Answer:
32mi
Explanation:
If 1lb contains 3,500 Cal
It means the number of hours required to burn 3500cal would be;
3500/331 = 10.57hours
But a brisk walk is 3.0 mi/h,
It means a distance of 3.0 × 10.57 mi would be covered = 31.71 miles
32miles{ approximated to the nearest whole}
Note Distance = speed × time
3. Distance is a quantity that is always a vector.
B.
Answer:
effort = 266.66N
VR and efficiency are 8 and 37.5% respectively.
Explanation:
Given data: four pulley system, load = 800 N, Mechanical advantage MA = 3
we have to calculate both velocity ratio and efficiency
If there are n movable pulleys connected to a fixed pulley then
VR =
In the given question there are 4 pulleys in which one must be fixed and 3 movable
Therefore, VR = 2^3 = 8
Also, MA = Load/ effort
⇒ 3= 800/effort
⇒ effort = 266.66N
Also we know that
Efficiency = MA/VR
⇒Efficiency = 3/8 = 37.5%
Therefore, VR and efficiency are 8 and 37.5% respectively.
Answer:
A)
B)
Explanation:
Given:
mass of car,
A)
frequency of spring oscillation,
We knkow the formula for spring oscillation frequency:
Now as we know that the springs are in parallel and their stiffness constant gets added up in parallel.
<u>So, the stiffness of each spring is (as they are identical):</u>
B)
given that 4 passengers of mass 70 kg each are in the car, then the oscillation frequency:
These ions are polyatomic ions. The prefix "poly-" means "many," and the rest of the word "atomic" clearly refers to the atoms themselves. So, if there are two or more atoms in an ion, this ion is polyatomic.