Which of the following is/are not true for a randomized clinical trial: a) Subjects are randomly assigned to treatment and control groups b) The comparison of outcome between treatment and control...
Which of the following is/are not true for a randomized clinical trial: a) Subjects are randomly assigned to treatment and control groups b) The comparison of outcome between treatment and control...
I am a weight lifter and want to calculate how much "work" I do when performing the deadlift. I did the math and want to ensure my concepts and calculations are correct, as it has been a...
There a mass of 4kg and a mass of 5kg connected by an inextensible string passing over a smooth pulley .the mass for 4kg starts from rest and moves up the smooth plane inclined at 30degree to horizontal...
how many feet of cable are needed to connect the deck to the main cables between the two towers? show all your work? assume that we need to build a bridge that spans 2400 feet. The two towers,...
The blades of a wind mill sweep out a circle of area A.If wind flows with velocity v perpendicular to blades of wind mill and its density is D,then the mechanical power received by wind mill is (a)...
A car of mass m has an engine which can deliver power P.The minimum time in which car can be accelerated from rest to a speed v is (a) (mv^2)/2P (b) Pmv^2 (c) 2Pmv^2 (d) (mv^2)P/2...
A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when options are (a) U(x)>E (b) U(x)<E (c) U(x)=0 (d)...
A young girl (m = 30 kg) rides a skateboard (m = 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s...
A pump is used to pump a liquid of density D continuously through a pipe of cross section area A.If liquid is flowing with speed v,then power of pump is (a) (DAv^2)/3 (b) (DAv^2)/2 (c)...
bob wanted to buy a sweater which cost $97.00. Mom gave him $50.00 and dad gave him $50.00. He bought the sweater and received $3.00 change. He gave dad $1.00 and mom $1.00 and kept...
How much work is done in lifting the spaceship to an altitude of 70 miles? a. 2450 mi-tons b. 2100 mi-tons c. 3500 mi-tons d. none of these
The force pulling an object to earth is where G is the gravitational constant, M is the mass of the Earth, m is the mass of the object, and r is the distance between the object and the center...
a. W=F+d b. W=F-d c. W=Fd d. W=F/d
you are working in an event management department, a coworker having the same job scale has been asked to work with you, the coworker is rude and biased but she has good terms with the manager of...
Suppose a gas of 2D atoms is trapped inside a square of area A. What is the expression for the work done on the system as the area of the square changes?
Find the work required to lift a mass of 5 tonnes to a height of 30m. If this is done in 2 minutes, what power is being used?
A boy pulls a 10.0 kg book rack at rest on a smooth floor with a constant horizontal force of 1.2N starting from rest. Compute the change in kinetic energy of the box after the...
A cylindrical tank of radius 4 ft and length 12 ft is lying on its side on horizontal ground. The tank initially is full of gasoline weighing 40 lb/ft3. How much work is done in pumping all this...
A ramp is inclined at 12 degrees to the horizontal. A cart is pulled 8m up the ramp by a force of 120N, at an angle of 10 degrees to the surface of the ramp. Determine the mechanical work done against...
Which is a function? A. (2,9),(-1,1),(-1,-2),(1,-1) B. (2,9),(9,-1),(2,1) C. (2,9),(9,2),(1,1) D. {2,9,-1,1}