(Solved):   4 ques. please fast. Correct answers only 1. The velocity v of a particle moving on the h ...

 

4 ques. please fast.

Correct answers only

1. The velocity v of a particle moving on the horizontal axis is given by a function of time t as: v=4-3²2² where v is in meters per second and is in seconds. At time / = 0 s, the particle is at x = meters. Consider the direction to the right as the positive x direction. Which of the following is true about the particle at time t = 2.0 s? It is at the right of its initial position and is slowing down. It is at the right of its initial position and is speeding up. It is at the left of its initial position and is speeding up. It is at its initial position and is speeding up. 2. A 1.2 kg stone is tied to a string and swung in a vertical circle with a radius of 0.75 m. The string can withstand a tension of 40.0 N. At what maximum speed can the stone move at the bottom of its path without the string breaking? 0.95 m/s 4.2 m/s 5.0 m/s 5.7 m/s 3. A 6.8 kg object is moving along a rough horizontal surface at a constant speed of 2.0 m/s. It is being pushed across by a horizontal force F. At a certain position x = (0.0 m, the magnitude of the horizontal force Fis varied given by the graph below. F (N) 15.0 10.0 4.0 10.0 x (m) While the horizontal force is increased, the magnitude of the friction acting on the object remains the same. What is the speed of the object at x = 10.0 m? ? 3.4 m/s ? 4.0 m/s ? 6.4 m/s 6.7 m/s 4. Consider the circuit below. 8.00 ? ? 5.00 V 10.0Q2 What is the power dissipated by the 10.0 2 resistor? 0.900 W 1.23 W 1.37 W 1.54 W 12.0 ? M 7.00 V