Question Solved1 Answer Someone takes 15 minutes to walk up a hill 100 m high. His weight is 600 N. How much work did he do in climbing the hill? What power is developed by his muscles as he climbs? If he climbs up the hill, his muscles can exert 600 watts. How long will it take him to get to the top of the hill?

Question 10 Suppose that the speed of light in a vacuum ( c), instead of being a whopping 3×108m/s, was a rather sluggish 40.0mph. How would that affect everyday life? Throughout this problem we are going to assume that c=40.0mph and that time dilation is in full effect. Let's start by assuming that it is fairly easy to accelerate to speeds close to 40.0mph. We will also ignore gravity throughout this problem. Otherwise, the earth (with an escape velocity of 11km/s) would have turned into a black hole long ago. Part B The restaurant the student likes to go to doesn't have any clocks. As a result, the only way that the student can keep track of the time so as not to be late is to keep an eye on her wristwatch. According to the student's watch, how much time does she actually have for the entire lunch break (travel, serve, and eat) if she wants to go to the furthest restaurant? Express your answer in minutes. View Available Hint(s) Part C Now, suppose the student wishes to bring back some ice cream from the restaurant for her friends at school, but since it is such a hot day, the ice cream will melt away in the car in only 5 minutes. How fast will the student have to drive back to get the ice cream to her friends before it completely melts? Express your answer in miles per hour. View Available Hint(s)

You charge a piece of aluminum foil (mass= 5.2 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 18.1 µC. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric You charge a piece of aluminum foil (mass= 5.2 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 18.1 µC. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume it is a uniform field and the aluminum foil is a point charge).

You charge a piece of aluminum foil (mass = 7.85 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of −13 µC. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume it is a uniform field and the aluminum foil is a point charge).

Celia works as an articling student with a large law firm. Her wage increased from $30 per hour to $40 per hour. She can work up to 40 hours each week. The table below shows her utility from different levels of leisure and income. If Celia continues to work 40 hours per week after her raise, the raise will increase her utility by: Hours of Leisure Total Utility from Leisure Income Total Utility from Income 0 0 0 0 10 29 300 42 20 54 400 74 30 73 600 96 40 86 800 113 50 92 900 119 1200 124 1500 128 1600 129 2000 131 2500 132

You charge a piece of aluminum foil (mass = 11.11 g) by touching it to a charged rod. The charged rod gives the aluminum foil a charge of 18 µC. Your professor brings a charged plate over and tells you to put the aluminum foil on top of the plate. To your surprise the aluminum foil hovers motionless in the air above it! Calculate the value of the electric field from the charged plate (assume it is a uniform field and the aluminum foil is a point charge).

7. A pump receives 8 kg/s of water at 220 kPa and 110 degree C and discharges it a 1100 R$a. Compute for the power required in lalowatts.