math and calculations

Question 1

The harmonic wave is described by equation: 2m⋅sin(3⋅t−2⋅x) . Which of the following
is true?
a. wavelength is equal …
b. period is equal ….
c. velocity is equal …
d. amplitude is equal …

Answer 1

Question 2

The velocity of the wave of frequency 20Hz and wavenumber 31.4 1/m is

Answer 2

Question 3

A bat is flying with velocity of 10 m/s. What frequency of sound emitted by this bat will be heard by other bat sitting on the tree. The bat is emitting a sound of frequency 34 kHz. The sound velocity in the air is 334 m/s.

Answer 3

Question 4

The cheetah can run with velocity 130 km/h and achieve it in 3s. Find the acceleration. The result present in standard SI units.

Answer 4

Question 5

The equation of the wave is y(x,t)=3 sin(2x -4t). The period of this wave is

Answer 5

Question 6

The pigeon is flying with the velocity of 60 km/h. Assuming that it is flying without the rest
how long would it fly across Europe (1200km)?

Answer 6

Question 7

A bird is dropping a nut at the height of 4m? What is the velocity of the nut at the ground?

Answer 7

Question 8

A bird is dropping a nut at the height of 4m? How long will it be falling?

Answer 8

Question 9

A bull running with the velocity of 10 km/h is jumping in onto the standing platform. The
mas of bull is 600 kg and platform m=400 kg. Find the velocity of the platform after the bull
stops on it.

Answer 9

Question 10

The refraction coefficient is equal n=1.3. The incoming beam is at angle 25*. The refracted
beam will be at the angle:

Answer 10