Other Physics Answers

Calculate the momentum. of a tody which is moving with a velocity of 72km/es and having 8 mass 2500 g

Calculate the momentum. with a of a body which is moving relacity of 9 m/s and having mass 19 19 kg.

An air bubble of 19.4 cm3 volume is at the bottom of a lake 41.5 m deep. The bubble rises to the surface, which is at a temperature of 22.6°C, where its volume becomes 104 cm3 ,before finally bursting out. Assuming the temperature of the bubble to be the same as that of the surrounding water, find the temperature at the bottom of the lake.

Question: Why waves moving speed in gases is lower than solids? Knowing that it is due to the density, but the gases have faster-moving particles that can transfer them faster. Explain, please.

1. When a man stands, his brain is 0.5 m above his heart. When he bends, his brain is 0.4m below his heart, by how much does his blood pressure in his brain change?
2. At what acceleration would you expect the blood pressure in the brain to drop to zero in an erect person ? ( assume there are no body mechanism operating to compensate for such conditions )

X=4i-2j

Y=i+5j

determine; i. the magnitude of x+y

ii. x-4y

the unit vector _y^{^}

the cartesian coordinates of a point are given by (x,y)=(-2.5,-3.5) meters. Find the polar coordinates of this point?

 A particle undergoes three consecutive displacements: d1 = (15 j+ 30 j+ 12 k) cm,

d2 = (23 i - 14 i -5.0 k) cm and d3 = (-13i + 15 j) cm. Find the components of the resultant displacement and its magnitude.

Microwaves are part of the electromagnetic spectrum. Describe how food is cooked in a microwave. [

The average intensity of sunlight,𝑆̅ at the upper atmosphere is approximately1400𝑊𝑚−2. The average distance between Earth and the Sun is1.50 × 1011 𝑘𝑚, and the mean radius of Earth is 6370 𝑘𝑚.

a) Calculate the amplitudes of the electric and magnetic fields in the sunlight

b) Calculate the average power generated by the Sun

c) Calculate the total power intercepted by Earth