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A public transport users' group claims that, for people working in the central business district, it takes longer to get to work by car than it does by public transport. They randomly select 60 people who work in the central business district. Each person is asked to record their travel time to work on two separate occasions - once when they travel to work by public transport and once when they travel to work by car.
Which of the following designs was used in this study?
to measure the acceleration due to gravity on a distant planet an astronaut hangs a 0.102-kg ball from the end of a
At the same temperature, how does the internal energy of 1 mole of helium gas compare with the internal energy of 1 mole of argon gas? (Select all that apply.)
A disk-shaped merry-go-round of radius 2.73m and mass 185kg rotates freely with an angular speed of 0.681rev/s. What is the final angular speed of the merry-go-round
How much work did the movers do (horizontally) pushing a 150- crate 10.2 across a rough floor without acceleration, if an effective coefficient of friction was 0.50.
A 1.20 kg ball and a 4.00 kg ball are connected by a 74.0 cm long massless, rigid rod. What is the rotational kinetic energy of the structure
The inner radius of the yoyo is r = 2.77 cm, and the outer radius is R = 4.49 cm, and the moment of inertia about the axis perpendicular to the plane of the yoyo and passing through the center of mass is ICM = 1.28 x 10-4 kgm2. Determine the linea..
A 4.00 kilogram block starts from rest at the top of a 30 degree incline and slides a distance of 2.10 meter down the incline in 1.40 second. Determine the frictional force acting on the block
Consider the following equations of motion. v = v0 + at ?x = v0t + (1/2) at^2 v2 = v02 + 2a?x (a) Can the equations above be used in a situation where the acceleration varies with time? (b) Can they be used when the acceleration is zero?
A charged cork ball of mass 0.50 g is suspended on a light string in the presence of a uniform electric field, Find the charge on the ball
The speed of a bobsled is increasing because it has an accelerationof 2.4 m/s2. At a given instant in time, the forcesresisting the motion, including kinetic friction and airresistance, total 450N. The combined mass of the the ridersis 270kg
A 15g bullut is stopped in a block of wood ( mw=5.8 kg). What was the origional speed of the bullet
A railroad car of mass 3.5*104 kg moving at 3.50 m/s collides and couples by two coupled railroad cars, each of the same mass as the single car and moving in the similar direction at 1.20 m/s. How much kinetic energy is lost in the collision?
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