So we want to know what is the age of igneous rock if it contains one half of its original amount of potassium 40. The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed. And its age is 1.251*10^9 years or 1.251 billion years.
Answer:
1.199km/h towards west
2.17km/h towards upstream direction
3.702km/h towards east
4.2km/h towards downstream direction
5.a.149km/h towards east
b.1043km
Explanation:
1.V p,e = Vp,w + Vw,e
= 211km/h-12km/h
=199km/h towards west
2. Vb,o=Vb,r+Vr,o
Vb,o=22-5km/h
=17km/h towards upstream direction
3.Vj,w= Vj,e + Ve,w
Vj,w = 740-38km/h
= 702km/h towards east
4.Vk,r= Vk,e+ Ve,r
Vk,r=33 - 31km/h
=2km/h towards downstream direction
5.a.Vp,e=Vp,w +Vw,e
Vp,e=216-67km/h
=149km/h towards east
b. distance =speed * time
= 149km/h * 7h
=1043km
[V p,e-velocity of plane relative to earth(ground)]
[p-plane ,w-wind ,e-earth, b-boat, r-river, o-object, j-jet, k-kayaker,]
The answer & explanation for this question is given in the attachment below.
Given.
force = 16.88 N is
radius = 0.340m
an angular acceleration = 1.20rad/s^2
the formula for torque is
F*r = I*a
where I is moment of inertia
16.88*.34 = I*1.2
I = 4.78Kg-m^2
so rotational inertia I = 4.78Kg-m^2