Viewed Questions
(a) When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850m from the hinges. What torque are you exerting relative to the hinges? (b) Does it matter if you push at the same height as the hinges?
The capacity to do work best defines: a. a metabolic pathway. b. entropy. c. kinetic or potential energy. d. a chemical equilibrium. e. thermodynamics.
What is the lowest level of biological organization that biologists consider to be alive? a. a protein b. DNA c. a cell d. a multicellular organism e. a population of organisms
Questions asked
The volume of a red blood cell is 0.090pL. Convert this quantity to liters and write the answer in scientific notation. Be sure your answer has the correct number of significant figures.
Hoan Nguyen
Numerade educator
The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day. They would like the estimate to have a maximum error of 0.15 gallons. A previous study found that for an average family the standard deviation is 2.5 gallons and the mean is 15.2 gallons per day. If they are using a 80% level of confidence, how large of a sample is required to estimate the mean usage of water? Round your answer up to the next integer.
Ivan Kochetkov
Determine whether or not the distribution is a discrete probability distribution and select the reason why or why not. x −4 4 6 P(X=x) 1/3 7/8 1/3
Timothy James
A balloon has a volume of 0.005m^3 and is filled with helium. The density of helium is 0.165kg/m^3. The balloon itself has a mass of 25g. The balloon is floating in the air. (1.3kg/m^3). A) What is the mass of helium inside the balloon? B) What is the gravitational force on the ballon and the helium? C) What is the buoyant force on the ballon? D) What is the acceleration E) If the balloon was filled with air instead of helium, would that change the buoyant force on the balloon? If so, how?
Prabhu Ramji
A glass tube is closed at one end and put into a dish of mercury. A vacuum pump is then used to create (0pa) at the top of the tube. This creates a column of mercury in the tube, as shown. The density of mercury is 13,700 kg/m^3. If the pressure at the bottom of the column is 101,400 Pa, what is the height of the column? Solve What would happen to the height of the column if the pressure at the bottom decreased? Solve
Penny Riley
11.50 kg = object has the given x and y acceleration components. ax = (0.35 m/s^2) + (0.69 m/s^2) and ay = (11.9m/s^2) - (0.63 m/s^2) What is the magnitude Fnet of the net force acting on the object at time 6.07 s? Solve in newtons Fnet What is the angle θ of the net force at this same time? Give your answer as the number of degrees counter-clockwise from the +x-axis.
Susan Hallstrom
Suppose that when Javier stands on a scale in his bathroom it reads 660N. If javier takes his bathroom scale to the elevator in his apartment building and stands on it, what will it read when the elevator is accelerating upward at 2.9 m/s^2? Solve in N
A container full of a gas is shown to the right. The view is from the top down. How does the pressure on side A compare to the pressure on side B? Which is the correct answer? A) Pa<Pb B) Pa=Pb C)Pa>Pb
Which has the most mass: air in a 7935 ft^3 house (density=1.16 kg/m^3), a 2.30 N bag of cement, a 72.9 kg person, or a 9.71lb cat? a)What is the mass of the cat, 𝑚cat? b)What is the mass of the air in the house, 𝑚air?
A 40.0-kg boy steps onto a skateboard and pushes off from the top of a hill. What change in gravitational potential energy Δ𝑈grav takes place as the boy glides down to the bottom of the hill, 4.90 m below the starting level? Solve in J