1. Suppose that a car at rest begins accelerating at a constant rate of 15ft/sec2. (a) Determine how many seconds it takes for the car to reach a velocity of 60mph. (b) Determine how far the car has moved in feet once it reaches the desired velocity.

A dog runs at 0.85 m/s of velocity towards a cat which stays at rest. The dog accidently collides with the cat and they move in different directions. The dog moves at 0.22 m/s with 47° after the collision. The mass of the dog is 0.13 kg and the mass of the cat is 0.11 kg. Find the magnitude of velocity of the cat after the collision.

A motorcycle starts from rest at t = 0 and travels along a straight road with a constant acceleration of 7 ft/s2 until it reaches a speed of 60 ft/s. Afterwards it maintains this speed. Also, when t = 0, a car located 8,000 ft down the road is traveling toward the motorcycle at a constant speed of 40 ft/s. A) Determine the time when they pass each other. B) Determine the distance traveled by the motorcycle when they pass each other.

A 1400-kg automobile starts from rest and travels 400 m during a performance test. The motion of the automobile is defined by the relation x= 4000 ln(cosh 0.03t), where x and t are expressed in meters and seconds, respectively. The magnitude of the aerodynamic drag is D = 0.35v2 , where D and v are expressed in newtons and m/s, respectively. Determine the power dissipated by the aerodynamic drag when (a) t= 10 s, (b) t= 15 s.

Task II Samir tests his new motorcycle by racing with Ahmad. Both start from rest, but Samir leaves the starting line 2.00 s after Ahmad does. Ahmad moves with a constant acceleration of 3.0 m/s2, while Samir maintains an acceleration of 4.0m/s2. Find the time at which Samir overtakes Ahmad, the distance that Samir travels before catching Ahmad, and the velocity of both cars at the instant Samir overtakes Ahmad.

A constant force F acts on block 1 with mass m and block 2 with mass 2m. How does the acceleration of block 1 compares to the acceleration of block 2 O a. the acceleration of block 1 is double the acceleration of block 2 Ob.the acceleration of block 1 is equal the acceleration of block 2 Oc. the acceleration of block 1 is half the acceleration of block 2

Dynamics

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The motion of a train of mass 340M8 is opposed by a tractive resistance to motion of 190N/Mg. The train covers a total distance of 800m while accelerating during 1.5min on its way up an incline of 1 in 140 from an initial speed of 18km/h Analyse the motion and calculate: • The magnitude of the tractive resistance to motion in N: N • The speed of the train after 1.5min up the incline, m/s The acceleration of the train, a = m/s? • The force delivered from the train engine to achieve the acceleration, Fdr = • The power output at the instant the train reaches 800m, P = W Assume the power is witched off immediately after the train has reached 800m, analyze the further part of the motions and calculate: • how long, after the initial 1.5 min will the train still move up the incline before stopping, assuming the same tractive resistance to motions with no brakes applied, At = • Calculate the variation of the potential and kinetic energies between the initial instant at 18 km/h and the moment…

O 4. Moves downward at constant speed. QUESTION 20 A box of mass 400 kg is supported on a spring scale on the floor of a goods lift. The mass of the lift is 1900 kg. The lift is travelling from the 20th floor to the ground floor. At an instant when the deceleration of the lift is 1.2 ms 2 as it approaches the ground floor, what is the reading recorded by the scale? O 1.351 kg O 2.387 kg O 3.449 kg O 4.461 kg Click Save and Submit to save and submit. Click Save All Answers to save all answers.