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Carol eats a regular hamburger and drinks a glass of cow's milk for breakfast. Suppose that energy content of the hamburger and the milk are 2115 kJ and 565kJ respectively. What % of energy from the food does Carol use to push a sack of rice along a horizontal distance of 4.75 m? Her hands exerted a force of 50N applied 20° down with the horizontal.
Without using your spring scale, estimate the order of magnitude of the mass of your calculator in grams from what you judge to be its size, using the fact that the density of water is 1 g/cm3. Assume that the density of water is about the same as the density of your calculator. 1 g 102 g 104 g 106 g
Falling objects drop with an average acceleration of 9.8m/sec/sec. If an object falls from a tall building, how long will it take before it reaches a speed of 7m/s?
A roller coaster car with a mass of 250kg starts from a height of 100m above the ground just before rolling down the frictionless track. Find the speed of the car as it reaches the ground
A 100N girl rides a 50N bicycle a total of 150m at a constant speed. The frictional force against the forward motion of the bicycle equals 25N. How much work does the girl do? Explain your answer.
An object of mass 20kg is falling in air and experiences a force due to air resistance of 40N. Determine the net force acting on the object and calculate the acceleration of the object.
the displacement of an object of mass m after time t when a net force F acts on it is dependent on F, t and m. use dimensional analysis to work out the formula for the displacement of the object.
Hi, my son is a first year undergrad student studying Chemical Engineering. He is having difficulties understanding Fluid Dynamics. Am looking for an online tutor to help him.