops straight down into the water. The water provides an upward average net force 1480 N. If the diver comes to rest 5.6 m below the water's surface, what is the total distance between the diving board and the diver's ...
Monday, December 5, 2016 by Julia

Physics
We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J into another system. What is the efficiency of the heat engine? Please don't give me the answer! Just help figure out how to find it! The description for the lesson with this question was...
Monday, December 5, 2016 by Leila

Physics
ou build a loop-the-loop in your backyard. It has a diameter of 3.10 m. a) How fast will you have to be moving at the top of the loop to avoid falling off? b)If you'll be coasting from the time you get to the bottom of the loop, how fast will you have to be going at the ...
Monday, December 5, 2016 by Mary

Physics
Two identical racing horses go around a semicircular turn in a racecourse. The horses have the same speed, but horse A is on the inner side while horse B is on the outer side of the circular turn. Which horse has the greater acceleration while in the turn?
Monday, December 5, 2016 by Bloop

Science Physics
I don't understand how I would know what would happen if it collided or bounced, etc. How do I solve a question like this? Suppose the total momentum of two masses before collision is 100kg m/s. What is the total momentum of the two masses after they collide? 0 kg m/s 50 k...
Monday, December 5, 2016 by Jake

Physics
Kate (m = 50 kg) is swinging on a tire tied by a (light) rope (L = 3 m) to a tree limb. Her twin Ashley comes along and squeezes into the tire with her. Assume that at all times the centre of mass of the person(s) riding the tire is at the end of the rope. a) What was the ...
Sunday, December 4, 2016 by Anonymous

Physics
A mass (0.5 kg) and spring (k = 250 N/m) system oscillates with an amplitude of 3.5 cm. a) What is the total mechanical energy of the system? b) What is the maximum speed of the mass? c) What is the maximum acceleration of the mass? I need help please. What equation should I ...
Sunday, December 4, 2016 by Anonymous

Physics
A 0.5 kg air-track car is attached to the end of a horizontal spring of constant k = 20 N/m. The car is displaced 15 cm from its equilibrium point and released. a) What is the car's maximum speed? b) What is the car's maximum acceleration? c) What is the frequency f of...
Sunday, December 4, 2016 by Anonymous

Physics
A 200kg wagon is pushed along a horizontal surface at a constant 10m/s when it is released. After rolling a distance of 45m the wagon comes to a complete stop. Find the coefficient of friction.
Sunday, December 4, 2016 by Emma

Physics
A 15 kg box is given an initial push to start it moving up a frictionless ramp with angle theta = 30 degree and length delta r = 22m. What horizontal force F will keep the box moving with constant speed to the top of the ramp?
Sunday, December 4, 2016 by Mary

Physics
A ball having a weight of 1.5 N is dropped from a height of 4 meters. (Neglect air friction.) How much mechanical energy is "lost" just before it hits the ground?
Sunday, December 4, 2016 by Noah Alvarado

Physics!!!!!!
In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 5.0 m away. After a running start, he leaps at an angle of 10â—¦ with respect to the flat roof while traveling at a speed of 5.6 m/s. The acceleration...
Sunday, December 4, 2016 by Anonymous

Physics
(a) If the wavelength of an electron is 5.37 ✕ 10−7 m, how fast is it moving? (b) If the electron has a speed equal to 3.80 ✕ 106 m/s, what is its wavelength? What equation should I use?
Sunday, December 4, 2016 by Jake

physics
A daredevil is shot out of a cannon at 49.7â—¦ to the horizontal with an initial speed of 29.9 m/s. A net is positioned at a horizontal dis- tance of 49.8 m from the cannon from which the daredevil is shot. The acceleration of gravity is 9.81 m/s2 . At what ...
Sunday, December 4, 2016 by Kacie

physics
In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 4.4 m away. After a unning start, he leaps at an angle of 17â—¦ with respect to the flat roof while traveling at a speed of 4.3 m/s. The acceleration ...
Sunday, December 4, 2016 by Kacie

physics
A force is applied to a 3 kg mass and produces 5 m/s 2 acceleration. What acceleration would be produced by the same force applied to a 12.2 kg mass? Answer in units of m/s 2 .
Sunday, December 4, 2016 by jorge

PHYSICS HELP
Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...
Sunday, December 4, 2016 by David

physics (urgent)
Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...
Sunday, December 4, 2016 by David

Physics
A 52.4 kg pole vaulter running at 10.8 m/s vaults over the bar. The acceleration of gravity is 9.81 m/s2 . If the vaulter’s horizontal component of ve- locity over the bar is 0.60 m/s and air resis- tance is disregarded, how high is the jump? Answer in units ...
Sunday, December 4, 2016 by Anonymous

PHYSICS (REALLY DIFFICULT PLEASE HELP)
At a temperature of 18.0°C of 23.0cm^3 of a certain gas occupies has pressure of 103 kPa. (a) What volume would the gas occupy at a temperature of 0.00°C and pressure of 101kPa? (b) 1.00 moles of a certain gas occupies a volume of 22.4 litres at 0.00&...
Sunday, December 4, 2016 by Josh

Physics
In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 5.0 m away. After a running start, he leaps at an angle of 10â—¦ with respect to the flat roof while traveling at a speed of 5.6 m/s. The acceleration...
Sunday, December 4, 2016 by Anonymous

Physics
A daredevil is shot out of a cannon at 44.9â—¦ to the horizontal with an initial speed of 27.5 m/s. A net is positioned at a horizontal dis- tance of 41.2 m from the cannon from which the daredevil is shot. The acceleration of gravity is 9.81 m/s2 . At what ...
Sunday, December 4, 2016 by Anonymous

physics 2
How much higher will mercury stand in the open arm in a J-Tube manometer, if air column in the closed arm is reduced to 4 cm, the mercury id at the same level in both open and closed arms when the air column in the closed arm is 15 cm long. Assume barometric pressure, 1 atm.
Sunday, December 4, 2016 by prince

physics
A 2000-kg automobile with four-wheel drive and weight distributed equally on the four 60-cm diameter wheels can accelerate from 0 to 27 m/s (60 MPH) in 6 seconds. a. Calculate the minimum coefficient of static friction between the tires and the ground. (10 pts.) b. What torque...
Sunday, December 4, 2016 by jennifer

Physics
A car of weight 1.4*10^4N is moving up an incline at a constant speed of 6.2 m/s . The incline makes an angle of 5.0 to the horizontal. A frictional force of 600 N acts on the car in opposite direction. State the net force of the car
Sunday, December 4, 2016 by Ashlin

physics
Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field ...
Sunday, December 4, 2016 by ainul

Physics
Santa Claus (mass = 150 kg) is leaning his sled(mass = 50 kg, length = 6 m) at an angle of 72° against the wall of the house to enter from the roof the living room. Considering a coefficient of friction of 0.29 between the ground and the sled and no friction between...
Sunday, December 4, 2016 by Chika

Physics
Material X has a coefficient of linear expansion a = 0.00000271/degree C. What value would you expect its volume coefficient of expansion to be
Saturday, December 3, 2016 by Mary

Physics
A baseball is thrown at an angle of 20â—¦ relative to the ground at a speed of 25.8 m/s. The ball is caught 43.6152 m from the thrower. The acceleration due to gravity is 9.81 m/s2 .
Saturday, December 3, 2016 by Anonymous

Physics
If a ball is rolling down an inclined ramp straight, will the change in position be squared for every passing second or would it just be multiplied by two? I'm not sure if this makes sense so here's what I mean in an example for the change in position will be squared ...
Saturday, December 3, 2016 by Alison

Physics
To a cyclist riding west at 20 kg/hr, the rain appears to meet him at an angle of 45° with the vertical. When he rides at 12 km/hr, the rain meets him at an angle of 19°48’ with the vertical. What is the actual direction of the rain?
Saturday, December 3, 2016 by Gul

Physics
Not at all sure where to start with this problem. Any help would be appreciated! The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s...
Saturday, December 3, 2016 by Jamie

Physics
A 30 kg child sits in a swing supported by two chains, each 1.4 m long. (a) If the tension in each chain at the lowest point is 265 N, find the child’s speed at the lowest point. (Neglect the mass of the seat.) Answer in units of m/s. (b) Find the force of ...
Saturday, December 3, 2016 by alicia

Physics
A pan flute is based on standing wave resonance in a tube that is open where the musician blows and closed at the bottom end with bee’s wax. (a) Describe the standing wave pattern of air displacement in such a tube when a tone is played. (b) Determine the ...
Saturday, December 3, 2016 by Jamie

Physics
Two kids sitting on opposite sides of a small lake use sticks to beat the surface of the water at a frequency f=1.5 Hz. They notice that a standing wave pattern develops between the points where they are disturbing the water surface. They count n=5 nodes over the L=10 m ...
Saturday, December 3, 2016 by Jamie

Physics
The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s. a) Calculate the total shift in frequency detected by the pedestrian as the ...
Saturday, December 3, 2016 by Jamie

Physics
Poiseuille’s equation relates the volumetric flow rate Q (volume per time unit) to the pressure differential ΔP that drives the flow: Q = (πr^4)/(8η) x (ΔP/L) Here η is the viscosity of the fluid ...
Saturday, December 3, 2016 by Jamie

Physics
Any help appreciated! Pull out a blank piece of paper from your exam book. Hold it from one of its ends and blow air horizontally over the top of the paper as shown in the figure below. If you blow hard enough you will see the paper rise to become almost horizontal. (a) ...
Saturday, December 3, 2016 by Jamie

physics
Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field ...
Saturday, December 3, 2016 by aishah

Physics
You build a loop-the-loop in your backyard. It has a diameter of 3.10 m. a) How fast will you have to be moving at the top of the loop to avoid falling off? The answer I got was 3.90 m/s. Is this correct? b)If you'll be coasting from the time you get to the bottom of the ...
Saturday, December 3, 2016 by Susan

Physics
A 0.5 kg air-track car is attached to the end of a horizontal spring of constant k = 20 N/m. The car is displaced 15 cm from its equilibrium point and released. a) What is the car's maximum speed? b) What is the car's maximum acceleration? c) What is the frequency f of...
Friday, December 2, 2016 by Anonymous

Physics
A mass (0.5 kg) and spring (k = 250 N/m) system oscillates with an amplitude of 3.5 cm. a) What is the total mechanical energy of the system? b) What is the maximum speed of the mass? c) What is the maximum acceleration of the mass? I need help please! Do it step by step and ...
Friday, December 2, 2016 by Anonymous

Physics
Kate (m = 50 kg) is swinging on a tire tied by a (light) rope (L = 3 m) to a tree limb. Her twin Ashley comes along and squeezes into the tire with her. Assume that at all times the centre of mass of the person(s) riding the tire is at the end of the rope. a) What was the ...
Friday, December 2, 2016 by Anonymous

Physics
a stationary 25 kg object is located on a table near the surface of the earth. The coefficient of static friction between the surface is 0.50 and of kinetic friction is 0.30.
Friday, December 2, 2016 by Josh

physics
the maximum height attained by the projectile motion is 600m and the range is 500m find a. angle of projection b. velocity of projection c. total time of flight
Friday, December 2, 2016 by vanny

Physics
A photographer uses a camera lens with focal length of 50.0 mm to photograph a tree that is 4.60 m tall. She wishes to fill her 24.0-mm slide with the tree. a) how far from the lens should the film be? b) what is the magnification of the image?
Friday, December 2, 2016 by Lisab

physics
A 1.26×103 kg car accelerates uniformly from rest to 14.8 m/s in 2.79 s. What is the work done on the car in this time interval?
Friday, December 2, 2016 by lovt

Physics
1)We consider a hot-air balloon of mass 251 kg (basket and envelope). The spherical envelope of the balloon has a diameter of 19 m when fully inflated. To what temperature (in °C) must the enclosed air be heated for the balloon to carry five standard men? Assume the...
Friday, December 2, 2016 by Noah

Pressure in Physics
Calculate the pressure of the body with mass 60kg and area of 10m2.
Friday, December 2, 2016 by Marvin

Physics
Alice is going on a picnic and is aware that it will be easier to carry the picnic basket if it balances at the center where the handle is attached. She has placed a 2.15-kg container of potato salad at one end and a 0.750-kg package of hot dogs at the other end of a 52.0-cm ...
Friday, December 2, 2016 by Zachary

Physics
A square loop,circular loop prepared from a straight wire of length L are moved out of a uniform magnetic field,acting normal to the plane of the paper at a constant velocity v.Draw the variation of induced emf with time for both the loops. How will the graphs look
Friday, December 2, 2016 by Raj

Physics
Given below are the some of the function of x and t to represent the displacement (transverse or longitudnal ) of an elastic wave . State whether it is stationary or travelling wave or none of them. (i) y = 3sin(5x+0.5t) + 4cos(5x+0.5t) (ii) y = 3sin(5x+0.5t) + 4cos(5x-0.5t) (...
Friday, December 2, 2016 by Raj

Physics
A hoop of mass 'm' is projected on a floor with linear velocity 'v' and reverse spin 'w'. The co efficient of friction is 'u'. What is the (i) time of pure rolling? (ii) velocity of return?
Friday, December 2, 2016 by Raj

Physics
If 0.01% of electrons are removed from 18 gm water, then calculate the charge produced in the water.
Friday, December 2, 2016 by Raj

Physics
The crew men in space are discussing whether they can crack a wall nut with a hammer. Man A says that hitting wall nut with a hammer would be no more effective than hitting it with a feather. Because the hammer is weightless in space. Man B says that he found mass of the ...
Friday, December 2, 2016 by Raj

Physics
Water flows through a garden hose that goes up a step 20.0 cm high. The cross sectional area of the hose on top of the step is half that at the bottom of the step. If the water pressure is 143 kPa at the bottom of the step, and the speed of the water at the bottom of the step ...
Friday, December 2, 2016 by Micah

PHYSICS (PLEASE HELP ME ASAP)
At a temperature of 18.0°C of 23.0cm^3 of a certain gas occupies has pressure of 103 kPa. (a) What volume would the gas occupy at a temperature of 0.00°C and pressure of 101kPa? (b) 1.00 moles of a certain gas occupies a volume of 22.4 litres at 0.00&...
Friday, December 2, 2016 by Daniel

Physics
What consumes when work is done
Friday, December 2, 2016 by Forum

Physics
A tennis ball is served from the back line of the court such that it leaves the racket 2.4 m above the ground in a horizontal direction at a speed of 22.3 m/s. (a) will the ball cross a 0.91-m-high net in front of the server? Will the ball land in the service court, which is ...
Thursday, December 1, 2016 by Lauren

Physics
A box is given a push up a 26.0° incline. When it reaches the bottom again it is only going 0.51 its original speed. Find the coefficient of kinetic friction.
Thursday, December 1, 2016 by Rose

Physics
A 1.5 kilowatt electric motor on a water well pumps water from 10 meters below the surface. The density of the water is 1 kilogram per liter. How many liters of water does the motor pump in one hour?
Thursday, December 1, 2016 by Anonymous

Physics
How long would it take a 1.5 x 10^5 kilogram airplane with engines that produce 100 megawatts of power to reach a speed of 250 m/s at an altitude of 12 kilometers is air resistance were negligible? If it actually takes 900 seconds, what is the power? Given this power what is ...
Thursday, December 1, 2016 by Anonymous

Physics
One of their side jobs is a safe delivery and installation. A pulley system is used to lift the safe 2 meters above the ground. But the rope snaps! To avoid cracking from any drops, a large, stiff spring is placed below the safe while it's lifted. If the 1200 kilograms ...
Thursday, December 1, 2016 by Anonymous

Physics
On a hot summer day, you've got nothing better to do than play with ice cubes. You are currently sliding a 75 gram Ice Cube up and down a basically frictionless slope. At the bottom of the slope, which is inclined at 30 degrees relative to the horizontal, Is a spring with ...
Thursday, December 1, 2016 by Anonymous

Physics
You find yourself driving 35 kilometers an hour when you take your foot off the accelerator and descend 18 meters into the valley. Just as you reach the bottom, you see a policeman hiding between a speed limit sign that reads 70 kilometers per hour. Will he issue you a ...
Thursday, December 1, 2016 by Anonymous

Physics
After school you have been working on your slingshotmanship. Interested in the physics of the slingshot, you take data that compares the force of the extended slingshot versus the displacement from equilibrium. You think this graph is very similar to that of a spring so you ...
Thursday, December 1, 2016 by Anonymous

Physics
The modern boxing glove was introduced in 1743. Before then, gloves weren’t used. Let's assume that the average boxer's arm has a mass of 7 kilograms and reaches 10 m/s before hitting an opponent's face. If upon Collision the face was compressed ...
Thursday, December 1, 2016 by Anonymous

Physics
The kinetic friction force between a 60kg object and a horizontal surface is 50N. If the initial speed of the object is 25m/s, what distance will it slide before coming to a stop?
Thursday, December 1, 2016 by Carl

Physics
The latent heat of vaporization for water is Lv = 540cal/g = 2.26*10^6 J/kg. If 300 g of water went from the room temperature, 22 degrees C, to 50 degrees C in the calorimeter, how much steam (expressed in grams) was produced? So Idk if it's a trick question cause I ...
Thursday, December 1, 2016 by Evette

Physics
a coin is placed on a stereo revolving at 33.3 revolutions per minute. what is its centripetal acceleration when it is placed 5 cm from the center of the turntable?
Thursday, December 1, 2016 by Izzy

physics
Calculate the kinetic energy of a tennis ball with a mass of 58g served by Andy Murray at 58 m/s
Thursday, December 1, 2016 by bekyyyyyy

physics
a stone is dropped from a height of 100 m. How long will it take to hit the ground? with what speed will it hit the ground?
Thursday, December 1, 2016 by jason

Physics
Find the orbital speed of a satellite in a circular orbit 3.70×107 m above the surface of the Earth. v = 3030 m/s So I've been trying to solve this problem for some time now and haven't figured it out. What I did is find orbital radius, use that to find ...
Thursday, December 1, 2016 by Alvin

physics
the angular speed of the hour hand of a clock is
Thursday, December 1, 2016 by jason

physics
at any instant a car is observed to be moving at a velocity of 10 m/s. Five seconds later the car is found to be moving at a velocity of 20 m/s. how far did the car travel in 5 s?
Thursday, December 1, 2016 by jason

physics
an object of mass 10 kg is at rest when a net force of 20 N acts on it in a direction east. The acceleration produced on the object is? a) 2 m/s^2 in the direction east b) 2 m/s^2 in the direction west c) 0.5 m/s^2 in the direction east d) 0.5 m/s^2 in the direction west e) ...
Thursday, December 1, 2016 by tim

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