the significant

the significant figure in 0.080 kg is a. 4 b. 3 c. 2 d. 1

a train

a train is approaching a station and blows its horn with a frequency of 200hz. if the train has a speed of 25 m/s and the speed of sound is 350 m/s, what is the frequency of sound heard by the people standing on the platform a. 190hz b. 186hz c. 210 hz d. 200hz

a 200 g object is moving in a circle of radius 4.0 m a

a 200 g object is moving in a circle of radius 4.0 m a uniform speed of 6.0 m/s. the net force acting on the object is: a. 3.6 N towards the center of the circle b. 3.6 N tangential to the circle c 1.8 towards the center of the circle d. 1.8 N away from the center 0f the circle

a steel meter rod

a steel meter rod reads the correct length of objects at 20 degrees C. if the temperature of the steel rod increases to 30 degrees c and the scale to measure the length of an object, it will a. give the correct length of the object b. underestimate the actual length of an object c. overestimate the actual length of the obje ...continues

a person moves

a person moves 30m north, then 20m east and then 30(square root 2) m 45 degrees south of west. his displacement from the original position is a. 14m south west b. 10m west c. 28 m south d. 15 m east

a 50 g ball of putty

a 50 g ball of puty moving with a velocity of 3.0 m/s has an inelastic collision head on with a stationary mass of 50 g and sticks to it. find the velocity of the mass and putty after the collision a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s

in a thin water

in a thin water film in air, there are exactly 80 wavelengths of blue light inside the film. the reflected light from the two surfaces of the film will a. be deficent in blue light b. be brightest in the blue part of the specrtum c. have the normal amount of blue light d. none of the above

a car is traveling

a car is traveling downhill with a constant velocity. which of the following statement is true a. there is no net force acting on the car b. there is a net force acting on the car in the down hill direction c. there is a net force acting on the car in the uphill direction d. there is a net vertical force acting on the car

find the kinetic energy

find the kinetic energy of a cylindrical shaft of mass 2.0 kg and radius 10cm rotating about its central axis at 600 rad/s a. 1800 j b. 1200 j c. 18000 j d. 12000 j

a piece of wood

a piece of wood floats in oil density 8oo kg/m^3 with 25% of its volume above the durface of the oil. if the piece of wood is placed in water, it will float in water with a. 60% of its volume above the water b. 25% of its volume above the water c. 40% of its volume above the water d. 75% of its volume above the water