Amotorcycle being driven on a dirt path hits a
rock. its 60.-kilogram cyclist is projected over
the handlebars at 20. meters per second into a
haystack. if the cyclist is brought to rest in
0.50 second, the magnitude of the average force
exerted on the cyclist by the haystack is
(1) 6.0 × 10^1 n (3) 1.2 × 10^3 n
(2) 5.9 × 10^2 n (4) 2.4 × 10^3 n

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? a.)mendel’s genetics states laws that are now part of the theory of biological evolution. b.)biological evolution states laws that are part of mendel’s theory of genetics. c.)mendel’s genetics replaced darwin’s entire concept of biological evolution. d.)biological evolution is a law that explains why all genetics exist.