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A 112-cm-long rod is rotating around its center. Its mass is 291 g and its angular velocity is 30 rad/s. Suddenly, for no apparent reason, half of the mass goes to one end of the rod and the other h
During the motion considered in the problem, assume that remains constant. Inside the rocket, a 15.6-instrument hangs from a wire that can support a maximum tension of 32.4 . Find the minimum time
While in a third floor office building, you notice a ball moving straight upward just outside the window. It takes 0.14 s for the ball to move up a distance of 1.10 m from the bottom to the top of t
A student standing on level ground finds that an imaginary straight line drawn from his eye to the top of a tree that is 180 feet away makes an angle of 17 degrees above the horizontal. If his eyes
You slide a crate up a ramp at an angel of 30 degress by exerting a 225 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is .28. How much work did you d
A 562 N physics student stands on a bathroom scale in an 824 kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 442 N. Find the magnitu
At the angle determined above the mass begins to move down the incline and experiences a frictional force. If the net acceleration of the mass down the incline is 1.2 m/s2, what is the coefficient o
Water flows through a horizontal tube of diameter 3.0cm that is joined to a second horizontal tube of diameter 1.9cm. The pressure difference between the tubes is 7.8kPa. Find the speed of flow in t
Relative to the ground determine the angle of the velocity vector of the package just before impact.
If the launcher gives the projectile a muzzle velocity of 25m/s, what is the range of the projectile? [Hint: The acceleration due to gravity on the Moon is only one sixth of that on the Earth.]
What would have been the unrealistically large acceleration experienced by the space travelers during their launch? (A human can stand an acceleration of 15g for a short time.)
A river has a steady speed of 0.500 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point. If the student can swim at a speed of 1.20 m/s in still water, how long
A circular surface with a radius of 0.061 m is exposed to a uniform external electric field of magnitude 1.32 x 104 N/C. The electric flux through the surface is 77 N · m2/C. What is the angle
A platinum resistance thermometer has resistances of 170.0 when placed in a 0°C ice bath and 244.8 when immersed in a crucible containing a melting substance. What is the melting point of this s
The Ferrari laps that Porsche after the Porsche has completed 9 laps. If the speed of the Ferrari has been 10km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the
Calculate the maximum force constant of the spring k_max that can be used in order to meet the design criteria.
Jose sees the tree strike 1.0 microseconds before he sees the barn strike. According to Jose, were the lightning strikes simulataneous? If not, which occured first and what was the time difference bet
The spheres have a combined charge of + 55uC and repel one another with a force of 0.75 N. Assume q1>q2.What is the surface charge density on the first sphere?
A 181 g ball is tied to a string. It is pulled to an angle of 4.0 C and released to swing as a pendulum. A student with a stopwatch finds that 30 oscillations take 16 s.
The defroster directly heats an area of 0.45 m2 of the rear window. What is the maximum thickness of ice above this area that the defroster can melt in 3.6 minutes?
The windows in an office building are 4.26 m by 5.26 m. On a stormy day, air is blowing at 53.0 m/s past a window on the 53rd floor. Find the magnitude and direction of the net force on the window.
A 255 g mass attached to a horizontal spring oscillates at a frequency of 2.50 Hz . At t=0 s , the mass is at = 4.40 cm and has vx = -32.0 cm/s . Determine:
What minimum coefficient of friction between a rider's clothing and the wall is needed to keep the rider from slipping?
The thrust of the skis is parallel to the skis. There is no friction on the slope, and air resistance can be ignored.
Darius the dare devil plans to launch his rocket car at the top a ramp inclined at 20.0 degrees to the horizontal over a pit of fire 20 m in diameter, unfortunately the rocket motor fails at the foo