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The aorta branches into tens of thousands of capillaries whose total cross-sectional area is about 2.75 m2. What is the average blood speed through them?
A block falls from rest from the top of a 178-m-high building. When the block is 58.0 m above the ground, a man, 1.90 m tall, standing directly underneath, sees the block. How much time does he have
The coefficient of kinetic friction between the 48.0 kg block and incline is 0.250. Determine the change in the kinetic energy of the 48.0 kg block as it moves from A to B, a distance of 20.0 m.
A 95 g ball on a 60 cm long string is swung in a vertical circle about a point 200 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The
A uniform electric field of magnitude 6.9 passes through a circle of radius 12 . What is the electric flux through the circle when its face is perpendicular to the field lines?
An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction mu between the object and the surface.
A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 14 km/h with respect
what is the general direction of the airplane's velocity? east of south, north of west,north of east, or west of south?
When these waves move into a shallower part of the lake, their speed decreases to 1.6 m/s, though their frequency remains the same. Find the wavelength of the waves in the shallower water.
A 60.0 Ω resistor is connected in parallel with a 130 Ω resistor. This parallel group is connected in series with a 22.0 Ω resistor. The total combination is connected across a 18.
If the maximum acceleration the vehicle's brakes are capable of is -6 m/s2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer?
A rocket moves upward, starting from rest with an acceleration of 28.0 m/s2 for 4.97 s. It runs out of fuel at the end of the 4.97 s but does not stop. How high does it rise above the ground?
An airplane is heading due south at a speed of 560 km/h . If a wind begins blowing from the southwest at a speed of 95.0 km/h (average). Calculate magnitude of the plane's velocity, relative to the
An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the minimum initial speed necessary to meet the path of the arrow. What is the initia
A car is slides down an icy driveway that slopes at an angle of 10 degrees. What is the acceleration of the car? Assume that the friction between the tires and the icy pavement is negligible.
A superhero flies 271 m from the top of a tall building at an angle of 15 ? below the horizontal. What is the horizontal component of the superhero's displacement?
A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the escalator, what speed must the student excee
A 77.0 -kg person stands on a scale in an elevator. What is the apparent weight in each of the following situations?
Three equal point charges, each with charge 1.90 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.450 m. What is the electric potential energy U of the system?
The turntable is rotating in the opposite direction with an angular velocity of magnitude 0.210 rad/s relative to the earth. The radius of the turntable is 3.10 m, and its moment of inertia about th
A skydiver whose parachute is fully deployed is descending at constant speed. Describe what is happening to her kinetic energy, her potential energy, and her total mechanical energy as she falls. Is
A space station, in the form of a wheel 115 m in diameter, rotates to provide an "artificial gravity" of 3.20 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
An airline passenger dangles her watch from a string while the jet takes off. The string makes an angle of 25o with respect to the vertical while the aircraft accelerates for takeoff, which takes ab
A small ball rolls around a horizontal circle at height y inside a frictionless hemispherical bowl of radius R. Find an expression for the ball's angular velocity in terms of R, y and g. Q1) Find a