Answer:
0.4 km/h
Explanation:
Speed is defined as distance moved per unit time and can be expressed in either m/s or Km/h or miles/h
Mathematically,
where d represent distance covered and t is time taken
Taking d as 100 m and converting it into km, we divide by 1000 hence d= 0.1 km
Time is 15 minutes and to convert to hours we divide by 60 hence 0.25 hours
Speed,
Therefore, the speed is equivalent to 0.4 km/h
Answer:
The answer is
D. 1230j
Explanation:
When a bullet is shot out of a gun the person firing experiences a backward impact, which is the recoil force, while the force propelling the bullet out of the gun is the propulsive force
given data
Mass of gun M=10kg
Mass of bullet m=20g----kg=20/1000 =0.02kg
Propulsive speed of bullet = 350m/s
Hence the moment of the bullet will be equal and opposite to that of the gun
mv=MV
where V is the recoil velocity which we are solving for
V=mv/M
V=0.02*350/10
V=7/10
V=0.7m/s
The energy contained in the bullet can be gotten using
KE=1/2m(v-V)²
KE=1/2*0.02(350-0.7)²
KE=1/2*0.02(349.3)²
KE=1/2*0.02*122010.49
KE=1/2*2440.20
KE=1220.1J
roughly the energy is 1230J
<span>Hey there!
Awesome question=)
Siobhan can place it on a regular scale(0 gravity area), or she can use the "balance scale"
</span>
I hope this helps;)
Answer:
10.25 seconds
Explanation:
Divide 400/39, leaves you with how many seconds it takes to travel that distance.
It's nice that this problem has everything in meters already, so that you don't have to do any unit conversions.