Answer:
78.498N
Explanation:
The Net force provided by the spinnaker can be obtained from Newton's second law of motion as follows;
where m is the mass, v is the final velocity, u is the initial velocity and t is the time interval for which the force acted.
Given;
m =980lb
v = 12mi/h
u =8mi/hr
t = 10s.
It is important to convert all quantities to their SI units where necessary, so we do that as follows;
1lb = 0.45kg,
hence 980lb = 980 x 0.45kg = 441kg.
1mile = 1609.34m
1hour = 3600s,
therefore;
Substituting all values into equation (1), we obtain the following;
The answer is D. Mass, brightness and size are used to measure the physical properties of the stars. One is the brightness it is a combination of the intrinsic brightness of a star. Second is the size is calculated using the Stephan's Law. And the third is the mass, astronomers use the Stellar mass to describe the mass of the stars.
Answer:
6.51 g/c.c
Explanation:
mass, m = 114 g
initial volume, V1 = 25 mL
final volume, V2 = 42.5 mL
Volume of the metal piece, V = V2 - V1 = 42.5 - 25 = 17.5 mL
1 mL = 1 c.c
So, Volume of metal, V = 17.5 c.c.
Let the density of the metal is d.
density = mass / volume
d = 114 / 17.5 = 6.51 g/c.c
Thus, the density of metal is 6.51 g/c.c.
Calculating the resisting force against the object in motion.
The answer is A a change in time
