The object's kinetic energy changes according to
d<em>K</em>/d<em>t</em> = 15 J/s
If <em>v</em> is the object's initial speed, then its initial kinetic energy is
<em>K</em> (0) = 1/2 (5 kg) <em>v</em> ²
Use the fundamental theorem of calculus to solve for <em>K</em> as a function of time <em>t</em> :
After <em>t</em> = 13 s, the object's kinetic energy is
<em>K</em> (13 s) = 1/2 (5 kg) (13 m/s)² = 422.5 J
Put this as the left side in the equation above for <em>K(t)</em> and solve for <em>v</em> :
==> <em>v</em> ≈ 9.5 m/s
Answer :
The frictional force on the block from the floor and the block's acceleration are 10.45 N and 0.73 m/s².
Explanation :
Given that,
Mass of block = 3.50
Angle = 30°
Force = 15.0 N
Coefficient of kinetic friction = 0.250
We need to calculate the frictional force
Using formula of frictional force
(II). We need to calculate the block's acceleration
Using newton's second law of motion
Hence, The frictional force on the block from the floor and the block's acceleration are 10.45 N and 0.73 m/s².
Answer:
7.77 x 10⁸ Km
Explanation:
given,
Speed of light = 3 x 10⁵ Km/s
= 3 x 10⁸ m/s
1 light hour = 1.079 x 10⁹ Km
now,
0.72 light hour = 0.72 x 1.079 x 10⁹ Km
= 0.7769 x 10⁹ Km
= 7.77 x 10⁸ Km
The Jupiter is 7.77 x 10⁸ Km far from sun.
Answer:
20 m
Explanation:
mechanical adv = distance over which the effort is applied (de) / distance the load travels (dr)
MA = de/ dr
10 = de/ 2
de = 20 m
If the roadway is wet and the cars starts to skid, one should slow down by shifting to lower gear. The correct option is B.
<h3>What are gears?</h3>
A gear is component used to transmit motion. They are used in cars, trucks, machines, bicycles, etc.
For a car to avoid skidding on the wet roads, one must drive the car slowly. This can be done by shifting the gear to the lower one. This will help car to keep balance when brakes are applied on wet roads.
Thus, the correct option is B.
Learn more about gears.
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