Answer: making sure that they are up to date
Explanation:
Answer:
h=32.1 km
Explanation:
<em>solution:</em>
using newton law of gravitational attraction and newton second law:
r= distance between two masses
at sea level
a=g
.............................(1)
.........................(2)
by substituting (2) and (1) 
acceleration due to gravity at a distance r from the centre of the earth in terms of g (sea level)
so the weight of the object at a distance r from the centre of the earth (W=ma)
W=mg(Re^2/r^2)..........(3)
h the height above the surface of the earth: r=Re+h
putting the value of r in eq (3)
W=mg(Re/Re+h)^2
W=0.99 mg
solving for height h:
h=Re(1/√0.99)-(1))
h=32.1 km
Answer:
r₂ = 1.5 ft
t = 0.75 s
Explanation:
W = 4 lb ⇒ m = W/g = 4 lb / 32.2 ft/s² = 0.12 slug
v₁ = 6 ft/s
r₁ = 3 ft
v₂ = 12 ft/s
r₂ = ?
t = ?
vr = 2 ft/s
Conserving angular momentum we have:
m*v₁*r₁ = m*v₂*r₂ ⇒ r₂ = v₁*r₁ / v₂
⇒ r₂ = (6 ft/s*3 ft) / (12 ft/s) = 1.5 ft
Now, we get the time as follows:
vr = <em>d</em> / t ⇒ t = <em>d</em> / vr
where <em>d</em> is
<em>d</em> = Δr = r₁ - r₂ = 3 ft - 1.5 ft = 1.5 ft
finally
t = 1.5 ft / 2 ft/s
⇒ t = 0.75 s
Explanation:
1. A sequence of instructions is stored in memory.
2. The memory address wherever the first instruction is found is copied to the instruction pointer.
3. The CPU sends the address within the instruction pointer to memory on the address bus.
4. The CPU sends a “read” signal to the control bus.
5. Memory responds by sending a copy of the state of the bits at that memory location on the
data bus, that the CPU then copies into its instruction register.
6. The instruction pointer is automatically incremented to contain the address of the next
instruction in memory.
7. The CPU executes the instruction within the instruction register.
8. Go to step 3
Steps 3, 4, and 5 are called an instruction fetch. Notice that steps 3 – 8 constitute a cycle, the instruction execution cycle. It is shown graphically below.
A DMA controller can generate memory addresses and initiate memory read or write cycles. It contains several hardware registers that can be written and read by the CPU. These include a memory address register, a byte count register, and one or more control registers.
Answer: Gasoline cars are bad because
Explanation: They give off carbon emissions and pollute the ozone layer causing the greenhouse effect which leads to global warming
