Sirius A has a luminosity of 26 LSun and a surface temperature of about 9400 K. What is its radius?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.

Why do metals "give up" their valence electrons?

Do you think you could give me the answers to #29?