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HW Chapter 3 3.3 A web page designer creates an animation in which a dot on a computer screen has a position of r = [4.0 cm + (2.5 cm/s2) t2] i + (5.0 cm/s)t j. a) Find the magnitude and direction of the dots average velocity between t = 0 and t = 2
Chapter 2 2.10 A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min it starts to rain and she returns home. Her distance from her house as a function of time is shown in Fig. 2.29. At which of the labeled point
HW Chapter 4 4.11 A hockey puck with mass 0.160 kg is at rest at the origin (x = 0) on the horizontal, frictionless surface of the ring. At time t = 0 a player applies a force of 0.250 N to the puck, parallel to the x-axis; he continues to apply this
HW Chapter 5 5.15 Atwoods Machine. A 15.0-kg load of bricks hangs from one end of a rope that passes over a small, frictionless pulley. A 28.0-kg counterweight is suspended from the other end of the rope, as shown in Fig. 5.47. The system is released
HW Chapter 8 8.7 Force of a Golf Swing. A 0.0450-kg golf ball initially at rest is given a speed of 25.0 m/s when a club strikes. If the club and the ball are in contact for 2.00 ms, what average force acts on the ball? Is the effect of the balls wei
HW Chapter 7 7.10 Jumping Flea. High-speed motion pictures (3500 frames/second) of a jumping 210 g flea yielded the data to plot the graph shown in Fig. 7.26. This flea is about 2 mm long and jumped at a nearly vertical take-off angle. a) Find the ma
HW Chapter 6 6.8 A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a constant force F = (30 N)i (40 N)j to the cart as it undergoes a displacement s = (-9.0 m)i - (3.0 m)j. How much work does the force you apply do on
HW Chapter 10 10.6 In Fig. 10.42, the forces A, B, C, and D each have magnitude 50 N and act at the same point on the object. a) What torque (magnitude and direction) does each of these forces exert on the object about point P? b) What is the total t
HW Chapter 13 and Chapter 14 13.6 In a physics lab, you attach a 0.200-kg air-track glider to the end of an ideal spring of negligible mass and start it oscillating. The elapsed time from when the glider first moves through the equilibrium point to t
HW Chapter 9 9.8 A wheel is rotating about an axis that is in the z-direction. The angular velocity z is 6.00 rad/s at t = 0, increases linearly with time and is +8.00 rad/s at t = 7.00 s. We have taken counterclockwise rotation to be positive. a) Is
PHYSICS 4B Chapter 22 22.2 The cube in Fig. 22.32 has sides of length L = 10.0 cm. The electric field is uniform, has a magnitude E = 4.00103 N/C, and is parallel to the xy-plane at an angle of 36.9 measured from the +x-axis toward the +y-axis. a) Wh
PHYSICS 4B Chapter 21 21.17 Three point charges are arranged along the x-axis. Charge q1 = +3.00 C is at the origin, and charge q2 = -5.00 C is at x = 0.200 m. Charge q3 = -8.00 C. Where is q3 located if the net force on q1 is 7.00 N in the x-directi
PHYSICS 4B Chapter 23 23.3 A small metal sphere, carrying a net charge of q1 = -2.80 C, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q2 = -7.80 C and mass 1.50 g, is projected toward q1. W
PHYSICS 4B Chapter 24 24.6 A 10- F parallel-plate capacitor is connected to a 12.0 V battery. After the capacitor is fully charged, the battery is disconnected without loss of any of the charge on the plates. a) A voltmeter is connected across the tw
PHYSICS 4B Chapter 25 25.3 Copper has 8.5 10 free electrons per cubic meter. A 71.0-cm length of 12-gauge copper wire, that is 2.05 mm in diameter, carries 4.85 A of current. a) How much time does it take for an electron to travel the length of the w