11. How much time does it take for a bird flying at a

speed of 54 km/h to travel a distance of 1,080

kilometers?

a. 30 km/h

b. 30 h

c. 20 km/h

d. 20 h

A 210W heater is placed in 2kg of water and switched on for 200 seconds. a. How much energy is needed to raise the temperature of 2kg of water by 10C? b. How much energy does the heater supply?

What does it mean if an experiment is replicable? Why is it important that experiments be replicated?

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 510 m away measures the angle of elevation to the spot of light to be 45°.

A sound wave enters a new medium where sound travels faster. How does this affect the frequency and wavelength of the sound? A. The frequency increases and the wavelength decreases. B. The frequency decreases and the wavelength increases.

A 25.0 g marble sliding to the right at 20.0 cm/s overtakes and collides elastically with a 10.0 g marble moving in the same direction at 15.0 cm/s. after the collision, the 10.0 g marble moves to the right at 22.1 cm/s. find the velocity of the 25.

How would you sketch the path of boat of a speed of 3 m/s?

What makes the If different from the superego

How do you determine the density of an empty plastic jug?

What formula relstes work n power

What type of invention is created to increase profits