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The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time it takes the nerve impulse to travel to your brain. (Assume that you
The elevator is moving upward with an acceleration of magnitude 1.4 m/s2. What pressure (in excess of atmospheric pressure) is applied to the floor beneath the suitcase?
What is the magnitude of the largest pushing force that can be applied to the refrigerator before it just begins to move? Assume g = 9.81 m/s2.
A rifle that shoots bullets at 500 m/s is to be aimed at a target 46 m away and level with the rifle. How high above the target must the rifle barrel be pointed so it hits the target?
He was supposed to travel due north for 4.7 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 49° north of due east.In what direction must he travel? (Counterclockwi
A 5.5 -thick layer of oil (n=1.46) is sandwiched between a 1.3 -thick sheet of glass and a 2.3 -thick sheet of polystyrene plastic (n=1.59). How long (in ns) does it take light incident perpendicula
The car is moving with a constant velocity. At a time t = 18 s, the car just reaches the front of the train. Ultimately, however, the train pulls ahead of the car, and at time t = 36 s, the car is a
The magnitude of the force on q1 due to q2 equals the magnitude of the force on q1 due to the electric field of the parallel plate capacitor. What is the distance r between the two charges?
An astronaut lands on a distant planet and performs an experiment to determine the local value of g, the acceleration due to gravity. They construct a simple pendulum of length 0.50m.
Two cars are traveling at equal speeds but in opposite directions. One car sounds its horn at a frequency of 111 Hz, which the other driver hears as a frequency of 105 Hz. What is the speed of each
A man can throw a ball a maximum horizontal distance of 142 m. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball vertically upward with the same initial speed?
Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 860 Hz. Point P is 12.0 m from A and 13.4 m from
For 1000-Hz waves in air, what displacement amplitude would be needed for the pressure amplitude to be at the pain threshold, which is 30 Pa?
The largest watermelon ever grown had a mass of 118 kg. Suppose this watermelon were exhibited on a platform 5.oo m above the ground. After the exhibition , the watermelon is allowed to slide along
Now consider a second inclined plane with the same tilt angle for which the coefficient of kinetic friction between the block and the plane is muk = 0.15. What initial speed now is required for the
Two blocks of mass m1 = 15 kg. and m2 = 9 kg. are pushed against each other (m1 on top) and sliding down an incline of 35 degrees. a) If the plane is frictionless, what is the normal force between t
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 18.0 s. How tall is the tower? If this pendul
The coefficient of static friction between block m1 and the inclined plane is mu (s) = 0.25. What is the largest mass for m1 for which the blocks will remain at rest?
An airplane has a velocity relative to the air of 200 m/s in a westerly direction. If the wind has a speed relative to the ground of 60 m/s directed to the north, what is the speed of the airplane r
How far does the ball drop due to effects of gravity by the time it reaches home plate? (Ignore any effects due to air resistance and assume you throw the ball horizontally.)
A stone thrown horizontally from the top of a 12-m tower hits the ground at a point 19 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the ston
The Steeler kicker wants to kick a football through the uprights from a distance of 30 m. (okay - it's metric football). The kicked football has a velocity of 25 m/s at an angle of 30 degrees. Will
Two wheels of mass m and moment of inertia I are connected by a massless axle of length L. The system rests on a frictionless surface and the wheels rotate without frequency ω around the axle.
A rod 14.0 cm long is uniformly charged and has a total charge of 222.0 mC. Determine (a) the magnitude and (b) the direction of the electric field along the axis of the rod at a point 36.0 cm from
If a charged blue board is held above the pie pan, will there be a net charge on plate 1? If there is a net charge, what sign will it have? Would there be a net charge on the second plate?