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Q. A box whose mass is 25kg is moved across a horizontal floor by dragging it with a rope attached to the front end. if the rope makes an angle of 30 degrees with the horizontal and if the coefficient of friction is 0.3, find the force exerted by the man on the rope, and the work done in dragging the box over a distance of 15m.
Q. The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 32°C.
Basic science concepts in optics like Which types of electromagnetic radiation can be seen from the surface of Earth.
What minimum force is necessary to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.)
A particular guitar string is supposed to vibrate at 200Hz, but it is measured to actually vibrate at 209Hz. By what percent should the tension in the string be changed to get frequency to the correct value.
What is the value? in this situation, the interference pattern yet appears showing that each individual electron can interfere with itself.
As a car approaching you driver lays on the horn. The horn has an actual frequency of 350Hz but you hear the horn as 390 Hz. What is the speed of the car.
Travelling at a speed of 17.10 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.81 s have el..
A 150 kg hoop rolls along a horizontal floor so that the hoop's center of mass has speed of 0.180 m/s. How much work must be done on the hoop to stop it.
A person walks 21° north of east for 3.30km. How far would another person walk due north and due east to arrive at the identical location.
What frequency will hear after the train passes
Light of wavelength 470 nm in air enters a fishbowl filled with water, then exits by the crown-glass wall of the container. Find the wavelengths of the light (a) in the water and (b) in the glass.
Suppose a constant ratio of 13.60 counts per minute per gram of living matter. A sample of a petrified tree was found to give 1.8 counts per minute per gram. How old is the tree.
Two people are holding up the ends of a 4.75-kg wooden board that is l = 2.00 m long. A m = 3.00-kg box sits on the board, 0.50 m from one end. What forces do the two people exert.
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