Physics.02

Which object reaches the longest range? A. B. Object launched at 60 0 C. Object launched at 450 D. Object launched at 150

• Object launched at 75 degrees

• Object launched at 60 degerees

• Object launched at 450 degrees

• Object launched at 150 degrees

Which statement is correct about the time of flight of the projectile release in different angles?

• Projectile launched at 15 degrees has the shortest time of flight

• Projectile launched at 45 degrees has the shortest time of flight

• Projectile launched at 75 degrees has the shortest time of flight

• Projectile launched at 90 degrees has the shortest time of flight

A cannon is fired horizontally from the top of a 50m cliff into the ocean. The initial velocity of the cannon was 800m/s. How long will it take for the cannon to hit the water?

• 3.19 s

• 4.9 s

A cannon is fired horizontally from the top of a 50m cliff into the ocean. The initial velocity of the cannon was 800m/s. How far from the cliff does the cannon ball hit the water?

• 3.21 m

• 15.62 m

A ball is kicked with an initial velocity of 15m/s at angle of 60° to the horizontal. How long will the ball stay in the air? (Time of flight) (assume it strikes the ground at the same height it was launched)

• 1.50 s

• 2.65 s

A ball is kicked with an initial velocity of 15m/s at angle of 60° to the horizontal. How far will the ball go before hitting the ground? (Range (dx))

• a. 9. 80 m

• 19.88 m

A ball is kicked with an initial velocity of 15m/s at angle of 60° to the horizontal. What will be the maximum height of the ball? (dymax)

• 8.61 m

• 9.80 m

Why is a generator needed in power plants? What is the main role of a generator in electricity production?

• It burns fuel to create energy

• It converts mechanical energy into electrical energy.

Why is electricity transmitted at high voltage instead of low voltage?

• High voltage reduces energy loss

• High voltage is cheaper to produce low voltage.

What would happen if there were no step-down transformers? If electricity were sent directly to homes at high voltage what would happen?

• Households would receive less electricity than needed.

• Electrical devices could be damaged or cause fires