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A 30.0-kg packing case is initially at rest on the floor of a 1500-kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic friction is 0.20. Before each acceleration given below, the truck is traveling due north at constant speed. Find the magnitude and direction of the friction force acting on the case
(a) When the truck accelerates at 2.20 m/s' northward and
(b) When it accelerates at 3.40 m/s2 southward.
After falling from rest from a height of 26 m, a 0.5 kg ball rebounds upward, reaching a height of 16 m. If the contact between ball and ground lasted 1.6 ms, Evaluate average force was exerted on the ball?
A mass of 60.2 g of an element is known to contain 9.42 x 1023 atoms. What is the atomic mass of the element
find capacitance of a paraell-plate capacitor with area 34_cm^2, seperation distance 0.72_mm an dielectric with constant 2.5. use 8.85 x 10^-12 C^2/N*m^2
An object is placed 5 cm in front of a spherical mirror. A virtual image is formed 10 cm behind the mirror. What is the magnification of the mirror
A vertical scale on a spring balance reads from 0 to 195 rm{N}. The scale has the length of 11.5 rm{cm} from the 0 to 195 rm{N} reading. A fish hanging from the bottom of spring oscillates vertically at a frequency of 2.30 rm{Hz}. What is the m of..
the focal point of a convex mirror is 4.0 m behind the mirror. a woman stands 2.0m in front of the mirror. what is the distance between the woman and her image
Consider two points charges held fixed at locations along the x-axis. Charge q1= 5.00mC is located at x1= 1.00m. Charge q2= -5.00 mC is located at x2=4.00m. calculate the magnitude and direction of the electrostatic force
The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.64 m, Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point
Two carts have a compressed spring between them and are initially at rest. One of the carts has total mass, including its contents, of 7.0 kg, and the other has total mass of 5.0 kg. If the 5.0 kg cart is moving at 3.0 m/s after the spring is allowed..
a small motor draws a current of 1.75 A from a 120.0 V line. It costs $35.81 to operate the motor for 4.00 hrs at $0.0600 /kWh. What is the power output of the motor
A circuit contains two elements, but it is not known if they are L, R or C. The current in this circuit when connected to a 9.30×101 V, What is the power dissipated in the circuit
An ammeter with an internal resistance of 51.0 ? measures a current of 5.05 mA in a circuit containing a battery and a total resistance of 1390 ?. Determine the actual value of the current
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