Answer:
ans: 4.34 × 10^(-9) N
Explanation:
mass of Mya say (m) = 65 kg
mass of spaceship say (M) = 1600 kg
universal gravitational constant(G) =6.67 × 10^(-11) Nm²/kg²
separation distance (d) = 4m
so,
gravitational force (F)= GMm/d²
=( 6.67 × 65 × 1600) / ( 10¹¹ × 4²)
= 4.34 × 10⁴ / 10¹³
= 4.34 × 10^(-9) N
Explanation:
In short, when we switch off a branch, the remaining branch still forms a complete circuit with the battery, so electricity still pass through the remaining branch.
Technically speaking, the voltage in each branch is the same, and the resistance of the light bulb remains unchanged (neglect effect of temp.) by V=IR, the current should remain unchanged after switching off the other branch.
Answer:
<h2>
30 miles/hour, and 2.24 miles/hour</h2>
Explanation:
What is average speed?
It is the total distance traveled divided by the time taken to cover the total distance traveled
Given that the various distances are
20 miles and 10 miles
the total distance traveled is 20+10= 30 miles
the average speed is expressed as
average speed= total distance/time taken
average speed= 30/1
average speed= 30 miles/hour
The average velocity is a vector quantity
the velocity is the average displacement divided by time taken
average velocity= displacement / time
average velocity= 2.24 /1
average velocity= 2.24 miles/hour
Answer:
-0.4 m/s
Explanation:
We can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the shell + cannon system must be conserved.
Before the shot, the total momentum of the system is zero:
p = 0
After the shot, the total momentum is:
where
m = 3.0 kg is the mass of the shell
v = 200 m/s is the velocity of the shell
M = 1500 kg is the mass of the cannon
V is the recoil velocity of the cannon
Since momentum is conserved, the initial and final momenta must be equal, therefore:
Where the negative sign indicates that the cannon moves in the opposite direction to the shell.