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While traveling on a dirt road, the bottom of a car hits a sharp rock and a small hole develops at the bottom of its gas tank. if the height of the gasoline in the tank is 28 cm, determine the initial
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When landing after a spectacular somersault, a 40.0-kg gymnast decelerates by pushing straight down on the mat. calculate the force she must exert if her deceleration is 7.00 times the acceleration du
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We have discussed the motion of electrons in a conductor and the conditions under which ohms law arises in a resistor. but there are other situations in which potential differences lead to current flo
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University physics 6.81: calculate the friction. consider the system shown below. the rope and pulley have negligible mass, and the pulley is frictionless. initially the 6.00 kg block is moving downwa
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Two fully annealed cylindrical specimens of an alloy are to be hardened by reducing their (always circular) cross-sections in an extrusion process. for one specimen, the initial and post-deformation r
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The sketches below show a circular coil and a permanent magnet; the arrows indicate both the magnitude and the direction of the velocities of the magnet and coil. in which situations will the induced
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The large blade of a helicopter is rotating in a horizontal circle. the length of the blade is 5.8 m, measured from its tip to the center of the circle. find the ratio of the centripetal acceleration
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The full-wave converter used as an inverter in fig. 4-14 has an ac source of 240 v rms at 60 hz, r 10 , l 0.8 h, and vdc 100 v. the delay angle for the converter is 105. determine the power supplied t
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The drawing shows a golf ball passing through a windmill at a miniature golf course. the windmill has 12 blades and rotates at an angular speed of 1.75 rad/s. the opening between successive blades is
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The bar ab is supported by two smooth collars. at a the bar is rigidly attached to the collar, and at b the collar is connected to the bar by a ball-and-socket joint. if a 100 lb load is applied to th
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Refrigerant 134a enters a condenser operating at steady state at 60 ibf/in.2and 140°f and is condensed to saturated liquid at 60 lbf/in.2on the outside of tubes through which cooling water flows. in
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In pulse amplitude modulation encoding, the general rule is that we need to sample at twice the bandwidth. in addition, if we use n bits for each sample, we can represent 2n loudness (amplitude) level
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Imagine that the container from the problem introduction is now filled with n identical gas particles of mass m. the particles each have different x velocities, but their average x velocity squared, d
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Find the magnitude of the net torque τ acting on the system. be sure to use the absolute value function in your answer, since no comparison of m1, m2, and mbar has been given. express your answer in
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Find the magnitude of the magnetic flux through the floor of a house that measures 21 m by 18 m . assume that the earth's magnetic field at the location of the house has a horizontal component of 2.8
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Copy the order form from lab exercise 2, part 3 to l4p3.html. (you can use the unix command cp l2p3.html l4p3.html to do this or copy it locally and upload the copy with your sftp tool.) make a link t
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Case omicron: augustino stands on the scale which is placed on a shallow ramp which has a very low incline angle. case upsilon: augustino stands on the scale which is placed on a level floor. case iot
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A solid hemisphere of radius b has its flat surface glued to a horizontal table. a second solid hemisphere of different radius a rests on top of the first one so that the curved surfaces are in contac
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A particle with a charge of 7.80 nc is in a uniform electric field directed to the left. another force, in addition to the electric force, acts on the particle so that when it is released from rest, i
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An astronaut has a mass of 70 kg. what is the weight of the astronaut on earth at sea level? what are the mass and the weight of the astronaut on the moon, and on mars? what is the ratio of the pressu
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A 4.00-m-long, 460 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. a 73.0 kg construction worker stands at the far end
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A lens of focal length 40 mm is mounted on a 35 mm camera. the lens aperture is set at f/5.6 and the shutter speed set at 1/250 s. a different camera has a lens of focal length 56 mm in place. the shu
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A is 300 kpa, the volume flow rate of water at 10°c delivered to the tank is 0.0035 m3/s. if we want to reduce the flow rate in half, what should the valve opening (s/d) be? the pressure at a still r
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9. WHERE SHOULD YOU START MAKING A U-TURN WHEN DRIVING ON A DIVIDED STREET WITH MULTIPLE LANES IN YOUR DIRECTION? A. On the shoulder B. In the left lane C. In the median
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A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). at the lowest point in the swing the tension in the string is equal to 20 n. to what maximum height above
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When two objects push or pull on each other, which type of energy is being transferred? A:Chemical Energy B:Electrical Energy C:Mechanical Energy D:Sound Energy
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I need help with a couple of questions. 1 The smaller molecules from which polymers are built are called #####= blank 2 is How do polymers form?
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A small 30 kilogram canoe is floating downriver at a speed of 2 m/s. what is the canoes kinetic enegry?
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A student pulls on a 20 kg box with a force of 50 N at an angle 45 degrees relative to the horizontal. The box increases speed at a rate of 1.5 m/s2. What is the approximate normal force on the box?
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G to correct myopia, concave lenses are prescribed. if a student can read her physics book only when she holds it no farther than 18 cm away, what focal length of lens should be prescribed so she can
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A uniform, 0.0300-kg rod of length 0.400 m rotates in a horizontal plane about a fixed axis through its center and per- pendicular to the rod. two small rings, each with mass 0.0200 kg, are mounted so
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A spherical balloon has a radius of 11.5 m, and is filled with helium. how large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1000 kg? neglect the bouyant fo
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A quantity of an ideal gas is contained in a balloon. initially the gas temperature is 27°c. you double the pressure on the balloon and change the temperature so that the balloon shrinks to one-quart
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Answers to a physics student from pittsford throws a ball thrown horizontally from the top of a building with a speed of 8 m/s. the student measures the height of the building to be 15m what is the ba
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An elite runner can run with a speed of 30 m/s. if the runners mass is 25 kg, what is their kinetic energy?
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A pendulum has 295 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?
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A golf ball is hit an an initial speed of 30 m/s. if the ball is directed at an angle of 55° above the horizontal, what is its horizontal range of the ball?
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What are the job prospects for students with either a bachelor’s degree, master’s degree, or a doctoral degree in psychology?
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A 3.8 kg object is lifted 12 meters. Approximately how much work is performed during the lifting? A. 446.9 J B. 372.4 J C. 588 J D. 45.6 JA 3.8 kg object is lifted 12 meters. Approximately how much wo
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Which properties can be used to determine whether a substance is a liquid or a plasma? Check all that apply.
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What is the time required for an object starting at rest to fall freely 500 meters near earth surface
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You are measuring the speed of light through a material and come up with a value of 1 x 108 m/s. from this you can deduce that:
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When water breaks apart, it releases positively charged ____________ ions and negatively charged ____________ ions?
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A rock has a mass of 25 kg. the acceleration due to gravity is 10m/2^s and the height of the rock is 42m. find the potential energy of the rock
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What is the maximum instantaneous power dissipated by a 3.3-hp pump connected to a 240-vrms ac power source? 1 hp = 746 w?
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The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective
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The electric potential at a position located a distance of 21.9 mm from a positive point charge of 6.80×10-9c and 14.5 mm from a second point charge is 1.14 kv. calculate the value of the second char
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Suppose that she pushes on the sphere tangent to its surface with a steady force of f = 75 n and that the pressurized water provides a frictionless support. how long will it take her to rotate the sph
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One dimensional, steady-state conduction with uniform internal energy generation occurs in a plane wall with a thickness of 50mm and a constant thermal conductivity of 5 w/(m*k). for these conditions,
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In the previous question, the person had an initial velocity of 8m/s and a constant acceleration of −4m/s2. how would the maximum distance he travels to the right of the origin change if instead his