Answer:
A. At warm tempetures, molecules move around more.
Explanation:
I'm at k12 and I just took the test got it right. Physical Science: Unit 2 Test
Answer:
149,700,000 km (= 1.50 x 10⁸ km)
Explanation:
Given,
Speed of light, c = 300,000 km/s
Time Taken = 8 min 19 s = 499 seconds
Recall, Distance = Speed x Time
= 300,000 km/s x 499 s
= 149,700,000 km
= 1.50 x 10⁸ km
Answer:
B. Arsenic
Explanation:
76 - 43 = 33 protons
on a periodic table element 33 is Arsenic
Answer:
Explanation:
The impulse-momentum theorem states the impulse on an object is equal to the change in momentum of that object. Momentum is given by 
. Since mass is constant, the train's change in momentum is:
(two significant figures).
Impulse is also given as 
, where 
is the average force applied and 
is change in time. Since 
is given as 
, we have the following equation:
(two significant figures).
