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Estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away.
Assume 18 g of a substance marketed as "Pure Energy" is annihilated by 18 g of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 1.7 × 109 W of
What is the (a) maximum and (b) minimum resistance that the variable resistor needs to provide in order for the "toasting" to last between 30 and 90 seconds?
A 51.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.800 and 0.410, respectively.
At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 41 m horizontally and h = 67 m vertically above the launch point. At the instant it reaches its maximum
The second force is an inverse square law, with magnitude A/x2 and direction away from the origin. Calculate the frequency of small oscillations around the equilibrium. [Data: M = 0.37 kg; B = 18 N;
During this process, 6 J of energy is expended by the external mechanism that expanded the gas. Which of the following statements is correct?
A long line carrying a uniform linear charge density +50:0C=m runs parallel to and 10:0cm from the surface of a large, at plastic sheet that has a uniform surface charge density of 100C=m2 on
A 3.55-kg object is thrown vertically upward from the surface of Mercury, where the acceleration due to gravity is g1 = 3.70 m/s2. The initial velocity is v1, and the object reaches a maximum heigh
A snowmobile climbs a hill at velocity v-up. The slope of the hill is a 1 ft rise for every 40 ft of distance. The resistive force of the snow is equal to 4.1 percent of the weight of the snowmobile
Three uniform thin rods, each of length L = 22 cm, form an inverted U. The vertical rods each have mass of 14 g; the horizontal rod has mass of 48 g. Where is the center of mass of the assembly (x,
The frequency of an opera singer is 450 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer who is running down the road towards the opera singer with a spee
After the RCS thruster is turned off, find (a) the magnitude and (b) the direction of the vehicle's velocity relative to the space station. Express the direction as an angle (in degrees) measured f
You are driving to the grocery store at 15 m/s .You are 150 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.80 s. and that your car brakes with constant
A 430g block slides along a frictionless surface at a speed of 0.35 m/s.it runs into a horizontal massless spring with spring constant 47 N/m that extends outward from a wall. it compress the sprin
An electron (mass m = 9.11×10-31kg) is accelerated in the uniform field E (E = 1.42×104N/C) between two parallel charged plates. The separation of the plates is 1.38cm. The electron is
Given the symmetric situation of the previous problem, what is the magnitude of the force on an electron placed at point P?
A ball of mass 1.020 g and positive charge q =40.2microC is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of theta=15.0o from the
A research reactor, after going critical for the first time, operates at a power level of 100W for 4 hours. How much fission product activity in Ci does the reactor contain at the following times af
An airplane is flying with a velocity of 85.0 at an angle of 22.0 above the horizontal. When the plane is a distance 113 directly above a dog that is standing on level ground, a suitcase drops out
A raindrop with a radius of 1.5 mm and mass 0.014 g falls from a cloud that is at a height of 1200 m above the ground. What is its terminal speed? (Take the drag coefficient to be 0.6, and assume th
A street lamp weighs 158 N. It is supported equally by two wires that form an angle of 104 degrees with each other. What is the tension of each of these wires?
An 845-N sled is pulled a distance of 190 m. The task requires 1.70 104 J of work and is done by pulling on a rope with a force of 124 N. At what angle is the rope held?
Calculate the magnitude of the gravitational force exerted by Venus on a 80 kg human standing on the surface of Venus. (The mass of Venus is 4.91024 kg and its radius is 6.1106 m.)