Tuesday
December 6, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
If C⃗ = -5 i^ - 3 j^ - 4 k^, what is C⃗ × j^? If = -5 - 3 - 4 , what is × ?
Wednesday, September 21, 2016 by Brian

Physics
What is the airspeed relative to the ground of an airplane with an airspeed of 120km/h when it is in a 90-km/h crosswind?
Wednesday, September 21, 2016 by Samantha

Physics
The system starts at rest. A mass of 20kg (m1) is connected to a pulley of uniform mass m=5kg and radius 10cm and a mass of 30kg (m2) hangs on the other side of the pulley hanging 2m above the ledge Find the tension of the strings I tried to find the acceleration by finding ...
Wednesday, September 21, 2016 by Maddi

Physics
A 70kg wannabe stuntman at the edge of a roof top jumps vertical up with a speed of 4m/s and falls on a trampoline 2meters below where he started. If the trampoline acts like a Hooke's spring and does a maximum extension of 0.284m going down towards ground, what is the ...
Wednesday, September 21, 2016 by Veronica

Physics
a solid of density 2700 kg/m³ and volume 0.0015 m³ is completely immersed in alcohol of density 800kg/m³.Calculate: 1) weight on solid in SI system 2) upthrust on solid in SI system 3) apparent weight of solid in alcohol 4) will the apparent weight of solid be ...
Wednesday, September 21, 2016 by Khushi

physics
A joggler throws an apple vertically upward just enough to reach the ceiling exactly 4 meters from the jogglers hand . What is the initial velocity of the apple ?
Wednesday, September 21, 2016 by please help

Physics
A racing car of mass 850 kg accelerates from 20 km/h to 160 km/h over a distance of 300 metres. Frictional forces and wind resistance can be assumed to be 800N. Determine the following: (i)The average acceleration (ii)The time taken to accelerate from 20 km/h to 160 km/h (iii)...
Wednesday, September 21, 2016 by J.Kruger

Physics
A vehicle of mass 1200 kg accelerates uniformly from rest to a velocity of 15 m/s in 5 seconds. It continues at this velocity for 15 seconds before decelerating uniformly at a rate of 5m/s2 to rest. Determine the following: (i)The acceleration (ii)The time taken to decelerate ...
Wednesday, September 21, 2016 by J.Kruger

physics
if mass is not an issue then how much force is required to move a ten no. 'shake flashlight' .will it be equal to move a single flashlight or will have to work ten times more to shake these ten flashlights? Note these flashlights are based on magnetic induction
Wednesday, September 21, 2016 by vikram

physics
an object of height 5cm is placed 20cm in front of a concave mirror of radius of curvature 20cm by graphical method, find image distance from the mirror
Wednesday, September 21, 2016 by mark

physics
a baseball is batted with a speed of 120 ft/sec at an angle of 37 degrees with the ground. find how long the ball is in the air, how high the ball goes, how far from the plate it is caught, and the components of the velocity of the ball 4 sec after it is hit.
Wednesday, September 21, 2016 by kim

mathematical physics
For a scaler field ϕ(x, y, z) = x^n+y^n+z^n, show that (🔻ϕ ).r = nϕ , where n is a non-zero real constant.
Wednesday, September 21, 2016 by gourav bhardwaj

mathematical physics
A metal sheet has ,on the average , 5 defects per 1.0 m^2. Assuming a poisson distribution , calculate the probability that a 1.5 m^2 piece of the metal sheet will have at least 4 defects.
Wednesday, September 21, 2016 by gourav bhardwaj

physics
A car is traveling along a straight road at a velocity of +35.1 m/s when its engine cuts out. For the next 1.95 seconds, the car slows down, and its average acceleration is . For the next 6.52 seconds, the car slows down further, and its average acceleration is . The velocity ...
Tuesday, September 20, 2016 by Tamara

AP physics
A student preformed a sphere drop experiment from 1.50m above ground and the sphere has a mass of 0.875kg. Free fall times for the students experiment are below. Calculate the average acceleration due to gravity from the students data. Free fall times (s) 0.553 0.700 0.557 0....
Tuesday, September 20, 2016 by Susana

Physics
A car traveling in a straight line has a velocity of 3.7 m/s at some instant. After 7.99 s, its velocity is 12.2 m/s. What is its average acceleration in this time interval? Answer in units of m/s 2
Tuesday, September 20, 2016 by Ari

Physics
Initially (at time t = 0) a particle is moving vertically at 7.2 m/s and horizontally at 0 m/s. Its horizontal acceleration is 1.3 m/s 2 . At what time will the particle be traveling at 59◦ with respect to the horizontal? The acceleration due to gravity is 9.8 m/s 2 . ...
Tuesday, September 20, 2016 by Nicole

Physics
A car accelerates uniformly in a straight line from rest at the rate of 3.6 m/s2 . What is the speed of the car after it has traveled 61 m? Answer in units of m/s
Tuesday, September 20, 2016 by Ari

AP physics
Galileo carried out his seminal free-fall experiment using and incline plane. Why is such and approach feasible,and sometimes preferable to the simple drop meathod, for determining g?
Tuesday, September 20, 2016 by Susana

physics
A person takes a trip, driving with a constant speed of 99.5 km/h, except for a 24.0-min rest stop. The person's average speed is 66.4 km/h. how far does the person travel?
Tuesday, September 20, 2016 by keana dallas

Physics
If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative?
Tuesday, September 20, 2016 by Haaris

Physics
A=vf-vi÷t
Tuesday, September 20, 2016 by Messiah

Physics
A ball is rolling on a table with a horizontal velocity of 5 m/s when it rolls off the edge. How far from the base of the table does the ball land in the table is 0.8 m tall?
Tuesday, September 20, 2016 by Ryan

physics
Two particles A and B of respective masses M(B) and M(A) are connected together by means of an inextensible string of negligible mass. The string passes over the groove of a pulley of negligible mass. At instant to=0 the system S(pulley,mass,string) is left without initial ...
Tuesday, September 20, 2016 by vicky

physics
A particle C can move along a slide placed in a vertical plane. Points A and B are at the same horizontal level. Determine with respect to B the point where the velocity of C is zero for the first time in the three following cases: a) C is released from A without initial ...
Tuesday, September 20, 2016 by vicky

Physics
A Dare daredevil wants to jump his motorcycle across a 50 m Canyon a) If his speed is 30m/s and a ramp angle is 50 degrees where should the landing ramp be placed? b) With the same ramp what initial speed should he have if the landing ramp is 10 m from the far edge
Monday, September 19, 2016 by Vanessa

Physics
A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.70 of her regular weight. 1).Calculate the magnitude of the acceleration of the elevator. Express your answer to two significant figures and include ...
Monday, September 19, 2016 by Alex

physics
As two trains move along a track, their conductors suddenly notice that they are headed toward each other. The figure gives their velocities v as functions of time t as the conductors slow the trains. The figure's vertical scaling is set by vs = 40.0 m/s. The slowing ...
Monday, September 19, 2016 by fotran God

physics
A car accelerates uniformly in a straight line from rest at the rate of 3.9 m/s2 . What is the speed of the car after it has traveled 56 m? Answer in units of m/s.
Monday, September 19, 2016 by haven

physics
A flowerpot falls from a window sill 27.7 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s.
Monday, September 19, 2016 by haven

physics
An electric vehicle starts from rest and accelerates at a rate of 2.3 m/s2 in a straight line until it reaches a speed of 24 m/s. The vehicle then slows at a constant rate of 1.5 m/s2 until it stops. (a) How much time elapses from start to stop? (b) How far does the vehicle ...
Monday, September 19, 2016 by fotran God

Physics
A ball thrown horizontally from a point 26.0 m above the ground strikes the ground after travelling a horizontal distance of 23.0 m. With what speed was it thrown? Which equation should I use? V= DeltaX / Delta T A= Delta V / Delta T Horizontal motion where X= Xo + Vx(T)
Monday, September 19, 2016 by Bex

Physics
Sam and Terry find a 30.0 m deep wishing well and decide to make a wish. Terry throws a penny down the well at 3.00 m/s and Sam throws a penny up in the air at the same speed. If they threw them at the same time, how much time would there be between splashes?
Monday, September 19, 2016 by Fred

Physics
Joseph drives his car 10 km [E20 °S] then 25 km[N]. What is his total displacement?
Monday, September 19, 2016 by Kinematics

Physics
Tiffany throws a ball with a velocity of 5 m/s. As soon as it leaves her hand, the ball makes an angle of 30 ° with the ground. What are the x and y components of the velocity of the ball?
Monday, September 19, 2016 by Kinematics

physics
A capacitor with a capacitance of C = 25.7 μF is slowly charged by a constant current of I = 45.7 nA. How long does it take to charge the capacitor to a voltage of V = 29.4 V?
Monday, September 19, 2016 by andrea

physics
Two ropes are pulling upward on a large crate. The weight of the crate is 458 N. The tension in the left rope is the same as the tension in the right rope.If the crate is accelerating upward at a rate of 1.95 m/s2, and the tension in the two ropes is the same, what is the ...
Monday, September 19, 2016 by taylor

physics
a bullet of mass 20 gram is horizontly fired with a velocity 150 mtr/sec from a pistol of mass 2 kg. what is the recoil velocity of the pistol?
Monday, September 19, 2016 by geethika

physics
A particle B of mass 10g is shot vertically upward from a point O with velocity 10m/s. The horizontal plane containing O is the reference level of the gravitational potential energy .Neglect all air effects. a) Calculate the mechanical energy of the system at O. b) Calculate ...
Monday, September 19, 2016 by angie

Physics
A tennis player hits a ball 1.6m above the ground. The ball leaves the racket with a speed of 12m/s at an angle 8.0 above the horizontal. The net is a horizontal distance of 7.0m away from the player and is 1.0m high. a) does the ball clear the net? Explain how you determined ...
Monday, September 19, 2016 by Brittany

physics
A puck is released on an air table inclined by 0.1rd with respect to horizontal. By applying the principle of conservation of the mechanical energy of the system ,calculate the velocity of the puck after 40 cm journey along a line of greatest slope.
Monday, September 19, 2016 by angy

Physics
A 10-ft,25lb seesaw is balanced by a little girl with a weight of 50lbs and her father with a weight of 200lbs at opposite ends. How far from the seesaw's center of mass must the fulcrum be placed?
Monday, September 19, 2016 by Hana

physics
A particle B of mass 10g is shot vertically upward from a point O with velocity 10m/s. The horizontal plane containing O is the reference level of the gravitational potential energy .Neglect all air effects. a) Calculate the mechanical energy of the system at O. b) Calculate ...
Monday, September 19, 2016 by angy

Physics
A rocket accelerates upward at 3m/sec2 for 60 seconds when it releases a booster. How long will it take the booster to reach the ground from the highest point and what is its velocity as it is striking the ground? I'm unsure how to find the time if time is already given. I...
Monday, September 19, 2016 by john

physics
A homologous rod of mass M=20kg of length L=3m and of negligible cross-section rests initially on the horizontal ground chosen as a reference level for the gravitational potential energy. The rod is rotated about one end until it takes a vertical position . Calculate the ...
Monday, September 19, 2016 by angy

physics
a glass block weighs 25N in air . when whole immersed in water, the block weighs 15N. calculate the relative density of glass
Monday, September 19, 2016 by zari

Physics
If a ball is dropped from a height of 100.0 m, what is it's height above the ground (in meters) after 3.0 s? If a ball is dropped from a height of 100.0 m, what is it's velocity (in m/s) after 3.00 s? You may treat downward velocity as positive.
Sunday, September 18, 2016 by Brad

Physics
If a ball is launched straight upwards from the ground with an initial velocity of 20.0 m/s, how long does the ball take to reach a height of 15.0 m on the way up? For the same situation, at what time does the ball reach 15.0 m on the way back down?
Sunday, September 18, 2016 by Chad

Physics
If you apply a changing force, will either the velocity or the acceleration change in the same way as the force?
Sunday, September 18, 2016 by Jane

physics
On a banked race track, the smallest circular path on which cars can move has a radius of 101 m, while the largest has a radius of 163 m, as the drawing illustrates. The height of the outer wall is 19.0 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
Sunday, September 18, 2016 by xavier

physics
A WEATHER BALLOON IS TO OPERATE WHERE THE DENSITY OF AIR IS 0.9Kg/m3. THE BALLOON HAS A VOLUME OF 20cm3 AND IS FILLED WITH NITROGEN WITH DENSITY 0.09Kg/m3. IF THE BALLOON BAG WEIGHS 118N, WHAT LOAD CAN IT SUPPORT AT THIS ALTITUDE?
Sunday, September 18, 2016 by cho

Physics
The Earth is about 81 times more massive than the moon. During the gravitational interation of the Earth and the Moon, the magnitude of the gravitational force acting on the Earth _______ the gravitational force acting on the Moon. A) is greater than B) is less than C) is the ...
Sunday, September 18, 2016 by Anonymous

PHYSICS
Two objects are tied together and placed on a frictionless table. One is pushed off the edge of the table so it falls, dragging the second along the surface of the table. The magnitude of the acceleration of the falling object is _______.
Sunday, September 18, 2016 by Anonymous

physics
A public transportation bus travels back and forth along a road, following the position-time graph over the time period shown below. There are five points labeled on the graph. What is the average speed and velocity (magnitude and direction) of the bus between point 1 and ...
Sunday, September 18, 2016 by jake

physics
In Mud buggy driving, people attempt to drive an off-road vehicle over a deep mud puddle. If the buggy stops before the end , it sinks into the mud and needs to be pulled out with a tow truck. A racer is driving his mud buggy in a straight line. when he hits the edge of the ...
Sunday, September 18, 2016 by Matt

physics
In Mud buggy driving, people attempt to drive an off-road vehicle over a deep mud puddle. If the buggy stops before the end , it sinks into the mud and needs to be pulled out with a tow truck. A racer is driving his mud buggy in a straight line. when he hits the edge of the ...
Sunday, September 18, 2016 by Matt

Physics
A person takes a trip, driving with a constant speed of 94.0 km/h except for a 22.0 min rest stop. If the person's average speed is 60.1 km/h, how much time is spent on the trip and how far does the person travel?
Sunday, September 18, 2016 by Jared

Physics
A 20 kg block is placed on a 35 degree ramp. What is its true metric weight?
Sunday, September 18, 2016 by Kori

Physics
In mud buggy driving, people attempt to drive an off road vehicle over a deep mud puddle. If the buggy stops before the end, it sinks into the mud and needs to be pulled out with a tow truck. A racer is driving his mud buggy in a straight line . when he hits the edge of the ...
Sunday, September 18, 2016 by Gerard

Physics
In mud buggy driving, people attempt to drive an off road vehicle over a deep mud puddle. If the buggy stops before the end, it sinks into the mud and needs to be pulled out with a tow truck. A racer is driving his mud buggy in a straight line . when he hits the edge of the ...
Sunday, September 18, 2016 by Geo

Physics
Starting from rest at 10m to the left of the origin (the starting line of a race), a go-kart undergoes constant acceleration of 2.46 m/s2. Make a table calculating the karts position and velocity at 10 second intervals from t=0 to 60 seconds. I have created the table but I ...
Sunday, September 18, 2016 by Jorge

Physics
A truck of mass 2 tonnes moving at a speed of 25 m/s is brought to rest suddenly in 5 seconds. Calculate the power exerted by the brakes
Sunday, September 18, 2016 by Muomen

mathematical physics
An unbiased coin is tossed three times. If A is the event that a head appears on each of the first two tosses,B is the event that a tail occurs on the third toss and C is the event that exactly two tails appear in the three tosses,show that: i) Events A and B are independent. ...
Sunday, September 18, 2016 by gourav bhardwaj

Physics
A student walking home at a steady rate of 4.80 m/s suddenly decides to start running. She can accelerate at 7.50 m/s22, and runs for 1.70 s before stopping. What distance did the student cover while running?
Sunday, September 18, 2016 by Ann

Physics
A rock perched on the edge of a cliff falls off.  It starts from rest, and falls freely for 1.48 seconds before reaching the ground at the base of the cliff.   What is the speed of the stone just before it hits the ground?
Sunday, September 18, 2016 by Tara

Physics
A diver jumps off of a diving board.  She leaves the board with a velocity of 3.70 m/sec in the upward direction.  How far will she rise above the diving board before she reverses her motion and starts to fall downward?
Sunday, September 18, 2016 by Tara

Physics
A skydiver is falling to earth.  When he is traveling at 51.3 m/sec, he opens his parachute, and after 3.00 seconds he reaches the speed of 4.30 m/sec.  The remaining 60 seconds before landing is spent traveling downward at the speed of 4.30 m/sec.  What is his ...
Sunday, September 18, 2016 by Tara

physics
Calculate the resultant force when four forces of 30N due east 20N due north 50N due West and 40N due south are acted upon a body
Sunday, September 18, 2016 by Suraj

physics
23. Two identical balls each have an excess charge of 5.0 x 10-7 C, and they are attached to the ceiling by light string 0.80 m long as shown in the figure below. If the angle that the threads make with respect to each other is 300, determine the force experienced by each ball...
Sunday, September 18, 2016 by christian

physics
A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power. If the cost of electricity is 12 cents per kWh, how much does it cost to heat the dinner?
Sunday, September 18, 2016 by kim

physics
A microwave oven has a power requirement of 1250 W. A frozen dinner requires 6.5 min to heat on full power. How much electrical energy (in kWh) is used?
Sunday, September 18, 2016 by kim

physics
How much heat is necessary to change 345 g of ice at -11°C to water at 20°C
Sunday, September 18, 2016 by kim

physics
While in Europe, a tourist hears on the radio that the temperature that day will reach a high of 22°C. What is this temperature on the Fahrenheit scale?
Sunday, September 18, 2016 by kim

physics
The energy released by a heater which draws a current of 5A at 220V for 1min. E ~ V × I× t( hrs)÷1000 220×5×0.0167÷60000 Is equal to 0.00030 Kwh
Sunday, September 18, 2016 by lhamo

physics
How much heat is necessary to change 345 g of ice at -11°C to water at 20°C?
Sunday, September 18, 2016 by kim

physics
A 4.6 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.45 m above the counter
Sunday, September 18, 2016 by kim

PHYSICS
In an archery practice an arrow was realesed from a bow with a velocity of 20m/s it strikes and slopes find at what rate the aarrow was aaccelarated
Sunday, September 18, 2016 by physics

mathematical physics
Using Green's Theorem evaluate the integral ∮c(xydx + x^2y^2 dy) where C is the triangle with vertices (0 ,0), (1, 0) and (1, 2).
Sunday, September 18, 2016 by gourav bhardwaj

mathematical physics
Using Stokes' theorem evaluate ∫c F.dl where F = yi^+ xz^3 j^-z y^3 k^ and C is the circle x^2+ y^2 = 4; z = -3.
Sunday, September 18, 2016 by gourav bhardwaj

PHYSICS
What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?
Sunday, September 18, 2016 by Anonymous

physics
What is the acceleration of a 10-N freely falling object with no air resistance?
Sunday, September 18, 2016 by lisa

Physics
An automobile accelerates 1.77 m/s2 over 6.00 s to reach freeway speed at the end of the entrance ramp. If the car's final velocity is 24.44 m/s, what is it's initial speed when it began accelerating. the answer i got was 35.06 m/s (35.1 m/s when doing sig figs). I ...
Saturday, September 17, 2016 by John

Physics
One positive aspect of the potential use of methane hydrate as a fuel is that A.it exists in a pure form ready for use B.there is more of it than there is coal, oil, and natural gas C.it use will never contribute to global warming D.it is easy to mine
Saturday, September 17, 2016 by Destiny

Physics
A bean jumps vertically off of a table. It has a speed of 10 m/s when it reaches half of its maximum height. How high does it rise?
Saturday, September 17, 2016 by Jack

Physics
A bean jumps off a table and when it reaches have its height it has a speed of 10 m/s, how high does it rise?
Saturday, September 17, 2016 by Jack

physics
A vertical spring stretches 13 cm when a 2.3 kg block is hung from its end. (a) Calculate the spring constant. This block is then displaced an additional 3.2 cm downward and released from rest. Find the (b) period, (c) frequency, (d) amplitude, and (e) maximum speed of the ...
Saturday, September 17, 2016 by Mariaaaaaaa

Physics
A ball is rolled up a ramp with an initial velocity of +10m/s. It arrives at the bottom of the ramp with the same speed 5 seconds later. What is the ball acceleration for the whole trip? What is the velocity after 2 seconds? After 3 seconds?
Saturday, September 17, 2016 by Koko

Physics (Mechanics)
A bat makes contact with a ball 0.8 meters above the ground. The ball then travels with a speed of 22 m/s, moving up. How high does it go?
Saturday, September 17, 2016 by Andrew

AP physics
Can two vectors, of unequal magnitude, add up to give the zero vector? Can three unequal vectors? Under what condition?
Saturday, September 17, 2016 by Susana

physics
How much work is required to lift a 5.2-kg concrete block to a height of 3.1 m?
Saturday, September 17, 2016 by kim

physics
What is the kinetic energy of a 15 kg dog that is running at a speed of 8.7 m/s (about 19 mi/h)?
Saturday, September 17, 2016 by kim

physics
A 4.6 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.45 m above the counter?
Saturday, September 17, 2016 by kim

physics
While rearranging a dorm room, a student does 307 J of work in moving a desk 1.1 m. What was the magnitude of the applied horizontal force?
Saturday, September 17, 2016 by kim

Physics
You take 4 measurements of the mass of a ball: 2.96 kg, 3.32 kg, 3.31 kg, 3.17 kg. What is the uncertainty of the average mass to 95% confidence? CL=95% N=4 CC=1.84
Saturday, September 17, 2016 by Gabriel

Physics
Physics teacher has this question for hw. 38. An electric powered model car starts from rest and moves in a straight-line for 4.0 s. The relationship between time and position is x^2+ 2 t^2 = 32, t in seconds and x in cm. Find the velocity at t= 1 s & t = 3 s. he gave us the ...
Saturday, September 17, 2016 by Eric

physics
You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 4.40 m above the trampoline directly below, so it is perfect for viewing the the facility. Occasionally ...
Saturday, September 17, 2016 by p

Physics
A turtle ambles leisurely–as turtles tend to do–when it moves from a location with position vector r1,x = 1.49 m and r1,y = -2.83 m in a lettuce garden to another location, with position vector r2,x = 3.17 m and r2,y = -4.49 m, where the lettuce appears to be tastier...
Saturday, September 17, 2016 by Chisom

Physics
Q.A ballon is asending at the rate of 5m/s at height of 98m above the ground, when a packet is dropped from the ballon. After how much time and with what velocity it will reach the ground.
Saturday, September 17, 2016 by Me

Physics
A person driving her car at 45km/h approaches an intersection just as the traffic light turns yellow. She knew that the yellow light lasts only 2s before turning red,and shi is 28m away from the near side of the intersection. Should she try to stop,or should she speed up to ...
Saturday, September 17, 2016 by Lee

Physics
An athlete performing a long jump leaves the ground at a 27.1 ∘ angle and lands 7.73 m away. 1). What was the takeoff speed? Express your answer using three significant figures and include the appropriate units. 2).If this speed were increased by just 3.0%, how much ...
Friday, September 16, 2016 by Ashley

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Homework Help: Science