Q7 A stone is thrown (v₁ = 20 m/s) from the ground with angle 60⁰ above the horizontal. At an instant the x component of the position is 10m what is the height of the stone, y, in m? A) 12.05 B) 6.96 C) 14.64 Q8 In the system, shown in the figure, assume that the surfaces are frictionless, if M = 2.1 kg, calculate the mechanical energy for the mass M before the system starts moving, in J? A) 0.45 B) 0.75 Q12 A student used the experiment, shown in the figure, to find the kinetic friction coefficient, Ha between the mass m and the table (the table is flat). As a result, he found the relation between the normal force (n) and the kinetic friction force (f), as shown in the graph. calculate the kinetic friction coefficient (μ)? A) 42 B) 30 C) 34 D) 38 Q9 Calculate the mechanical energy, in J, for the mass M when the mass 2M hit the ground: A) 38.5 B) 47.6 C) 43.1 D) 34.0 C) 600 C) 1.20 m 5m D) 12.32 M Q10 A 3 kg is hanged vertically at the end of a spring, the spring is stretched 8 cm and become at rest, what is the spring constant, in N/m? A) 375 B) 500 Q11 The energy stored in the spring is, in J? M 2m 1.5m D) 1000 600 D) 0.90 n (N) A) 4.00 B) 2.00 C) 0.50 D) 0.25 Q13 If m= 2kg and M = 7kg calculate the acceleration of the system, in m/s²? A) 7.22 B) 6.88 C) 6.43 D) 5.83 2M 0.4m - F(N)
Angular Momentum
The momentum of an object is given by multiplying its mass and velocity. Momentum is a property of any object that moves with mass. The only difference between angular momentum and linear momentum is that angular momentum deals with moving or spinning objects. A moving particle's linear momentum can be thought of as a measure of its linear motion. The force is proportional to the rate of change of linear momentum. Angular momentum is always directly proportional to mass. In rotational motion, the concept of angular momentum is often used. Since it is a conserved quantity—the total angular momentum of a closed system remains constant—it is a significant quantity in physics. To understand the concept of angular momentum first we need to understand a rigid body and its movement, a position vector that is used to specify the position of particles in space. A rigid body possesses motion it may be linear or rotational. Rotational motion plays important role in angular momentum.
Moment of a Force
The idea of moments is an important concept in physics. It arises from the fact that distance often plays an important part in the interaction of, or in determining the impact of forces on bodies. Moments are often described by their order [first, second, or higher order] based on the power to which the distance has to be raised to understand the phenomenon. Of particular note are the second-order moment of mass (Moment of Inertia) and moments of force.
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