ENG Science/Physics 1A PASS Mid-Tri Exam Buster

This is the Mid-Tri Exam Buster! There are 2 types of questions: multiple choice and short answers. Please note that answers will be provided at one of our exam buster sessions on (Gold Coast, Nathan and Online). Check Microsoft Teams and emails regularly to see the time and locations of each session.

• The correct answer

• The first answer is incorrect

• The answer to the right is not correct

• The 2nd answer is correct

A car initially at rest begins to accelerate, reaching a top speed of 67.0 km/hr in 6.53 seconds. Calculate the average acceleration of the car:

• 1.0 x 10⁴ m/s²

• 2.85 m/s²

• 10.3 m/s²

• 170 m/s²

A soccer ball is kicked horizontally off a 21.0m hill and lands a distance of 45.0m from the edge of the hill. What is the initial velocity of the soccer ball?

• 0 m/s

• 9.8 m/s

• 10.5 m/s

• 14.8 m/s

• 21.7 m/s

Jess is testing a prototype jetpack. The free-body diagram attached shows the forces exerted on Jess by a jetpack. Given that she is accelerating at 8 m/s², what's her mass?

• 37.5kg

• 50kg

• 62.5kg

• 72.5kg

A graph of the force on an object as a function of its position is shown in the figure. Determine the amount of work done by this force on an object that moves from x = 1.0m to x = 5.0m.

• 8.1 J

• 12.6 J

• 15.0 J

• 18.0 J

• 20.0 J

A practicing archer fires and arrow at 80 m/s at an angle of 30° above the horizontal. A short time later, they fire a second arrow at 60 m/s at an angle of 60°. What is the difference in the flight distance between the two arrows in metres?

Alice and Bob are ice-skating together. Alice skates at 4m/s EAST while Bob, who is new at ice-skating, travels at 2.5m/s WEST. Bob loses control and skates into Alice, and they grab hold of each other to avoid falling to the ground. Given Alice weighs 55kg and Bob weights 70kg:

a) Draw diagrams to represent Alice and Bob's motion before and after the collision.

b) What type of collision is this?

c) Find Alice and Bob's final velocity

A crane from a building site lifts a 250 kg steel girder 35 m into the air.

a) Calculate the potential energy gained by the girder.

b) A cable holding the girder breaks while it is 35 m above ground. What is the velocity of the girder as it hits the ground?

c) How long does it take to reach the ground?

d) If the crane takes 18 seconds to lift the girder to its max height, calculate the power used for the lifting.

Lee is flying a 14300 kg Boeing-747 airplane at an altitude of 497 m and a velocity of 214 km/h. Calculate the total mechanical energy fo the plane and express your answer in SI units.

A 5 kg block is pulled along a ramp by a force F = 70 N as shown. If the coefficient of friction between the block and ramp is μ_k= 0.4 . what is the acceleration of the block?