Exam 5: More Applications of Newtons Laws

An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius.What is the magnitude of the resultant force on the 75-kg pilot of this airplane?

A 50-kg child riding a Ferris wheel (radius = 10 m)travels in a vertical circle.The wheel completes one revolution every 10 s.What is the magnitude of the force on the child by the seat at the highest point on the circular path?

Two blocks are accelerated across a horizontal frictionless surface as shown.Frictional forces keep the two blocks from sliding relative to each other,and the two move with the same acceleration.If F = 1.2 N and M = 1.0 kg,what is the horizontal component (frictional force)of the force of the small block on the large block?

A boy on board a cruise ship drops a 30.0 gm marble into the ocean.If the resistive force proportionality constant is 0.500 kg/s,what is the terminal speed of the marble in m/s?

A space station in the form of a large wheel,120 m in diameter,rotates to provide an "artificial gravity" of 3.00 m/s² for persons located at the outer rim.Find the rotational frequency of the wheel (in revolutions per minute)that will produce this effect.

A rock attached to a string swings in a vertical circle.Which free body diagram could correctly describe the force(s)on the rock when the string is in one possible horizontal position?

A hornet circles around a pop can at constant speed once per second in a path with a 12-cm diameter.We can conclude that the hornet's wings must push on the air with force components that are

A highway curve has a radius of 0.14 km and is unbanked.A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping.What is the magnitude of the horizontal force of the road on the car?

An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius.What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?

A car enters a level,unbanked semi-circular hairpin turn of 300 m radius at a speed of 40 m/s.The coefficient of friction between the tires and the road is $\mu$ = 0.25.If the car maintains a constant speed of 40 m/s,it will

An object on the flat bed of a truck that is accelerating along a straight horizontal road.The coefficient of static friction is 0.300 in this case.Of the following choices,which is the lowest value of acceleration that would result in the object sliding on the bed of the truck?

A 1.0-kg block is pushed up a rough 22 $\degree$ inclined plane by a force of 7.0 N acting parallel to the incline.The acceleration of the block is 1.4 m/s² up the incline.Determine the magnitude of the force of friction acting on the block.

If a dense 20.0-kg object is falling in air at half its terminal velocity,what is the drag force on the object at this moment?

A car enters a level,unbanked semi-circular hairpin turn of 100 m radius at a speed of 28 m/s.The coefficient of friction between the tires and the road is $\mu$ = 0.800.If the car maintains a constant speed of 28 m/s,it will

A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m),as shown.At an instant when $\theta$ = 50 $\degree$ ,the tension in the string is 8.0 N.What is the magnitude of the resultant force on the mass at this instant?

What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?

The equation below is the solution to a problem. $\frac { ( 2.00 \mathrm {~kg} ) \left( 8.00 \frac { \mathrm { m } } { \mathrm { s } } \right) ^ { 2 } } { 5.00 \mathrm {~m} } = 6.00 \mathrm {~N} - ( 2.00 \mathrm {~kg} ) \left( 9.80 \frac { \mathrm { m } } { \mathrm { s } ^ { 2 } } \right) \left( \cos 180 ^ { \circ } \right)$ . The best physical representation of this equation is

An airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver.If her speed is 200 m/s at the time,find the radius of the loop.

The equation below is the solution to a problem. $\frac { ( 2.00 \mathrm {~kg} ) \left( 8.00 \frac { \mathrm { m } } { \mathrm { s } } \right) ^ { 2 } } { 5.00 \mathrm {~m} } = 25.6 \mathrm {~N} - ( 2.00 \mathrm {~kg} ) \left( 9.80 \frac { \mathrm { m } } { \mathrm { s } ^ { 2 } } \right) \left( \cos 90 ^ { \circ } \right)$ . The best physical representation of this equation is

A race car traveling at 100 m/s enters an unbanked turn of 400 m radius.The coefficient of (static)friction between the tires and the track is 1.1.The track has both an inner and an outer wall.Which statement is correct?