Phy_Sci_BM3_Practice

Which line on the graph shows the effect of applying brakes on a moving car?

• Line 1

• Line 2

• Line 3

• Line 4

Answer explanation

Line 4 on the graph shows the effect of applying brakes on a moving car as it represents a decrease in speed or deceleration.

Vivian went on a bicycle trip and she rode her bicycle along a long flat road at a constant speed for 24 kilometers (km). The ride took her 1.2 hours (h). At what speed did she ride her bicycle?

• 0.05 h/km

• 20 km/h

• 20 mi/h

• 28.8 km•h

Answer explanation

Vivian rode her bicycle at a speed of 24 km / 1.2 h = 20 km/h. Therefore, the correct answer is 20 km/h.

What is acceleration?

• Acceleration is the rate at which displacement changes.

• Acceleration is the rate at which force changes.

• Acceleration is the rate at which velocity changes.

• Acceleration is the rate at which mass changes.

Answer explanation

Acceleration is the rate at which velocity changes, indicating how quickly the speed or direction of an object is changing over time.

The electromagnetic spectrum shows the wavelength and frequencies of light. How is infrared radiation different from visible light?

• It is invisible and has an amplitude lower than visible light.

• It is invisible and has a longer wavelength than visible light.

• It has a shorter wavelength and lower frequency than visible light.

• It has a longer wavelength and higher frequency than visible light.

Answer explanation

Infrared radiation is invisible and has a longer wavelength than visible light, distinguishing it from visible light.

If the distance traveled by a bus is 250 km in 4 hours 30 minutes, what is its speed?

• 58.14 km/h

• 1075 km/h

• 55.56 km/h

• 55.56 mph

Answer explanation

To find the speed, divide the distance traveled by the time taken: 250 km / 4.5 hours = 55.56 km/h. Therefore, the correct answer is 55.56 km/h.

What are the categories in which FORMS of energy can be placed into?

• Mass and acceleration

• Weak and Strong forces

• Light and Heat

• Kinetic and Potential

Answer explanation

Forms of energy can be categorized into Kinetic (energy of motion) and Potential (stored energy). Mass and acceleration, Weak and Strong forces, Light and Heat are not categories of energy forms.

An upward force of 10.0 N is applied to an object moving down against a of 2.5 N going down. What is the resultant force on the object?

• 7.5 N down

• 12.5 N down

• 12.5 N up

• 7.5 N up

Answer explanation

The upward force of 10.0 N minus the force of 2.5 N going down results in a net force of 7.5 N up on the object.

A wave travels an average speed of 350 m/s. If the wavelength is 4 meters, what is its frequency?

• 1400 m/s

• 1400 Hz

• 87.5 Hz

• 87.5 m/s

Answer explanation

The frequency of the wave can be calculated using the formula: speed = frequency x wavelength. Therefore, frequency = speed / wavelength = 350 m/s / 4 m = 87.5 Hz.

A 250-Hz sound wave travels at 1100 m/s along a railroad track, what is its wavelength?

• 4.4 m

• 0.227 m/s

• 275000 m

• 0.227 Hz

Answer explanation

The correct answer is 4.4 m because the wavelength can be calculated by dividing the speed of sound (1100 m/s) by the frequency (250 Hz), giving a result of 4.4 m.

The diagram below shows a stationary cart on a frictionless surface. Two unequal opposing forces are about to be applied to the cart. If the unequal opposing forces are applied to the cart at the same time, what will occur?

• The cart will move to the left.

• The cart will move to the right.

• The cart will alternate between moving left and right.

• The cart will remain stationary.

Answer explanation

The cart will move to the right because the unequal opposing forces will result in a net force to the right, causing the cart to accelerate in that direction.