choose the correct statement about acceleration of the object
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When object is in non free fall state. choose the correct statement about acceleration of the object
| A. |
acceleration is less than g. |
|
| B. |
acceleration is zero. |
|
| C. |
acceleration is more than g |
|
| D. |
g =9.8m/s^2 |
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- A ball of mass 0.15 kg is attached to the end of 1.1 m long cord. The ball is swung in a vertical circle. Determine the minimum speed (in m/s) of the ball at the top of the motion so that the ball continues moving in a circle. a. 2.1 b. 4.5 c. 3.3 d. 1.7When throwing a ball straight up, which of the following are correct about the magnitudes of its velocity, v, and its acceleration, a, at the highest point in its path? a. v = 0 and a = 0 b. v and a are both at their maximum values c. v is not zero and a = -9.8 m/s2 d. v = 0 and a = -9.8 m/s2 e. v is not zero and a = 0A spring gun that is mounted at the edge of a 2.0-m-high table launches a steel ball at an angle of 230 above the horizontal with an initial speed of 7.0 m/s. What is the total time of flight of the steel ball? (Assume that g = 9.81 m/s2.) a. 0.80 s b. 0.60 s c. 0.40 s d. 1.0 s e. 1.2 s
- Suppose a ball is thrown straight up and experiences no appreciable air resistance. What is its acceleration just before it reaches its highest point? slightly less than g b. slightly greater than g c. zero d. exactly gA rocket rises straight up from rest with an acceleration of 1.50 m/s2 at which point its engine fails. For the rest of its flight it experiences only gravitational acceleration.1) Make a diagram showing the rocket's initial conditions (height, time and velocity), the conditions of the rocket when its engine fails, the conditions of the rocket at the peak of its flight,and the conditions of the rocket when it has returned to the ground.2) At the moment when the engine fails (50 m from the ground), what is the rocket's height? What is its velocity?3) At the peak of its flight, what is its height? What is its velocity? How much time has elapsedsince its launch?4) When the rocket returns to the ground, how long has it been in flight? How fast is it going?Answer on separate paper. Be sure to show all equations used in symbolic and substitutedform before doing calculationsWhich of the following descriptions corresponds to a ball tossed vertically upward? Air resistance can be neglected. a. The velocity decreases linearly from v_0 to v_f, with v_0>0 and v_f<0. b. The velocity increases linearly from zero to v_f. c. The position first increases linearly and then decreases linearly as a function of time. d. The acceleration decreases linearly from g to zero.
- A 0.2 kg rock is dropped into a lake from a few meters above the surface of the water. The rock reaches terminal velocity in the lake after 5 s in the water. During the final 3 s of its descent to the lake bottom, the rock moves at a constant speed of 4 m/s. Which of the following can be determined from the information given? a. The distance the rock travels in the first 5 s of its descent in the water b. The acceleration of the rock 2 s before it reaches the lake bottom c. The change in potential energy of the rock-Earth-water system during the final 3 s of the rock's descent. d. The speed of the rock as it enters the lake3. One object dropped from the top of a tall building, and one second later a second object is dropped. Neglecting air resistance, the distance between the falling objects will a. Be constant b. Decrease c. Increase d. Depend on their weight e. Depend on the speed of the plane. Explain your reasoning:What are 3 ways an object can have acceleration? Choose the best 3 answer please. 1. Have a high speed 2. Decrease speed 3. Change direction 4. increase speed 5. Remain at rest 6. Have constant velocity
- A rock is falling from the top of a cliff. Which of the following statements is true? a. Speed of the rock decreases and its acceleration remains constant O b. Speed of the rock increases and its acceleration remains constant Oc. Speed of the rock remains constant and its acceleration increases O d. Speed and acceleration of the rock remains constantThe leaning tower of Pisa is 56 m tall. Supposedly Galileo investigated the behavior of falling objects by dropping them from the top of this tower and timing their descent. How long would it take an object to fall 56 m if air effects are negligible? a. 3.33 s b. 3.38 s c. 3.83 s d. 3.88 sWhen does the object have zero acceleration? What is the best answer. A. From 0.9 to 1.5 seconds B. During all of these time intervals C. From 4.7 to 6 seconds D. From 1.9 to 2.3 seconds