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August 29, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing
Thursday, January 22, 2015 by Anonymous

Physics
In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.8m above the equilibrium position.What will be the vertical position of the boat 3.0s later?
Thursday, January 22, 2015 by Emma

physics 11
A 1000 kg car travelling at 25m/s south collides head-on with a 2250 kg car travelling at 10m/s in the opposite direction. They stick together after collision. Which way does the wreckage move? What is their final velocity?
Thursday, January 22, 2015 by Deep

Physics
What is the y-component of a vector in the x-y plane whose magnitude is 87.8 and whose x-component is 64.9?
Wednesday, January 21, 2015 by Tanner

Physics
I have a test tomorrow and I don't really understand this question, I was hoping somebody could help explain it? If 2.75x10¹⁹ electrons pass a point in a circuit in 30s, what is the current?
Wednesday, January 21, 2015 by Kyra

physics
A football is kicked at ground level with a speed of 15.4 m/s at an angle of 34.7° to the horizontal. How much later does it hit the ground? (in s)
Wednesday, January 21, 2015 by Tanner

Physics
Romeo is chucking pebbles gently up to Juliet's window and he wants the pebbles to hit the window with only a horizontal component of velocity (the least possible speed). He is standing at the edge of a rose garden at H = 4.62 m below her window and at D = 5.21 m from the ...
Wednesday, January 21, 2015 by Tanner

Physics
He is standing at the edge of a rose garden at H = 4.62 m below her window and at D = 5.21 m from the base of the wall. How fast are the pebbles going when they hit her window?
Wednesday, January 21, 2015 by Madison

physics
A diver running 1.89 m/s dives out horizontally from the edge of a vertical cliff and 2.88 s later reaches the water below. How high was the cliff. (in m)
Wednesday, January 21, 2015 by Madison

physics
A string that passes over a pulley has a 0.375 kg mass attached to one end and a 0.630 kg mass attached to the other end. The pulley, which is a disk of radius 9.50 cm, has friction in its axle. What is the magnitude of the frictional torque that must be exerted by the axle if...
Wednesday, January 21, 2015 by Johnathan

physics
A cat walks along a uniform plank that is 4.00 m long and has a mass of 7.00 kg. The plank is supported by two sawhorses, one 0.44 m from the left end of the board and the other 1.60 m from its right end. When the cat nears the right end, the plank just begins to tip. If the ...
Wednesday, January 21, 2015 by Johnathan

physics
The components of a vector V are often written (Vx, Vy, Vz). What is the x component of a vector which is the sum of the two vectors, V1 and V2, whose components are (3.27, 1.86, 0.00) and (3.85, -3.53, -1.43)?
Wednesday, January 21, 2015 by Madison

physics
A 10.7 kg bowling ball moves in a straight line at 4.26 m/s. How fast must a 2.55 g Ping-Pong ball move in a straight line so that the two balls have the same momentum?
Wednesday, January 21, 2015 by chris

physics
A person walks first at a constant speed of 5.10 m/s along a straight line from point circled A to point circled B and then back along the line from circled B to circled A at a constant speed of 3.15 m/s.(a) What is her average speed over the entire trip? How can I find the ...
Wednesday, January 21, 2015 by Leah

Physics
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5 m/s2 for 4.2 seconds. It then continues at a constant speed for 11.1 seconds, before applying the brakes such that the car...
Wednesday, January 21, 2015 by Isaiah

physics
Consider a thin spherical shell of radius 20.2cm with a total charge of 3.3μC distributed uniformly on its surface. a) Find the electric field, in N/C, at a radius of 15.6cm from the center of the charge distribution. b) Find the electric field, in N/C, at a radius of 27....
Wednesday, January 21, 2015 by Lauren

physics
A train whistle is heard at 280Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 270 Hz. What is the speed of the train before slowing down? What is the speed of the train after slowing down?
Wednesday, January 21, 2015 by henry

Physics
Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.41 m/s at 44.1° above the horizontal, sails through ...
Wednesday, January 21, 2015 by Blake

physics
The following charges are located inside a metallic container on unknown shape: 5.00 μC, -4.60 μC, 67.0 μC, and -50.0 μC. Calculate the net electric flux, in Nm2/C, through the container
Wednesday, January 21, 2015 by Lauren

physics
A proton is placed at rest in an electric field of 515 N/C. Calculate the speed of the proton 36.0 ns after being released
Wednesday, January 21, 2015 by Linda

physics
An object having a net charge of 18.2 μC is placed in a uniform electric field of 790 N/C directed vertically upward, i.e. in the direction opposite gravity. What is the mass, in grams, of this object if it "floats" in the field? (Assume g = 9.80 m/s2.)
Wednesday, January 21, 2015 by Serena

Physics
When will the resultant of the 5N and 7N be at a maximum?
Wednesday, January 21, 2015 by Owami

physics
Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
Wednesday, January 21, 2015 by Kareem

physics
A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?
Wednesday, January 21, 2015 by Kareem

physics
A lead ball of mass 60kg hangs from a string. A piece of putty mass of 15kg hits the ball with velocity of 12m/s. If the putty sticks to the ball, what will be their velocity immediately after the impact?
Wednesday, January 21, 2015 by Momentum

physics
5. An object is dropped. If one could neglect air resistance a. what would its velocity (magnitude and direction) be after 1 s? b. what would its displacement (magnitude and direction) be after 1 s?
Wednesday, January 21, 2015 by Anonymous

physics
You set your stationary bike on a high 80 N friction like resistive force and cycle for 30 min at speed of 8 m/s. Your body is 10% efficient at converting chemical energy in your body into mechanical work. What is your internal chemical energy change? How long must you bike to...
Tuesday, January 20, 2015 by bill

Physics
mrubber stopper = 0.07Kg mmetal washers = 0.196Kg radius = 1.0m total time = 12 seconds # of revolutions = 10 revolutions With this data, calculate the centripetal Force (Fc) (to 2 decimals) of the rubber stopper in its "orbit".
Tuesday, January 20, 2015 by Brooke

Physics
mass rubber stopper = 0.07Kg mass metal washers = 0.196Kg radius= 1.0m total time = 12 seconds # of revolutions = 10 revolutions With this data, calculate the Period (T) of the rubber stopper in its "orbit".
Tuesday, January 20, 2015 by Brooke

Physics
A 500 kg car experiences a frictional force of 3080 N while turning, if the car is traveling around a turn of radius 17 m what is the velocity of the car?
Tuesday, January 20, 2015 by Brooke

physics
The curves on a race track are banked to make it easier for cars to go around the curves at high speed. Draw a free-body diagram of a car on a banked curve. From the motion diagram, find the direction of the acceleration. The acceleration is directed toward the center of the ...
Tuesday, January 20, 2015 by mathew

Physics
how much work is needed to stop a 20kg bullet moving with a speed of 150m/s?
Tuesday, January 20, 2015 by Hart

Physics
A motorcycle has a mass of 250kg. It goes around a 13.7 m radius turn at 96.5 km/hr. What is the centripetal force? a. 2.95x10^3 N b. 4.31x10^4N c. 1.31x10^4 N d. 719N
Tuesday, January 20, 2015 by Brooke

physics
A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose? P=W/t=Fd/t=mgd/t (30)(9.8)(20)/1= 5880 W is that right?
Tuesday, January 20, 2015 by bill

Physics
A child swings from a rope of length L. If she starts her swing with the rope horizontal what is her acceleration at the bottom of the swing? a. 2gL^2 b. g/2 c. g d. 2g/l e. 2g
Tuesday, January 20, 2015 by Brooke

Physics
Abby is swinging a ball on a string in a circle with a constant tension. Which of the following quantities is constant? a. acceleration b. speed c. none of the others d. velocity e. force
Tuesday, January 20, 2015 by Brooke

Physics
A point on a wheel rotating at 5revs/s is located 0.20m away from the axis. What is the centripetal acceleration? a. 198m/s^2 b. .05m/s^2 c. 48m/s^2 d. 1.35m/s^2
Tuesday, January 20, 2015 by Brooke

physics
In a physics lab, students are asked to predict how the acceleration of the block sliding up a ramp compares to the acceleration down the ramp compares to the acceleration down the ramp. The block slides up a somewhat rough surface inclined at an angle of theta above the ...
Tuesday, January 20, 2015 by Anonymous

Physics
The position of a point A is specified as A (5.7).the y-coordinate is ?
Tuesday, January 20, 2015 by Emmanuel

physics
Light is incident from air onto a flat transparent slab of material, at an angle of 62.2° with the normal. The reflected ray and the refracted ray are perpendicular to each other. What is the index of refraction of the transparent substance?
Tuesday, January 20, 2015 by Ted

physics
The standard piece of apparatus used to measure distance in the laboratory is what?
Tuesday, January 20, 2015 by Emmanuel

physics
The S.I. Unit of displacement is what?
Tuesday, January 20, 2015 by Emmanuel

physics
When a ball is thrown upward, it experiences a downward accelera- tion of magnitude 9.8 m/s 2 , neglecting air resistance. With what velocity must a ball leave a thrower’s hand in order to climb for 2.2 s before stopping?
Tuesday, January 20, 2015 by Anonymous

physics
If a car crashes into a wall, the wall puts force on the car. The car puts an equal force on the wall. What does each force do?
Tuesday, January 20, 2015 by Anonymous

Physics 152
I was able to come up with the answers through trial and error, and the answer for the charge +q makes sense, but I don't understand why the answer for the -q is correct. Please help. A positive point charge +q1, a second point charge q2 that may be positive or negative, ...
Tuesday, January 20, 2015 by Dan

physics
Two small beads having positive charges q1 = 34.0 nC and q2 = 55.0 nC are fixed so that the centers of the two beads are separated by a distance d = 0.450 m as shown in the figure. At what position x relative to q1 could you place a third small bead of unknown charge q in ...
Tuesday, January 20, 2015 by Linda

physics
a student is helping her teacher move a 9.5 kg box of books what net sideways force must she exert on the box the slide it across so that it accelerates at 1.0 m/s2
Tuesday, January 20, 2015 by Joshua Bennet

Physics
Calculate the magnitude of the linear momen- tum for each of the following cases a) a proton with mass 1.67 × 10−27 kg mov- ing with a velocity of 6 × 106 m/s. Answer in units of kg · m/s.
Monday, January 19, 2015 by Chris

Physics
Calculate the magnitude of the linear momen- tum for each of the following casesEarth (m = 5.98 × 1024 kg) moving with an orbital speed equal to 26200 m/s. Answer in units of kg · m/s.
Monday, January 19, 2015 by Chris

Physics
A railroad car with a mass of 2.33 × 104 kg moving at 3.71 m/s collides and joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.44 m/s.What is the final speed of the three joined ...
Monday, January 19, 2015 by Chris

physics please help
the potential difference across a load is 9V. explain what this means in more fundamental terms.
Monday, January 19, 2015 by Isabelle

physics
Shawn and his bike have a total mass of 57.1 kg. Shawn rides his bike 1.3 km in 14 min at a constant velocity. The acceleration of gravity is 9.8 m/s 2 . What is Shawn’s kinetic energy?
Monday, January 19, 2015 by anthony

physics
A particle of charge +18.1C and mass 7.06 × 10-5 kg is released from rest in a region where there is a constant electric field of +414 N/C. What is the displacement of the particle after a time of 3.06 × 10-2 s? Please explain the steps, thank you.
Monday, January 19, 2015 by S

Physics
A particle moves along the x axis. Its position is given by the equation x = 2.00 + 3.20t - 3.85 t2 with x in meters and t in seconds. Determine its position at the instant it changes direction. (in m)
Monday, January 19, 2015 by Madison

Physics
A speedboat moving at 29 m/s approaches a no-wake buoy marker 98.3 m ahead. The pilot slows the boat with a constant acceleration of -3.61 m/s2 by reducing the throttle. How long does it take the boat to reach the buoy? (in s)
Monday, January 19, 2015 by Madison

physics
The 80kg student balances a 1300kg elephant on a hydraulic lift. (U-Tube) What is the diameter of the piston the student is standing on? When a second student joins the first, the height difference between the liquid levels in the right and left pistons is 40cm . What is the ...
Monday, January 19, 2015 by Pat

Physics
Negating air resistance, a block weighing 1.0 kg will fall _________ a 3.0 kg block Answer: The same rate as
Monday, January 19, 2015 by Lucina

physics
A car (mass = 750 kg) is initially moving with velocity 30 m/s. The driver slowly presses on the brakes and bring the car to a stop, traveling 50 m in the process. Calculate the force of friction between the car and the ground that brings it to a stop. Draw a free-body diagram...
Monday, January 19, 2015 by Cassie

Physics
A driver in a car traveling at a speed of 56.1 mi/h sees a deer 103 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime). (in m/s^2)
Monday, January 19, 2015 by Madison

Physics
A stone is dropped from the top of a cliff. It hits the ground below after 3.12 s. How high is the cliff? (in m)
Monday, January 19, 2015 by Madison

Physics
In coming to a stop, a car leaves skid marks 97.0 m long on the highway. Assuming a deceleration of 6.60 m/s2, estimate the speed of the car just before braking. (in m/s)
Monday, January 19, 2015 by Madison

Physics
At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s)
Monday, January 19, 2015 by Madison

Physics
A 100N force acting on a lever 2m from the fulcrum balances an object 0.5m from the fulcrum on the other arm. What is the weight of the object(in newtons)?What is it's mass (in kg)?
Monday, January 19, 2015 by Jessica

physics
A 30.0 kg block falls from a height of 30,4 m. assuming a closed system its speed just before hitting the ground is about?
Monday, January 19, 2015 by Cherri

physics
A truck travels 1710 m uphill along a road that makes a constant angle of 5 . 08 ◦ with the horizontal. Find the magnitude of the truck’s horizontal component of displacement. Answer in units of m.
Monday, January 19, 2015 by allan

physics
A submarine dives 196.0 m at an angle of 18.0 ◦ below the horizontal. What is the horizontal component of the submarine’s displacement? Use the coordi- nate system where positive x is to the right and positive y is up. Answer in units of m.
Monday, January 19, 2015 by allan

physics
A 18 kg block is dragged over a rough, hor- izontal surface by a constant force of 131 N acting at an angle of 27 ◦ above the horizon- tal. The block is displaced 15 . 7 m, and the coefficient of kinetic friction is 0 . 125. The acceleration of gravity is 9 . 8 m / s 2 ....
Monday, January 19, 2015 by allan

Physics/Math
Determine the missing value. a) Output value/Efficiency: 100 J Efficiency: 100% Input E = ??? b) Input: 100 J Efficiency: 30% Output E = ?? Output= 30 J c) Output E: 120 000 J Efficiency: 2% Input E= ?? How would I solve for the put value? Thank you!
Monday, January 19, 2015 by Lucina

physics
Consider two vectors ~ A and ~ B and their re- sultant ~ A + ~ B . The magnitudes of the vectors ~ A and ~ B are, respectively, 13 . 2 and 6 . 1 and they act at 110 ◦ to each other.Find the magnitude of the resultant vector ~ A + ~ B .
Monday, January 19, 2015 by allan

physics
if resultant of two forces when they act at an angle of 30 deg is 50N and when they act at 60 deg the resultant is 70N find magnitude of two forces
Monday, January 19, 2015 by ajay

Physics
A 50 g lunch pail is lifted up 500 m. If the work required to do this was 1450 J, what's the acceleration? W= mad 1450 = (0.05 kg)(a)(500m) 1450 = 250a 5.8 m/s^2 = a If a 750 g mass is accelerated at a rate of 11.0 m/s^2 for a distance of 3.0 m, how much work was done? W...
Sunday, January 18, 2015 by Lucina

physics
You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
Sunday, January 18, 2015 by Anonymous

Physics
A old Chevy accelerates at a rate of 3.8 m/s^2. How much time would it take to reach the speed limit of 100 km if the car was travelling at the speed of 70.0 km? a) 2.9 s b) 3.7 s <---- c) 5.4 s d) 30.0 s 2. Find the acceleration of a skier sliding down a mountain at a rate...
Sunday, January 18, 2015 by Lucina

physics
A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
Sunday, January 18, 2015 by Anonymous

physics
Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
Sunday, January 18, 2015 by Anonymous

physics
You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.8s accelerating your board at 0.49m/s2 at a 35∘ to your original direction. 1. Find the magnitude of your displacement during the gust. Express your answer using two significant figures. 2. Find direction...
Sunday, January 18, 2015 by Anonymous

physics
An object is moving in the x-direction at 1.1m/s when it undergoes an acceleration a⃗ =0.56j^m/s2. Find its velocity vector after 4.8s . Express your answer as a comma-separated pair of components. Express your answer using two significant figures
Sunday, January 18, 2015 by Anonymous

Physics
A cannon is fired at 30 degrees above the horizontal with a velocity of 200 m/s from the edge of a 125 m high cliff. Calculate where the cannonball lands on the level plain below.
Sunday, January 18, 2015 by Sean

Physics
The earth has about 80 times the mass of the earth’s moon. The gravitational force exerted on the moon by the earth has what relation to the gravitational force exerted on the earth by the moon? 1. the same as 2. zero; the earth exerts a force on the moon,but the moon is ...
Sunday, January 18, 2015 by Tiffany

physics
A block of mass 10kg is pulled horizontally by a force of 75N that makes an angle of 37° to the horizontal whose coefficient of friction is 0.4 . what is the acceleration of the block
Sunday, January 18, 2015 by Eyosias

physics
A car, initially going eastward, rounds a 90 ∘ curve and ends up heading southward. If the speedometer reading remains constant, what is the direction of the car's average acceleration vector? Express your answer using three significant figures.
Sunday, January 18, 2015 by Anonymous

physics
Write an expression for a unit vector at 45∘ clockwise from the x-axis. Express your answer in terms of the unit vectors i^ and j^.
Sunday, January 18, 2015 by Anonymous

physics
A model rocket is launched straight upward. Its altitude y as a function of time is given by y=bt−ct2, where b = 80m/s , c = 4.9m/s2 , t is the time in seconds, and y is in meters. 1. Use differentiation to find a general expression for the rocket's velocity as a ...
Sunday, January 18, 2015 by Anonymous

Physics II
A large cylindrical water tank 11.5 m in diameter and 13.5 m tall is supported 8.75 m above the ground by a stand. The water level in the tank is 10.6 m deep. The density of the water in the tank is 1.00 g/cm3. A very small hole is formed at the base of the vertical wall of ...
Sunday, January 18, 2015 by Lindsay

Physics
An automobile travels a distance of 12 km in 4 minutes. It then moves the next 12 km in 2 minutes. Please help me to calculate its acceleration which is constant throughout the motion. Thanks in advance ))))
Sunday, January 18, 2015 by Aiko

Physics
the coefficient of friction between block A and the horizontal surface is 0.43. What must be the weight of teh hanging block B if this block is to descend at constant speed once it has been set into motion? Mass of block A is 5.0 kg
Sunday, January 18, 2015 by Anonymous

physics
As a warm-up for their juggling act, two clowns are tossing balls straight up in the air and catching them. While following the balls with his eyes, Joey says, ”Isn’t it strange how they just stand still in the air for a moment before they fall back down?” ”...
Sunday, January 18, 2015 by Angy

Physics
An oil spill on the ocean is sometimes modeled as having a velocity that has two components: a wind induced velocity that is 3% of the true wind velocity and an independent tidal velocity Vtidal. The tidal velocity is 3.0 km/hr due north and V wind = 40 km/hr 20 degrees north ...
Saturday, January 17, 2015 by zaya

physics
Mass M is initially sliding down the inclined plane with a velocity of V = 4 cm/sec as shown. The coefficient of kinetic friction is μK = 0.2. Angle of 70 degrees. Assuming the mass does not reach the base of the incline before one second has passed, answer the following...
Saturday, January 17, 2015 by zaya

Science
guys, please give me any ideas for a investigatory project in physics ???
Saturday, January 17, 2015 by Anonymous

Chemistry
Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!
Saturday, January 17, 2015 by Lucina

Physics
A car accelerates at a rate of 5m/s2 for a period of 4.2 seconds and then moves at a constant speed for 8 seconds more. How far did it travel?
Saturday, January 17, 2015 by Lisa

Calc Physics
The velocity as a function of time for an asteroid in the asteroid belt is given by v(t)= vo e^(-t/to)i + (vo t/ 2 to) j with vo and to constants. Use ti = 0 as the initial time, and tf = 472 s as the final time. The values for the constants that you will use are: vo = 9 m/s ...
Saturday, January 17, 2015 by Michelle

physics
Wayne exerts a force of 70.9 N to pull a 409 N sled along a snowy path using a rope that makes a 48◦ angle with the ground. The sled moves 19.9 m in 4.3 s. What is Wayne’s power? Answer in units of W. PLEASE HELP!
Saturday, January 17, 2015 by allan

physics
Wayne exerts a force of 70 . 9 N to pull a 409 N sled along a snowy path using a rope that makes a 48 ◦ angle with the ground. The sled moves 19 . 9 m in 4 . 3 s. What is Wayne’s power? Answer in units of W.
Saturday, January 17, 2015 by allan

physics
Samantha is 1.21 m tall on her eleventh birthday and 1.32 m tall on her twelfth birthday. By what factor has her height increased?
Saturday, January 17, 2015 by hellen

Physics
Two point charges q1 and q2 are held 4.00cm apart. An electron released at a point that is equidistant from both charges undergoes an initial acceleration of 9.00×10^18m/s^2 directly upward in the figure, parallel to the line connecting q1 and q2. See the figure: session...
Saturday, January 17, 2015 by Luciano

physics
Please someone should help me with this. An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is ?
Friday, January 16, 2015 by jake

Physics Class
A 0.140-kg baseball is pitched horizontally at 36.7 m/s. When a player hits the ball, it moves at the same speed, but in the opposite direction. If the bat and the ball are in contact for 0.450 ms, calculate the average force the bat exerts on the ball. Work Shown: F/\t0.450ms...
Friday, January 16, 2015 by JLW Physics

Physics
A boat crosses a river of width 115 m in which the current has a uniform speed of 1.84 m/s. The pilot maintains a bearing (i.e., the direction in which the boat points) perpendicular to the river and a throttle setting to give a constant speed of 1.1 m/s relative to the water...
Friday, January 16, 2015 by Maddie

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