Thursday
February 23, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics - Potential Difference
An electron moving in the + x-direction has an initial speed of 3.7*10^6 m/s at the origin. Its speed is reduced to 1.4*10^5 m/s at x = 2cm. Calculate the potential difference between the origin and that point. Which point is at the higher potential? My work and calculations...
Wednesday, February 15, 2017 by Kid

Physics
A cyclist and his bicycle have a combined mass of 55kg. Total area of the tyres in contact with the road is 2.2 in contact with pressure exerted by the two on the ground.
Wednesday, February 15, 2017 by Angie

physics
a typical person can tolerate an acceleration of about -49m/s2 (forward). If you are travelling at 110km/h and have a collison with a solid immovable object, over what minium distance must you stop so as to not exceed this acceleration
Wednesday, February 15, 2017 by nessa

physics
a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity
Wednesday, February 15, 2017 by dan

Physics
A cubes weight 15N in air and 20N when totally immersed in water. Find the value of the cube of the density. Please I need the answer.
Wednesday, February 15, 2017 by KAUNA

Physics
A cube weight 15N in air and 20N when totally immersed in water. Find the value of the cube of the density.
Wednesday, February 15, 2017 by KAUNA

Physics
A car of mass 1000kg starting from rest and comes down an incline slope if it travel 300m in 30 second calculate i) acceleration ii) force
Wednesday, February 15, 2017 by Qamar

Physics
A Simple Astronomical Telescope In Normal Adjustment Has An Objective Of Focal Length 100cm And An Eye Piece Of Focal Length 5cm What Is The Angular Magnification (a) 20 (b) 25 (c) 1/20 (d) 1/25
Wednesday, February 15, 2017 by Godwin

Physics
A Simple Astronomical Telescope In Normal Adjustment Has An Objective Of Focal Length 100cm And An Eye Piece Of Focal Length 5cm What Is The Angular Magnification
Wednesday, February 15, 2017 by Godwin John

physics
A ball is thrown straight up with enough speed so that it is in the air for several seconds. Assume the positive direction is upwards. What is its velocity 1.5s before it reaches its highest point?What is the change in its velocity, v, during this 1.5-s interval? What is its ...
Tuesday, February 14, 2017 by barbara

Physics
What is the total amount of potential energy that can be stored in a 10,000 gallon water tower built with the water tank 61.50 m above ground level? <hint: You will need to look up the mass of a gallon of water in Kilograms>
Tuesday, February 14, 2017 by Matt

Physics
A 250.0 kg motorcycle can roll 45.9 m up a long hill before coming to a stop if the motorcycle approaches the base of the hill 30.0 m/s.
Tuesday, February 14, 2017 by Matt

Physics
The radius of curvature of a loop-the-loop for a roller coaster is 11.8 m. At the top of the loop (with the car inside the loop), the force that the seat exerts on a passenger of mass m is 0.80mg. Find the speed of the roller coaster at the top of the loop.
Tuesday, February 14, 2017 by Dalton

physics
A hole is drilled through a copper plate whose temperature is 17.2 °C. When the plate is heated to 191 °C, by what fraction (r-ro)/ro will the radius of the hole change?
Tuesday, February 14, 2017 by Micah

physics
A thin spherical shell of silver has an inner radius of 5.58 x 10-2 m when the temperature is 25.7 °C. The shell is heated to 133 °C. Find the change in the interior volume of the shell.
Tuesday, February 14, 2017 by Micah

physics
A flask is filled with 1.53 L (L = liter) of a liquid at 92.2 °C. When the liquid is cooled to 15.1 °C, its volume is only 1.36 L, however. Neglect the contraction of the flask. What is the coefficient of volume expansion of the liquid?
Tuesday, February 14, 2017 by Micah

physics
The Eiffel Tower is a steel structure whose height increases by 19.7 cm when the temperature changes from -9 to +40 oC. What is the approximate height (in meters) at the lower temperature?
Tuesday, February 14, 2017 by Micah

physics
A steel aircraft carrier is 358 m long when moving through the icy North Atlantic at a temperature of 1.99 °C. By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 22.0 °C?
Tuesday, February 14, 2017 by Micah

physics
A 0.32 kg box of macaroni is held in place at the front of a 3.14 kg shopping cart only by the force of static friction as the shopping cart accelerates. Determine the minimum acceleration, in m/s 2, that the shopping cart must have if the box is to be kept from falling if the...
Tuesday, February 14, 2017 by camilla

Physics
Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum on Earth is l, what should the length of...
Tuesday, February 14, 2017 by Grace

Physics
A child’s toy consists of plastic attached to a spring. The spring is compressed against the floor a distance of 2.46 cm, and the toy is released. The acceleration of gravity is 9.8 m/s2 . If the toy has a mass of 102 g and rises to a maximum height of 60.1 cm, estimate the...
Tuesday, February 14, 2017 by Ke

Physics
the funamental notes produced in an open and organ pipe and closed end organ pipe of same length are io ratio
Tuesday, February 14, 2017 by Vinay

Physics
Why the household appliances starts / runs as soon as we switch them on
Tuesday, February 14, 2017 by Nagalatha

Physics
two identical metallic ball spherical shells A and B charges 4Q and -10c are kept a certain distance apart a third uncharged sphere C is first placed in contact with sphere A and then with sphere B the sphere B are bought in contact and then separated find the charge on sphere...
Tuesday, February 14, 2017 by Anonymous

physics
A crate with a mass of (111.5) kg is lifted by a crane. If the crate is accelerating upward at (2.7) m/s2, what is the tension in the cable? Give your answer in newtons (N) and with 3 significant figures.
Monday, February 13, 2017 by dalia

Physics
A 1140 kg car traveling south at 24 m/s with respect to the ground collides with and attaches to a 2550 kg delivery truck traveling east at 16 m/s.
Monday, February 13, 2017 by Andrew

Physics
A turntable rotating at 33 1/3 rpm is shut off. It brakes with constant angular deceleration and stops in 26 seconds. Find the average angular acceleration. I took 33 1/3 divided by 26 and then tried to convert to rad/s^2 but I keep getting the wrong answer. How should I ...
Monday, February 13, 2017 by Zoey

Physics
Two capacitors C1 and C2 have both area A=0.01m^2 and separation d=0.02mm. Capacitor C1 is filled with a dielectric (dielectric constant k=3.4). Find the equivalent capacitance if the two capacitors are in series.
Monday, February 13, 2017 by Katarina

physics
An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 3.3 ✕ 10-14 m from the gold nucleus?
Monday, February 13, 2017 by jake

Physics
A child’s toy consists of plastic attached to a spring. The spring is compressed against the floor a distance of 2.46 cm, and the toy is released. The acceleration of gravity is 9.8 m/s2 . If the toy has a mass of 102 g and rises to a maximum height of 60.1 cm, estimate the...
Monday, February 13, 2017 by Ke

physics
a person riding a bicycle whose wheels have an angular velocity of 20 rad/s. The brakes are applied, and the bike is brought to a stop through a uniform acceleration. During braking, the angular displacement of each wheel is 15.92 revolutions. How long does it take for the ...
Monday, February 13, 2017 by Zoey

physics
The displacement of a block of mass 778g attached to a spring whose spring constant is 38N/m is given by x=Asin(ωt) where A=25cm. In the first complete cycle find the values of x and t at which the kinetic energy is equal to one half the potential energy. First position: ...
Monday, February 13, 2017 by kara

physics
A 300g particle oscillating in SHM travels 35cm between the two extreme points in its motion with an average speed of 30cm/s. Find: a) The angular frequency. b) The maximum force on the particle. b) The maximum speed.
Monday, February 13, 2017 by kara

physics
A 750g block is attached to a vertical spring whose stiffness constant is 1N/m . The block is released at the position where the spring is unextended. a) What is the maximum extension of the spring? How long does it take the block to reach the lowest point?
Monday, February 13, 2017 by kara

physics
A block attached to a spring is displaced from equilibrium to the position x=+0.5m and released. The period is 2.1s . At what positions and times during the first complete cycle do the following conditions occur. a) |v|=0.5vmax, Where vmax is the maximum speed? First position...
Monday, February 13, 2017 by kara

physics
With a block of mass m , the frequency of a block-spring system is 1.8Hz. When 50g is added, the frequency drops to 1Hz . Find m and the spring constant.
Monday, February 13, 2017 by kara

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)
Monday, February 13, 2017 by Anonymous

physics
The displacement of a block attached to a horizontal spring is given by x=0.5sin(7.8t−1.06)m What is the earliest time (t>0) at which x=0.16m? Find the acceleration when x=0.44m helppppppp
Monday, February 13, 2017 by kara

physics
A particle moving in simple harmonic motion passes through the equilibrium point (x=0) 9 times per second. At t=0t=0 its velocity at x=−0.01 m is negative. It travels 0.4 m in a complete cycle. The particle's position as a function of time is described by the following ...
Monday, February 13, 2017 by kloe

PHYSICS
A box is measured to have a length of L=(10.0+_0.01)FT A WIDTH OF W=(1.534+_0.002)FT AND A HEIGHT OF H=(0.013+_0.001)FT. FIND THE VOLUME OF THE BOX .WRIE THE EXPRESSION FOR V IN THE FOR OF EQUATION 2-3 AND FIND TTHE EXPRESSION FOR SIGN STANDARD DEVIATION V. COMPUTE STANDARD ...
Monday, February 13, 2017 by sintia

PHYSICS
PLEASE HELP WITH PART E AND F THANKS!! Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = THE ANSWER IS-34 Part B Express your answer in meters using two significant ...
Monday, February 13, 2017 by sintia

PHYSICS
Vector A⃗ points in the negative x direction and has a magnitude of 22 units. The vector B⃗ points in the positive y direction. partA:Find the magnitude of B⃗ if A⃗ +B⃗ has a magnitude of 37 units. partB: Sketch A⃗ and B⃗ . Draw the vectors with their tails at ...
Monday, February 13, 2017 by sintia

physics
A vector has the components Ax=−37m and Ay=44m. Part A What is the magnitude of this vector? Express your answer to two significant figures and include appropriate units. the answer for part A is help me with b pls 57 m Part B What angle does this vector make with the ...
Monday, February 13, 2017 by sintia

physics
a 5.4 kg ball slides along a friction-less, horizontal surface at 6.2 m/s. The ball then encounters a ramp which slopes upward. The ball slides up the ramp, slowing down until it stops and slides back down. what is the kinetic energy of the ball as it slides along the friction...
Monday, February 13, 2017 by andrea

physics
A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s. PLEASE explain :)
Monday, February 13, 2017 by Anonymous

physics
When the temperature of a thin silver [α = 19 × 10-6 (C°)-1] rod is increased, the length of the rod increases by 3.6 × 10-3 cm. Another rod is identical in all respects, except that it is made from gold [α = 14 × 10-6 (C°)-1]. By how much ΔL does the length of the ...
Monday, February 13, 2017 by Micah

physics
calculate angular momentum and rotational kinetic energy of earth about its own axis
Monday, February 13, 2017 by Anonymous

Physics
1. Calculate the kinetic energy of a 5.2kg object moving at 2.4 m/s 7. Calculate the potential energy of a 5.2kg object positioned 5.8m above the ground 21. Calculate the speed of a 5.2 kg object that possesses 26.1 J of kinetic energy.
Sunday, February 12, 2017 by Mary

physics
a force of 372 N is used to move a piano with a maass of 532 kg up a ramp 14 m long. what is the vertical height of the ramp
Sunday, February 12, 2017 by Rachel

Physics Answer Check
A note played by a musical instrument has a frequency of 130.8 Hz. What would be the length of the pipe if an organ pipe had this frequency as the fundamental and if the speed of the sound in the pipe is 350 m/s? f = v/2L 130.8(2L) = 350 2L = 2.68 L is about 1.34 m.
Sunday, February 12, 2017 by Anonymous

physics
Two identical balls A and B are released from the positions .They collide elastically on horizontal position MN. The ratio of the heights attained by A and B after collision will be ?
Sunday, February 12, 2017 by dharmapal

physics
A ball is let fall from a hight h0.There are n collisions with the earth . If the velocity of rebound after n collisions is vn and the ball rises to a hight hn , then coefficient of restitution e is given by ,
Sunday, February 12, 2017 by dharmapal

physics
A ball of mass m moving with speed V collides with another ball of mass 2m(e=1/2) in a horizontal smooth fixed circular tube of radius R . Time after which next collision will take place is?
Sunday, February 12, 2017 by dharmapal

physics
A ball A of mass M collides elastically with another identical ball B at rest .Initially velocity of ball A is u m/s.After collision
Sunday, February 12, 2017 by dharmapal

physics
a body of mass 65kg falls freely from rest through a height of 50m find the average force exerted by the ground to bring the body to a rest
Sunday, February 12, 2017 by alex chidera

Physics
An object with a mass of (2.844x10^1) kg is subjected to a force of (3.964x10^3) N directed at an angle of (6.374x10^1) degrees from the x axis. A second force of (1.3x10^2) N acting in the negative X directions is also applied to the object. To two significant figures what is...
Sunday, February 12, 2017 by Christine

physics
A mechanic pushes a 3090 kg car from rest to a speed of v, doing 5497 J of work in the process. During this time, the car moves 22.1 m. Find the speed v. Neglect friction between car and road. Answer in units of m/s. 1/2mv^2 doesnt work
Sunday, February 12, 2017 by Mitchell

Physics
A force F 1 of magnitude 5.90 units acts on an object at the origin in a direction θ = 28.0° above the positive x-axis. (See the figure below.) A second force F 2 of magnitude 5.00 units acts on the object in the direction of the positive y-axis. Find graphically the ...
Sunday, February 12, 2017 by McKynzlea

physics
a car with 4 wheels has the tyres at a pressure of 20N/cm2. Each tyre of 100cm2 in contact with the road. what is the weight of the car.
Sunday, February 12, 2017 by fiyin

Physics
A stone, 2kg is projected vertically at a velocity of 5m/s at an Angle of 60° Calculate I.Time taken to attain maximum height II.maximum height reached III.The range
Sunday, February 12, 2017 by Emmanuel

physics
Question 01: 2.0g of Nitrogen gas is at 270C in a fixed volume. If 20% of its total internal energy is due to rotation what is the average velocity of nitrogen molecules? What will be the temperature 2.0 g of Helium gas in a fixed volume if the average velocity of its ...
Sunday, February 12, 2017 by hash

Physics
If two balls made of iron and aluminium of equal volumes are immersed in a liquid, then will they experience equal up- thrust? Justify your answer.
Sunday, February 12, 2017 by Sriya

Physics
If the heat of 110J is added to a gaseous system, change in internal energy is 40J, then the amount of external work done is?
Sunday, February 12, 2017 by Anshu

PHYSICS
--------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree
Saturday, February 11, 2017 by Anonymous

physics
Seven measurements of the length of a table in centimeters are 184.7, 182.3, 182.7, 182.1, 182.2, 184.1, and 182.9. Find the best estimate for the length of the table. Be sure to include units! Answer: Seven measurements of the length of a table in centimeters are 184.7, 182.3...
Saturday, February 11, 2017 by ana22

*physics*
what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.
Saturday, February 11, 2017 by Anonymous

Physics
Calculate the final centigrade temperature required to change 20 litres of gas at 120°C and 1 atmosphere to 25 litres at 2 atmosphere.
Saturday, February 11, 2017 by Busola

Physics
A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also.
Saturday, February 11, 2017 by Anonymous

physics
You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 30.0 m above its launch point part A:What was the arrow's initial speed?part B:How long did it take for the arrow to first reach a height of 15.0 m above its launch ...
Saturday, February 11, 2017 by ana22

Physics
I drew out image of the situation but still need help. Can someone help with this problem about swinging on wrecking ball when at 1st: wrecking ball is in line with birdbath when at a peak in its trajectory, and in line with front door at the lowest point in the trajectory. ...
Saturday, February 11, 2017 by henry

physics
Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = Part B Express your answer in meters using two significant figures. |A⃗ | = m Part C B⃗ =( 2.5 m )x^+( 16 m )y^ ...
Saturday, February 11, 2017 by ana22

Physics
a periscope is an optical instrument made of two plane mirrors inclined at an angle 45 with respect to the axis of the tube. an observer places her eye at point O. draw the path of a ray light issued from A. determine the position and the nature of the image of A given by two ...
Saturday, February 11, 2017 by Sarah

physics
For a flourish at the end of her act, a juggler tosses a single ball high in the air. She catches the ball 3.6 s later at the same height from which it was thrown. Part A-What was the initial upward speed of the ball?2sf
Saturday, February 11, 2017 by ana22

Physics
what are the factors that does not affect the time period of pendulum ?? Please help me in monday there is my exam please help me:-(
Saturday, February 11, 2017 by Raghav

physics
a car of mass 800kg attains a speed of 25m/s in a second.calculate the power developed in the engine
Saturday, February 11, 2017 by Rantimi

physics
How much elastic potential energy is stored if a 5kg object is suspended from a whose spring constant is 100N/m
Saturday, February 11, 2017 by Muller

Physics
While swinging on the wrecking ball, a student notices that, at first, the wrecking ball is in line with her birdbath when it is at a peak in its trajectory, and in line with her front door at the lowest point in the trajectory. However, since drag is acting against the ...
Friday, February 10, 2017 by henry

Physics
While swinging on the wrecking ball, a student notices that, at first, the wrecking ball is in line with her birdbath when it is at a peak in its trajectory, and in line with her front door at the lowest point in the trajectory. However, since drag is acting against the ...
Friday, February 10, 2017 by henry

physics
How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50∘C to 50∘C?
Friday, February 10, 2017 by Anonymous

Physics
Hello, I have a question and I would like to know if anyone can help me. Well I was reading about the motion of an ideal "yo-yo" and I found that mechanical energy is conserved, but there´s something that I don´t understand and it´s about the work performed by the tension. ...
Friday, February 10, 2017 by Amy

Physics
At the gym, a woman lifts 40 kilograms of weights on the leg press machine. It takes her 0.5 seconds to raise the weights a vertical distance of 0.4 meters. How much power does the woman generate when lifting the weights? A) 180 watts B) 200 watts C) 320 watts D) 500 watts
Friday, February 10, 2017 by kek

Physics
In an inelastic collision, a steel ball of mass 200 g was hit hard into a large ball of dough of mass 700 g. The velocity of the steel ball was 25m/s. After the collision, the steel ball was stuck in the dough, and this combined system rolled for some time. What was the ...
Friday, February 10, 2017 by kek

Physics
A student makes ice cream using an old-fashioned hand-crank machine. He does 40 joules of work each time he turns the crank in a complete circle. The crank handle makes a circular path with a diameter of 0.5 meters. The student turns the crank at a rate of once every 1.6 ...
Friday, February 10, 2017 by kek

Physics
A wheel has a radius of 100 cm. How far (path length) in meters does a point on the circumference travel if the wheel is rotated through angles of (a) 30°, (b) 60 rad, (c) 60 rev, respectively?
Friday, February 10, 2017 by jack

Engineering Physics Opt B
9. The flywheel shown in Figure 14.8 may be considered to be a steel cylinder (density 7800 kg m−3) of outer radius 40 cm and depth 12 cm, but with the central section (of outer radius 18 cm) missing. a. Use this simplification to estimate its moment of inertia. Ignore the ...
Friday, February 10, 2017 by Shrish

physics
Lake Champlain, bordered by New York, Vermont, and Quebec, has a surface area of 1,126 km^2. If the energy (173 PJ) is provided by sunlight shining on the lake at an average rate of 200 W/m^2 but with only half that amount absorbed, how long will it take the lake to absorb the...
Thursday, February 9, 2017 by Joseph

Physics
A 30.0kg blcok is resting on a flat horizontal table. ON top of this block is resting a a 15.0kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 325N/m. The coefficient of kinetic friction between the lower ...
Thursday, February 9, 2017 by TI

Physics
A wrecking ball is swinging at just the right height so that the student can stand at the bottom of the trajectory (lowest point) and grab onto the ball to swing – something that is just way too tempting for this inquisitive student. In order to justify invading the ...
Thursday, February 9, 2017 by Amy

PHYSICS
A gun fires a shell at an angle of elevation of 30* with a velocity of 2000ms-1.(A)what is the range of the shell.
Thursday, February 9, 2017 by AFOLABI IDRIS.

Physics 202
An inquiring student that has a mass of 65.0 kg is watching a crane with a wrecking ball demolish a building next door. The wrecking ball is swinging parallel to the property fence between her house and the neighbor’s. In an effort to estimate the length of the cable on the ...
Thursday, February 9, 2017 by Angela

PHYSICS
A lemming runs horizontally off the side of a 27.8 m cliff at 1.12 m/s. How long will it take for the lemming to hit the water? How far will it travel in the horizontal direction?
Thursday, February 9, 2017 by Jay

physics
A sign with a mass of (24) kg is hanging in two wires both making an angle of (52) degrees with the vertical. Find the tension in one of the wires. Give your answer in newtons (N) and with 3 significant figures.
Thursday, February 9, 2017 by dalia

Physics
Consider a child standing on a beach who gets hit by a wave. The child weighs 30 kg, and the portion of the wave that hits the child contained 60 kg water. If the wave had a period of 2 seconds and a wavelength of 6 meters, how fast will the child be moving after it is hit by ...
Thursday, February 9, 2017 by Ellie

physics
if someone throws a .1kg ball at the speed of -25m/s, why is the average net force positive instead of negative?
Thursday, February 9, 2017 by homework

physics
a bird flies 3km west and then 4km south. find the resultant displacement of the bird
Thursday, February 9, 2017 by Holly

physics
a cyclist travels 2.5km east, then 10km south and finally 5km west. determine the cyclist's overall displacement from their starting point.
Thursday, February 9, 2017 by Holly

Physics
A 15.0 gram bullet with a speed of v is fired into a 400 gram block of wood that is initially at rest on a surface. The coefficient of kinetic friction between the block and the surface is 0.250. The block of wood is attached to a horizontal massless spring with a spring ...
Wednesday, February 8, 2017 by Claire

Physics
A boat starting on one side of the river heads to the south with a speed of 1.5 m/s, the river flows to the east at .8 m/s. What is the resultant velocity to the side of the river? And if the river is 50 m wide calculate the displacement of the boat
Wednesday, February 8, 2017 by Anonymous

Physics
3 identical point charges Q are placed at the vertices of equilateral triangle (length of each side is equal to 2m) if Q=60uC, what is the magnitude of Electrostatic force on any one of the charges.
Wednesday, February 8, 2017 by chris

physics
If 32s is required for an object to reach maximum height, what will be the time for an object to come back to its initial position a. 32s b. -32s c. 64s d. 16
Wednesday, February 8, 2017 by taroon

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