Un pasager a intarziar la tren. ajuns pe peron a observat trenul in miscare si a constatat ca unul dintre vagoane a trecut prin fata sa in intervalul de timp t1=6,6s, iar vagonul al doilea in t2=6s. considerand miscarea trenului rectilimie uniform variata, sa se determine:
a) intervalul de timp τ cu care a intarziat pasagerul
b) intervalul de timp t3 in care prin fata sa trece vagonul urmator

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

This punnett square shows the cross between two pants. one parent has round seeds (rr). and the other parent has wrinkled seeds (rr) which best describes their offspring as shown in this cross?