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Traveling at a speed of 17.2 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.630.
Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude of 6.2 m/s2. Ignore the effects of air resistance. Take the up
During a circus performance, a 65.1-kg human cannonball is shot out of a 17.3-m-long cannon. If the human cannonball spends 1.04 s in the cannon, determine the average net force exerted on him in th
Consider two identical conducting spheres whose surfaces are separated by a small distance. One sphere is given a large net positive charge, and the other is given a small net positive charge.
In the women's competition, the end of a typical launch ramp is directed 63° above the horizontal. With this launch angle, a skier attains a height of 14.9 m above the end of the ramp. What is t
A cubical surface surrounds a point charge +q. Describe what happens to the total flux through the surface if (a) the charge is doubled, (b) the volume of the cube is doubled,
A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.810 m/s at an angle of 33.0° above the table, and it lands on the magazine 0.077
A volleyball is spiked so that it has an initial velocity of 16.5 m/s directed downward at an angle of 50.5 ° below the horizontal. What is the horizontal component of the ball's velocity when t
Two 2.1 kg physical science textbooks on a bookshelf are 0.27 m apart. What is the magnitude of the gravitational attraction between the books?
The highest barrier that a projectile can clear is 10.9 m, when the projectile is launched at an angle of 31.0 ° above the horizontal. What is the projectile's launch speed?
A major-league pitcher can throw a ball in excess of 39.6 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0 m away from the poin
In an electron microscope, there is an electron gun that contains two charged metallic plates 2.75 cm apart. An electric force accelerates each electron in the beam from rest to 9.50% of the speed
You are designing a small coil (called a search coil) to measure magnetic fields. It is to have a diameter of 4.00 and is to be designed so that flipping it 180in a field of 0.180 causes a maximum t
A 50 kg woman slides down a waterslide from a height of 30.0 meters, The slide is a straight slope, inclined at 45o with respect to the horizontal.The woman's speed at the bottom of the slide is 22.0
By how much should we adjust the mass or length of the pendulum so that the clock keeps correct time ?
A jar of salsa sits on a wheel that is turning at 22 rpm (revolutions per minute). If the jar sits 41 cm from the center of the wheel, what is the acceleration of the jar?
A 21.0 -long wire with a linear density of 30.0 passes across the open end of an 82.0 -long open-closed tube of air. If the wire, which is fixed at both ends, vibrates at its fundamental frequency,
In a certain ride at a carnival, people are rotated in a cylindrically walled room with a radius of 4.8 m, and the rotation frequency is 0.7 revolutions per second when the floor drops out. What is
When point charges q1 = +3.4 µC and q2 = +2.0 µC are brought near each other, each experiences a repulsive force of magnitude 0.97 N. Determine the distance between the charges.
What must be the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision?
A car can decelerate at -4.00 m/s2 without skidding when stopping on a level road. What would be the magnitude of its deceleration if the road were inclined at 15° uphill?
When a 4.32 kg object is hung vertically on a certain light spring that obeys Hooke's Law, the spring stretches 2.92 cm.
A series RC circuit has a time constant of 0.820 s. The battery has an emf of 50.0 V, and the maximum current in the circuit is 480 mA. (a) What is the value of the capacitance(F)? (b) What is the c
A uniform board has a mass of 25 kg and is 4 m long. The board is resting on a fulcrum that is 1.3 m from one end. What mass of brick must be placed on the end of the board so that the board will ba