a river flows due east at 1.5 meters per seconds. a motorboat leaves the north shore of the river and heads die south at 2 meters per second. which vector best represents the resultant velocity of the boat relative to the riverbank?

A 0.400 kg object is swung in a vertical circular path on a string 0.500 m long. If its speed is 4.10 m/s at the top of the circle, what is the tension in the string there?

An observer moving toward Earth with a speed of 0.94 notices that it takes 5.2 for a person to fill her car with gas. Suppose, instead, that the observer had been moving away from Earth with a speed of 0.79.How much time would the observer have measured for the car to be filled in this case?

An electron moves at right angles to a magnetic field of 0.109 T. What is its speed if the force exerted on it is 9.00 10-15 N?

Space invaders land on earth. On the invaders' temperature scale, the ice point is at 25 I (I = invader), and the steam point is at 153 I. The invaders' thermometer shows the temperature on earth to be 55 I. Using logic similar to that in Example 1 in the text, what would this...

A spring with 57 N/m hangs vertically next to a ruler. The end of the spring is next to the 12-cm mark on the ruler. If a 3.0-kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks?

Consider a thin 32 m rod pivoted at one end. A uniform density spherical object (whose mass is 4 kg and radius is 3.2 m) is attached to the free end of the rod and the moment of inertia of the rod about an end 69 is Irod = 1 mL2 and the moment of iner- 3 tia of the sphere about its center of...

What is the capacitance of the three concentric metal spherical shells in the figure ? Hint: Can you think of this as a combination of capacitors? R1 = 1 cm R2 = 2 cm R3 = 3 cm

Suppose an object is set sliding, with a speed less than escape velocity, on an infinite frictionless plane in contact with the surface of the Earth, as shown. Describe its motion. (Will it slide forever at a constant velocity? Will it slide to a stop? In what way will its energy changes be...

A sledge with bricks has a total mass of 180.0 kg and is pulled at a constant speed by a rope inclined at 20 degrees above the horizongtal. The sledge moves a distance of 20.0 m on a horizontal surface. The coefficient of kinetic friction betweenthe sledge and surface is 0.500. (a) What is the...