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A jogger accelerates from rest to 5.87 m/s in 3.53 s. A car accelerates from 21.3 to 34.7 m/s also in 3.53 s. (a) Find the magnitude of the acceleration of the jogger. (b) Determine the magnitude o
what angle does the resultant force make with each of the two forces if the resultant of 2 forces with magnitude 56 Newtons and 36 Newtons is a force of magnitude 75 Newtons.
Describe the forces an observer on the turntable would measure on the cannonballs after they leave the cannon. (please include a diagram showing clearly the direction of the forces) Compare to the f
A fly is crawling on an adjacent wall at a point having coordinates (2.6, 2.8), where the units are meters. Express the location of the fly in polar coordinates.
A helium-neon laser intended for instructional use operates 7.5 mW. Find the maximum value of the electric field at a point where the cross sectional area of the beam is 10mm.
What is the coeffcient of static friction between the chair and the ?oor.
A drunken sailor stumbles 555 meters north, 505 meters northeast (45° north of east), then 455 meters northwest (45° north of west). What is the total displacement and the angle of the displ
On a spacecraft, two engines are turned on for 702 s at a moment when the velocity of the craft has x and y components of velocity v0x = 3290 m/s and v0y = 5105 m/s. While the engines are firing, t
A 0.50 kg stone attached to a string is whirled in a horizontal circle of radius 43 cm as in the figure below. The string makes an angle of 35° with the vertical. What is the speed of the stone?
The sun is more massive than the moon, but the sun is farther fromthe earth. Which one exerts a greater gravitational force on aperson standing on earth? Give your answer by determining the ratioFs
A 3.0-m-long rigid beam with a mass 140 kg is supported at each end. An 75 student stands 2.0 m from support 1.
A 0.850 block is attached to a spring with spring constant 17 . While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 39 . What is the b
Assume the cross-section of each bar is unaffected by the heating and determine the effective coefficient of linear expansion for the composite bar x in terms of L1, L2, x1,and x2.
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 1.44 s after shouting. Determine the length of the
In a certain semiconductor, at temperatures close to room temperature, the intrinsic electron density is found to increase by 8% per degree rise in temperature and the mobility is found to decrease
A coiled telephone cord forms a spiral with 55 turns, a diameter of 1.30 cm, and an unstretched length of 60.0 cm. Determine the self-inductance of one conductor in the unstretched cord.
A solid sphere of radius 40.0 cm has a total positive charge of 26.0 μC uniformly distributed throughout its volume. Calculate the magnitude of the electric field (a) 0 cm, (b) 10.0 cm, (c) 40.0
You are trying to loosen a 2.2-cm-"diameter" nut that seems to be stuck on a bolt. If you do it by hand, without a tool, you need to exert a force of F = 600 Newtons. If you use a torque wrench inst
A 5.00* 10^2 kg hot air ballon takes off from rest at the surface of the earth. THe non conservative wind and lift forces take the balloon up, doing +9.7*10^4J of work on the ballon in the process.
a civil engineer is in charge of building a section of the interstate that includs a turn whose radius is 80 m, what will be the maximum allowable speed on this interstate?
A 60 kg pole vaulter running at 10.0 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.0 m/s and air resistance is disregarded, how high was the jump?
A 3.0-m-long rigid beam with a mass 150 is supported at each end. An 80 student stands 2.0 from support 1. How much upward force does support 1 exert on the beam?
A 42 kg child sits in a swing supported by two chains, each 3.6 m long. The acceleration of gravity in 9.8 m/s2. If the tension in each chain at the lowest point in 350N, find the child's speed at
A scuba diver shines a flashlight from beneath the surface of water (n = 1.33) such that the light strikes the water-air boundary with an angle of incidence of 37°. At what angle is the beam re
an electron accelerated from rest through a voltage of 520V enter a region of constant magnetic field if a electron follows a circular path with a radius of 18 cm, what is the magnitude of the magne