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- A force is acting between the surfaces of these two solid objects where one object is sliding on the surface of another object. The presence of this force makes the object start to slow down. In which direction does this force act in relation to the motion of the object? O This force is acting perpendicular to the velocity of the object. This force is acting in the opposite direction as the velocity of the object. This force is acting at an angle to the velocity of the object. O This force is acting in the same direction as the velocity of the object.a a resistive force of magnitude (kmv - ma) N, where k and a are constants. (a) Show that dv (a – kv) dt %3D (b) If vo is the speed of the particle at time t = 0 s, show that: 1 kvo t In k a - kvPlease answer and solve the question correctly. Thank you!
- A 137 kg boat is trying to go, from the origin (as shown in the figure), straight across the river at a speed 0.7198 m/s in the y-direction. The current in the river, however, flows to the right and apply a net force of 100 N (x-direction). a) What is the position vector of the boat after 2 seconds. b) What is the velocity of the boat after 3 seconds. Vboat,y Initial position of the boat is: Ij = +A B Assuming that the balls are of equal mass and the tracks are of equal length, which ball will get to the end of the track first?A block of mass m is placed on the right side of a cart; the cart and the block are accelerating to the right with acceleration a, and the coefficient of static friction between the cart and the block is µs. The system is sketched below. a Explain qualitatively why the block won't slip and fall if the acceleration of the cart is large enough.
- Problem A new type of force was discovered by physicists with the following expression: a Fnew + Be* + 3x4 where alpha & beta are constants, and x is the position. The expression above was obtained from the interaction of a massless Hig gs Boson (a type of particle) and a black hole. Quantum physicists then decides to design and build a machine that is able to move the Higgs Boson from x2 to x1. How much work should the machine do to achieve this feat? (For simplicity, consider that no energy is lost in the process) Solution To determine the work done we apply the following W = dx Evaluating the above, we get W = | | + e + for the limits from xj to Xf substituting x1 and x2 as the limits, the work done is expressed as W = | | + B X1 ( x15 - x2 )n her? A high diver of mass 63.0 kg Jumps off a board 10.0 m above the water. If her downward motion is stopped 1.80 s after she enters the water, what average upward force did the water exert on her?The center of gravity coincides with the :center of mass إختر أحد الخيارات always .a if the center of mass is at the geometrical .b O center of the body never .c if the acceleration due to gravity is uniform .d over the body if the body has a uniform distribution of mass .e