Physics 30

What is the ratio of energy in ultraviolet light with a wavelength of

300 nm compared to orange light with a wavelength of 600 nm?

Emma has a 20 year-old twin named Jane. Emma plans to take a

hypothetical space journey to a distant planet having a mass 3 times greater than Earth. Travelling at the speed of light, Emma’s trip to the planet and back to Earth takes 15 years. Upon her return, Emma discovers that Jane is 65 years old. Which of the following explains the twin’s age difference?

Which of the following best describes the photoelectric effect?

Orange light of wavelength 600 nm shines onto a piece of metal. What is the energy of the light in electron volts?

Fluorine-18 has a half-life of 1.8 hours. If a 2000 g sample of the isotope decays for 5.4 hours, how many grams of fluorine will remain? Round your answer to the nearest whole number.

Which type of radiation consists of high speed electrons?

Which of the following are short-term health effects of a 60 rem

radiation dose received in a short period of time?

Which of the following diagrams best illustrates the release of neutrons in a nuclear fission chain reaction?

What is the mass defect in a nuclear fission reaction that releases

3.09 10 J of energy?

What process creates the energy released by the sun?

Consider the following three situations involving moving objects.

1: A merry-go-round rotating at a constant speed.

2: A truck moving uniformly backwards as it drags a stuck vehicle

from a hole.

3: A ball moving toward a wall at 7 m/s, bouncing off, and then

moving away at 7 m/s.

Which situation(s) illustrate changes in velocity?

A car accelerates from rest at 5.00 m/s [E] until it reaches a maximum speed of 20.0 m/s[E]. The car then continues travelling eastward with uniform motion. How long will it take the car to travel 100 m [E]?

A pilot flies to a city with an airspeed of 500 km/h against a head wind of 250 km/h. The pilot immediately returns to the starting point flying with the same airspeed but now with a 250 km/h tailwind. On the second day, the pilot flies the same trip with the same airspeed but there is no wind.

How will the time needed to complete the trips compare?

A fishing boat has a velocity of 12 km/h [N] while crossing a lake with a current of 5.0 km/h [W].

What is the displacement of the fishing boat in the first 36 minutes?

In 2012, Felix Baumgartner set a world record for freefall when he

stepped out of a hot air balloon from a height of 39.0 km above the ground. Ignoring air resistance and assuming a constant gravitational field strength during the freefall, how long did it take him to freefall 1.0 km? Round your answer to the nearest second.

(Record your answer in the numeric response section on the answer sheet.)

A skier launches from a ramp with a velocity of 30.0 m/s at an angle of 30.0° above horizontal as shown in the diagram below.

What is the skier’s vertical displacement above the ramp after flying through the air for 2 seconds?

A 12.0 m diameter Ferris wheel completes 20 revolutions in 5.0 minutes.

What is the magnitude of the centripetal acceleration on the outer edge of the Ferris wheel?

A person stands motionless at the equator where the Earth’s diameter is 1.27 10 m and its period of rotation is 1 day. What is the person’s rotational speed relative to the Earth’s centre?

A certain satellite revolves around the Earth in a geosynchronous orbit.

What is the period of the satellite?

A 100 g mass tied to the end of a string is twirled in a vertical circle. If the string breaks when the mass is at the highest point of its motion,which diagram shows the path the mass will follow?

A force of 20 N [E] is acting on a 5.0 kg object causing it to move at a constant velocity of 4.0 m/s [E]. What is the force of friction acting on the object?

Four forces are acting on a wooden block as shown in the diagram below:

What conclusion can be made about the motion of the block? The block will

An unbalanced force accelerates an object at 2 6.0 m/s [E]. What would be the acceleration if the object’s mass is doubled and the applied force tripled?

A 3.0 kg object is acted upon by forces of 20 N [S], 30 N [N], and 25 N [S] simultaneously. What is the object’s acceleration?

A box weighing 98 N is placed on a frictionless ramp which makes an angle of 30° with horizontal.

What is the magnitude of the force, F, acting down the ramp?

NR3. Two forces, F1 and F2 are acting on a fixed point as shown in the diagram.

F=30 N [E], F=42.4 N [N45 W]

What is the magnitude of the resultant force rounded to the nearest newton?

(Record your answer in the numeric response section on the answer sheet.)

A small 10.0 kg communications satellite stranded in space is at rest relative to a space station. The satellite is subjected to the forces shown in the diagram to bring it into the space station cargo bay for repairs.

If the two forces act on the satellite for 10.0 s, what is the magnitude of the displacement during this time?

Which of the following best describes the forces acting on an object that has reached terminal velocity?

What is the increase in the gravitational potential energy of a 5.44 kg backpack carried up a 3.66 m tall flight of stairs?

Freestyle swimming, a regular overhand swimming motion, has several events in the summer Olympics including 50 m, 200 m, 400 m, and 1500 m. Of these four events, which one requires the largest power output?

A cyclist pedals his bike up a hill during a road race and applies the brakes to slow down as he is coasting down the other side.

What is the energy input into the system?

A 400 kg roller coaster car begins its descent on a frictionless track with an initial speed of 2.00 m/s as shown in the diagram below:

What is the car’s speed when it reaches the finish?

A 35.2 g arrow has 117 J of kinetic energy as it is shot at a target. If the arrow loses 45% of its energy before hitting the target, how fast is the arrow travelling upon impact?

A forklift exerts an average force of 29900 N to raise a 1590 kg container of bricks to a height of 2.75 m. How much energy was converted to friction when the forklift raised the bricks?

Rob is taking his snowmobile for repairs and wants to load it into the back of his pickup truck whose box is 0.914 m above the ground. His friend Pete suggests it would be easier to use his 2.44 m long ramp to pull the 215 kg snowmobile up into the box rather than lifting it vertically.

If using the ramp requires an average pulling force of 995 N parallel to the ramp, what is the ramp’s efficiency?

What characteristic must an object have if it has a positive momentum?

A baseball pitcher throws a 0.145 kg baseball towards a batter at

40.0 m/s. If the baseball reaches the batter in 1.80 s, what is its

momentum?

A large truck with a mass of 15000 kg collides head-on with a compact car with a mass of 800 kg. Which of the following best describes the change in momentum during the collision?

A 50 kg object travelling at 6.0 m/s collides with a 25 kg object at rest.The object with the greater mass is at rest after the collision.

What is the magnitude of the velocity of the 25 kg object after the

collision? Round your answer to the nearest m/s.

(Record your answer in the numeric response section on the answer

sheet.)

A car’s front end is designed to fold up and crumple during a collision.Why does this design decrease the force applied to the passengers?

What is the gravitational field strength on the surface of the planet

Mercury that has a mass of 3.301 kg and an average diameter of 4.8794 m

Two identical 0.0185 kg glass marbles are suspended by separate insulated threads. Each marble has an identical uniform positive electrostatic charge of

8 2.0 10 C. Their centers of mass are separated by a distance, d, of 0.050 m.

What is the force of gravity between the marbles?

Which one of the following statements is true?

Which of the following statements about dark matter is FALSE?

Canadian astronaut Chris Hadfield conducted dozens of micro gravity experiments while aboard the International Space Station orbiting Earth. When he was orbiting Earth, which one of the following statements was true?

Which of the following has the largest gravitational field strength?

Which of the following statements about the Earth’s magnetic field is FALSE?

Two identical 1.8 C charges experience a repulsive force of 1.82 N. What distance is separating the two charges? Round to

the nearest metre.

(Record your answer in the numeric response section on the answer

sheet.)