Weight is mass x gravity, so you'd multiply the mass of the astronaut by the gravitational pull.
Answer:
C
Explanation:
through the desk....here desk is the student's medium to hear the sound. its oblivious because when he lifts his head away from the desk he hears nothing else
Complete Question
The complete question is shown on the first uploaded image
Answer:
Explanation:
From the question we are told
The amplitude of the lateral force is 
The frequency is 
The mass of the bridge per unit length is 
The length of the central span is 
The oscillation amplitude of the section considered at the time considered is 
The time taken for the undriven oscillation to decay to
of its original value is t = 6T
Generally the mass of the section considered is mathematically represented as

=> 
=> 
Generally the oscillation amplitude of the section after a time period t is mathematically represented as

Here b is the damping constant and the
is the amplitude of the section when it was undriven
So from the question

=> 
=> 
=> 
=> 
Generally the amplitude of the section considered is mathematically represented as

=> 
=> 
=> 
=> 
as it is given that curved marked the speed as v = 70 km/h
so we will first convert the speed into m/s

now we know that here friction force will provide centripetal force

As we know that centripetal force is given as







You have to figure it out