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1. In order to qualify for the finals in a racing event, a race car must achieve an average speed of 250 km/h on a track with a total length of 1 600 m. If a particular car covers the first half of the track at an average speed of 230 km/h, what minimum average speed must it have in the second half of the event in order to qualify?
2. Runner A is initially 4.0 mi west of a flagpole and is running with a constant velocity of 6.0 mi/h due east. Runner B is initially 3.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole when they meet?
An electric motor rotating a workshop grinding wheel at a rate of 1.01 102 rev/min is switched off. How long does it take for the grinding wheel to stop
A horizontal wire of length 0.51 m, carrying a current of 7.8 A, is placed in a uniform external magnetic field. Determine the magnitude of the external magnetic field
Suppose a block of mass M is sliding down an inclined plane which makes an angle t with the horizontal. What is the work done by friction as the block travels a distance d along the plane
What velocity must be transferred to the spacecraft to crash it into the sun? Assume it is initially in a solar circular orbit, at the same distance from the sun as the Earth. What velocity must be transferred to the spacecraft so that it will escape..
an initially stationary block of mass m on a floor. A force of magnitude F = 0.580·mg is then applied at upward angle ? = 16°. What is the magnitude of the acceleration of the block across the floor if (a) ?s = 0.600 and ?k = 0.500
The minimum angle of resolution of the diffraction patterns of two identical monochromatic point sources in a single-slit diffraction pattern is 7.5×103rad. what is the wavelength of the sources
Two parallel plates having charges of equal magnitude but opposite sign are separated by 24.0 cm. Determine the force on the proton
A uniform electric field is oriented so that it makes a 60.0° angle with the normal to a 1.0 m2 surface. Find the induced displacement current through the surface
Calculate the electrostatic force exerted on the point charge by the cylinder and what level of uncertainty would be acceptable in the initial position? You may assume that the uncertainty in all other parameters is negligible
When responding to sound, the human eardrum vibrates about its equilibrium position. What is the maximum acceleration of the eardrum
Although there are many mechanisms that help large mammals (such as elephants) keep cool in hot climates, the size of ears is a big factor. estimate the relative temperature difference between the territory of African elephants versus the territory ..
a single conservative force acts on a 5.00 kg particle. the equation fx 2x 4 n describes this force where x is in
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