# Physics

physics
On a 60 km track,a train travels the first 30 km at a uniform speed of 30 km per hour. How fast the train travels the next 30km so as to have an average of 40 km per hour for the entire trip

physics
Two point charges, Q1 = -2.3 μC and Q2 = +9.3 μC, are placed as shown in the figure. The y component of the electric field, at the origin O, is closest to

Physics
A basketball player throws a ball from a horizontal distance of 10m. The basketball is 3m from tge ground and he releases the ball from a height of 2m from the ground. If he shoots at a 40° angle with the horizontal, at what initial speed must he throw so that a ball goes ...

Physics
a cube has six faces and twelve edges. you start at one corner,are allowed to move only along the edges and may not retrace your path along any edge. Consistent with these rules, there are any number of ways to arrive back at your starting point. For instance, you could move ...

Physics
Light is shone from a liquid onto the air. The angle of incidence in the liquid is 45◦. The angle of refraction is measured to be 60◦ to the nearest degree. What is the refractive index of the liquid can anyone help please, I'm really stoked with this question and I'm not ...

Physics
A boat leaves the shore of a stream. It starts directly across from point A, as shown. The velocity of the boat is 5.2 m/s, at an angle θ = 25E as shown. The stream is 94 meters across, and is moving at 1.5 m/s. How far downstream from point A does the boat land? Round your ...

Physics
A person can directly cross a river of width 100 m in 4 minutes when there is no current, but it takes 5 minutes when there is current. What is the velocity of the current?

physics
hiw much heat is needed to raise the temperature of 0.800 kg. ethyl alcohol form 15.0 celcius to its boiling point 78.3 celcius

physics
Suppose we are given an arbitrary form for the acceleration a(t) of a particle that starts from rest at r(t_i)=0. What would be the derivation of its' position at r(t_f): a)(t_f - t_i)⌠t_f a(t)dt ⌡t_i b) v(t_f)+v(t_i)/2 ((t_f-t_i)) c)⌠t_f dt ⌠t dt'a(t') ??????? ⌡t_i...

Physics
A small wooden block floats on water. Will a wooden block with a hole in it also float?

physics
a body is lights down if exit Garba track that is 1 quadrant of circle of radius R if there is no friction on the body starts from rest its speed at the bottom of the track is

Physics
A man using a 70 kg garden roller on a level surface, exert a force of 200 newton at 45 angle to the ground. Find the vertical force of the roller on the ground (a) if he pulls (b) if he pushes the roller

Physics
A circular metal wire, with a radius of 0.5 mm, has a force of 2 kN applied along it. If the wire has an unstressed length of 3 m and stretches by 8 mm, what is Young’s Modulus for the metal? Give your answer in GPa. Any help would be very appreciated

Physics
From the ideal gas law, calculate the volume per helium atom in a litre of helium gas kept at room temperature and atmospheric pressure. Additionally, calculate the length of the side of a cube with this volume.

Physics
From the ideal gas law, calculate the volume per helium atom in a litre of helium gas kept at room temperature and atmospheric pressure. Additionally, calculate the length of the side of a cube with this volume.

Physics
When a cubic meter of steam at 100°C condenses, how much energy is released?

Physics
A 100-kg object rests on a level surface with a coefficient of friction (both kinetic and static) of 0.40. If the initial velocity is 15m/s and the object comes to rest, (a) how much friction is acting on the object? (b) What is the objects 's acceleration due to friction? (c...

Physics
A pilot of mass m can bear a maximum apparent weight 7 times of mg.The aeroplane is moving in vertical circle.if the velocity of aeroplane is 210m/s while diving up from the lowest point of vertical circle, the minimum radius of vertical circle should be Ans:750m

Physics
a body is moving in a vertical circle such that the velocities of body at different points are critical the ratio of velocities of body at angular displacements 60Â° 120Â° from lowest point is √2:1

Physics
if the body describes a vertical circle then the minimum velocity at angle theta from lowest position is

physics
A faulty Celsius thermometer read 0.7degrees Celsius at melting point of pure ice and 99.5degrees Celsius at boiling point of water at normal pressure. What is the correct temperature when it reads 30 degrees Celsius

PHYSICS 05
A skier leaves a ski jump with a horizontal velocity of 20.0m/s (and no vertical velocity component ). If the height is 10.0 m, (a) How long will it take for the skier to land? (b) What is the magnitude of the horizontal component of the skier's displacement "D" furing the ...

Physics
A gun of mass 0.1kg has a bullet of mass 0.1kg,the bullet laves the piston when fired at a velocity of 200m/s. Find the final velocity. (a) 20m/s (b) 23m/s (c) 30m/s (d) 45m/s (e) 15 m/s Please kindly help me with the questions I posted. Thank you

Physics
A car X moving of mass 500kg accelerates at 1m/s2 when the force due to the engine is 600N. Starting from rest, a car of mass 1000kg accelerates steadily to 20m/s in 10 secs. What is the average power developed

Physics College
A see-saw 3.76 meters long perfectly balances on its own at its center. Two children get on the see-saw. One, weighing 345 N, sits at the left hand end. The other, sits 25.0 cm in from the right hand end. The see-saw is perfectly balanced with the children sitting in these ...

Physics
A boy weighing 650 N wants to cross a creek by using a 5.00 meter long plank as a bridge. He places the plank across the creek and begins to walk across. Consider the supporting forces to be at the ends of the plank, and the plank itself to be weightless. At one point, the ...

Physics
A bomb of mass 6 kg initially at rest explodes in to three identical fragments. One of the fragments moves with a velocity of10 3 / im s  , another fragment moves with a velocity if  10 j m/s, then the third fragment moves with a velocity of magnitude.

Physics-can someone check thjs question?
cgi?id=1501763622#1501763622.1501764356

Physics
An aircraft travels 250 km on a heading of 330 degrees. It then turns due east and travels 420 km. How far and on what heading did it end up from it's starting point? Please help!!!

physics
A sphere of mass 0.4kg moving on a smooth billiard table hit a stationary sphere of mass 0.8kg and was brought to rest. Calculate the velocity at which the second sphere tends to move and loss in K.E energy

Physics,chemistry,maths
On turning a corner a car drIver driving at 36 km per hour find a child on the road 55 metre ahead.he immediately applies brakes so as stop within 5 metre. Calculate the retardation produced and the time taken by the car to stop.

Physics
A man climbs down a rope which is connected to a tree.The breaking stress of the rope is 75℅ of his mass.Find the maximum acceleration he can climb down the rope? Does the breaking stress here acts as the tension(T) If so by applying F=ma downwards, mg-T =ma(a-maximum ...

Physics
The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?

Physics
Inside a box(mass "M"), a light string "X" is atthached to it's bottom and the other end of the string is attached to a mass "m"(this makes a pendulum). This system is attached to the point O(the center of gravity of the system), by a string " Y" and moved with constant speed ...

Physics
Maximum rang to which a boy can throw a ball is 40m maximum hight the bal atain

Physics
Two particles A and B has the same mass and are being kept on a rough horizontal table "d" distance apart.B is kept still and A is given a velocity of u towards B.After the collision,if A comes to its previous point show that, u^2 = 2agd[1+(1/e^2)] a- coefficient of friction I...

Physics
When a body slides along an inclined plane of height 'h' and describes a vertical circle of radius r on reaching the bottom Ans:h =5R/2

Physics PLS HELP
What is the difference between universal gravitational constant and acceleration due to gravity

Physics
I really dont know how to do this one...Can someone please explain? Many thanks!!! a travelling microscope is focused on a mark on the base of an empty beaker.Now the microscope is raised up by 1 cm.and now for it be focused on the previous mark,how much height of water should...

Science physics
A boy stands on the roof of a 50m tall building and thrown a ball horizontslly at 20m/s away from the building. How far away from the foot of the building will the ball land?

Physics
A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?

physics
Suppose that a spring is attached to a wall. On the other end of the spring, it is attached to an object of 0.263kg. When the spring is compressed at a distance of 15cm, it holds an elastic potential energy of 20.0J. The horizontal surface has no friction; frictionless. a) If ...

Physics
A car weighing 1000kg is going up an incline with a slope of 2 in 25 at a steady speed of 18kmph.If g=10m/s2, the power of its engine is

Physics
Ok, my Physics professor gave us this to do uncertainty propagation with these equations. Can some please show me some examples on each of these so I know I'm doing them right? Uncertainty Propagation Since raw data includes uncertainty, all calculations include uncertainty. ...

Science, physics, work/power/enegry
I have to do a crossword puzzle for my exercise due tomorrow but the words aren't fitting... two blanks 1. Going downward 19 blocks on the 6th is "v" 15th is "a" 17th is "I" 19th is "n" and the question is "an example of radiant energy" 2. Going horizontaly 4 blocks on the 3rd...

physics
if the displacement of a particle varies with time as root of x=t+7 what is the relation between the velocity and time

physics
The velocity of a vehicle is measured at two distinct points in time and found to be 30 m/s at 1.0 s and 10 m/s at 2.0 s. Find the acceleration (in m/s2) and initial velocity (in m/s) to complete the equation of motion for the velocity of the vehicle. v(t) = t + Round your ...

physics
A rocket is fired vertically and reaches a speed of 34.3 m/s in half a second. One and a half seconds later the rocket’s speed is 19.6 m/s. Find the acceleration (in m/s2) and initial velocity (in m/s) of the rocket. Complete the equation of motion for the velocity of the ...

physics
An engineer uses a bolt to connect a joint. The force provided by the bolt F is a function of the external load P that it must bear. The bolt applies a force of 200 lb against an external load of 100 lb. The same bolt must apply a force of 400 lb against an external load of ...

physics
A spring is manufactured with a pre-load. A force of 34.5 N compresses the spring by 1.5 cm. A force of 57.0 N stretches the same spring 0.03 m. Find the spring constant k (in N/m) and pre-load Fi (in N) that satisfies the linear equation describing this force, F = kx + Fi. F...

physics
A ball is thrown upward and has a velocity of 67.8 ft/s after 1.0s. After 3.0s, the ball's velocity is 3.4 ft/s. Find the acceleration (in ft/s2) and initial velocity (in ft/s) of the ball. Complete the equation of motion for the velocity of the ball: v(t) = t +

Physics
A ray of light travelling from glass to air is incident at 50 degree from the glass air boundary. What is angle of deviation if the critical angle is 42 degree

physics
if a particle starting with certain initial velocity and uniform accelration covers a distance 12m in first 3 seconds and a distance of 30m in next 3 seconds.then find its inital velocity

Physics
Given vector A= 3 i cap + j cap + 4k cap and vector B = i cap + 3 j cap - 5 k cap. Find the unit vector in the direction of (vector A+ vector B) and (vector A - vector B)

Physics
Two point charges, q1 and q2, of 4.00 uc each, are placed -6.0 cm and 6.0 cm away from the origin on the x-axis. A charge q3 of -1.00 uC is placed 8.0 cm away from the origin on the y-axis. a. Find the distance from q3 to q1 and from q3 to q2. b, Find the magnitude and the ...

Physics
Two point charges, q1 and q2, of 4.00 uc each, are placed -6.0 cm and 6.0 cm away from the origin on the x-axis. A charge q3 of -1.00 uC is placed 8.0 cm away from the origin on the y-axis. a. Find the distance from q3 to q1 and from q3 to q2. b, Find the magnitude and the ...

physics
Suppose that a body of an object is experiencing SHM ( simple harmonic motion) and it oscillates with position x(t)=(0.55m)Cos(35s^-1t + pi) a)What is the period, frequency, and angular frequency b) calculate its initial velocity and the maximum speed it can have C) calculate ...

physics
On planet Earth, a pendulum has a length of L and a period of T .On planet Mars, the pendulum has a length of 4L and period of 5T.what is the acceleration due to gravity ?

physics
if vector A=i cap *A cos thita + j cap *A sin thita, then another vector B , WHICH IS PERPENDICULAR TO VECTOR A,can be expressed as?give detailed answer?

physics
a car is moving with speed 30m/s .Due to application of brakes it travels 30m befor stopping .Find its accelaration

Physics
A force of 20N applied parallel to the surface of a horizontal table is just sufficient to make a block 4kg move on a table, calculate coefficient of friction between the block and the table.

physics
A wire rectangle, 13 cm by 17 cm, has a resistance of 1.8 ohms. The magnetic field inside the loop is uniform and described by the equation B = B0e-at, where B0 = .65 Tesla and a = 200 s-1. The field is perpendicular to the plane of the loop. What is the current induced in the...

physics
On planet Mars, A pendulum has a length of 4L and period of 5T.what is the acceleration due to gravity ?

Maths,physics,biology,english,arabic,chemistry
Calculate the mass of NaOH required to make 500ml of 0.5 M aqueous solution (Molecular mass of NaOH=40)

physics
a wheel starts from rest on application of torque which gives it an angular acceleration @=2t^2-t^2 for first two seconds after which @= 0 then find angular velocity of wheel after 4 seconds.

Physics
A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest

Physics
A rope kept on a horizontal plane moves with a constant acceleration. If a constant force "f" acts on the rope,the tension of the middle of the rope is T. Which of the following are true? a)If the rope has a weight,T/f=1/2 b)If the rope is light,T/f=1 c)If the rope is uniform ...

physics
the electric force between Q1 and Q2 is 1.2 going to left. determine the distance between the two charges, and the electric field, E1 and E2, of the electric charges if Q1 is 6 x 10^-6 C, Q2 is 4 x 10^-6 and test charge of +1 x 10^-6 C

Physics
A man walks 50 m,East, 30 m, South, 20 m,West and 10 m, North. Determine the displacement from the starting point. Find the distance traveled in FPS

Physics
What is the pressure on a swimmer 10meters below the surface of a lake?

A boy on a swing is pulled to a position 2.34 m off the ground and released. At the fastest and lowest point of the swing the boy is 0.50 m off the ground and travelling 3 m/s. The percent efficiency of this swing system is?

Physics
An ocean liner going from San Francisco to Tokyo stops for a few days in Honolulu you are on board and wish to stamate the time it will take you to get to Tokyo.It is 3700km from San Francisco to Honolulu and 6200km from Honolulu to Tokyo.It took 5.1days to reach Honolulu from...

physics
A bullet is fired in to s wall losses half of its velocity after penetrsting 3m.how much further will it penetrate.

physics
A rotating platform is on a table and an object is on the platform. The platform has a diameter of 30.0cm and it has a string wrapped around it. The string is threaded over a pulley ( which is right next to the platform and attached to the edge of the table ) . The pulley also...

physics
A ball is dropped from a cliff and 2 seconds later, a second ball is thrown vertically downward. What must be the initial velocity of the second ball if it overtakes the first ball as it passes 400m ?

physics
a body is thrown vertically upward fron a certain height of pole and their velocity is 100m/s and then it returns to the ground in 6second then find the height of the pole ?

Physics
A runner hopes to complete the 10000-m run in less than 30min. After running at constant speed for exactly 27min, there are still 1200m to go. The runner must then accelerate at 0.20m/s^2 for how many seconds in order to achieve the desired time?

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

Physics
A second's pendulum is taken on the surface of moon where acceleration due to gravity is 1/6th of that of earth.Will the time period of pendulum remain same or increase or decrease?Give a reason.

physics
A circular round disc that has a radius of 5cm and a mass of 32g is rotating with an angular velocity of w. A second disc with the same radius but with half of the mass is dropped onto the rotating disc . The two discs slide against eachother till they both have the same final...

Physics
An elevator weighing 400kg is to be lifted up at a constant velocity of 0.6m/s for this purpose a motor of required horse power is used. (g=9.8m/s).(a)What is the acceleration of motor in case of upward motion? (b)What is power of motor?

Physics - Forces in Equilibrium
A beam BC and a cable AB support a weight of 1200lbs. The beam weighs 300lbs. Calculate the tensions in the cable and the reactions of the support C; where A = 30° and C = 45°

Physics
A single sphere of water is created by joining 1000 of water spheres of radius r and charge (+Q).If the potential of the small and big spheres are w and v respectively, find v/w. My thoughts : The masses of the spheres are proportional to the third power of there radius. So ...

Physics
Why doesn't a magnetic force ALWAYS act on a particle which moves in a magnetic field?

physics
A pitcher can throw a ball towards the home plate at 120km per hour. When thrown, the ball curves. The curveball has a spin of 1250rpm. The ball has a mass of 100g and a radius of 2.5cm Calculate the percentage of total KE that is in rotational KE

physics
A car wheel has a moment of inertia of 0.35kg m^2. It takes 50 seconds to come to rest from the initial angular velocity of 45 rpm. Calculate the magnitude of the average friction torque

Physics
An athlete finished the 100 meter race in 10sec. What was his average speed? acceleration? Acceleration time? Acceleration distance Help with few questions already got the already got the first two V=d/t =100m/10s =10m/s and Acceleration= Vf-Vi/t =10m/s-0/10s =10m/s^2 how to ...

physics
what is the acceleration of ball if a ball throw to the wall with velocity of 6m/s and after striking the wall it backs with velocity of 4.4m/s the time for which ball strike the wall is 0.04seconds.

Physics
A stream of water emerges horizontally from firehouse at velocity of 15.0 m/s. If the nozzle is 10.0 m above the ground, find a. the time required for the water to reach the ground b. the horizontal distance traveled by the water

Physics
Suppose that the lift-drag polar of the previous problem belongs to a 32,000 kilogram aircraft with an average wing chord of 3.5 metres and a wingspan of 30 metres. At a certain moment this aircraft flies in cruise at a speed of 300 ft/s, with an air density of 1.0 kilogram ...

Physics
A golf ball of mass 50.0 grams is at rest on a tee. It is struck by a golf club with an average force of 850 Newtons. The ball accelerates to a speed of 68.0 m/sec. How long was the club in contact with the ball?

Physics
A 900 W toaster operates for 2.50 minutes. How much energy does it use?

Physics
A ball is thrown straight up at 13.0 m/s near the edge of a 30.0-meter high cliff. The ball lands at the bottom of the cliff. a) What is the acceleration of the ball just after it is thrown (magnitude and direction)? b) What is the acceleration of the ball at the peak of its ...

Physics
A person runs off a cliff. The person runs with a speed of 10 m/s and is moving to the right as he leaves the cliff. The cliff is 13 meters above a pool of water. a) Determine the acceleration of the person after leaving the cliff (x and y components). b) Determine the time it...

Physics
Given the following vectors: A = (28, 110°) B = (63, -30°) Determine A + B. Specify the sum as both Cartesian and polar.

Physics
A top fuel dragster can complete a quarter-mile (402 meters) in 4.7 seconds. Assuming that the vehicle starts from rest and that acceleration is constant, calculate (a) the acceleration and (b) the final speed of the top fuel dragster.

physics
the distance between 2 towns T1 and T2 is 400km. two cars A and B start simultaneously from T1 and T2 towards each other. the speed of A is 60km/h and that of B is 40km/h the point where two cars will meet is at?

Physics
g=4 pi (l/t square)

Physics
Steam of 100 degree celsius is passed into ice of 100g . The mixture weighs 120g at 35 degree celsius, find the specific heat of ice.

physics
A wheel has an initial velocity of 3.40rad/s and it rotates 1.25 revolutions before stopping what is the angular acceleration of the wheel how long does it take for the wheel to come to rest