Answer:
Work done by the frictional force is 
Explanation:
It is given that,
Mass of the car, m = 1000 kg
Initial velocity of car, u = 26.1 m/s
Finally, it comes to rest, v = 0
We have to find the work done by the frictional forces. Work done is equal to the change in kinetic energy as per work - energy theorem i.e.
W = −340605 J
or
Hence, the correct option is (a).
Answer: The given statement is True.
Learning means change or modification in the behavior of an individual that is obtained by getting new information, knowledge, skills or different experiences throughout the life.
There can be different learning styles like visual ( using pictures and images), verbal ( like repetition or rehearsal), social ( in groups), logical ( using reasoning) that could be adopted by different individuals.
The information can be memorized through repetition of the information by continuously reading, writing, speaking, and revisiting it.
Answer:
1.27 m/s
Explanation:
The force acting on the sled is F = 6.20 N. Since it is acting at an angle of 35° to the horizontal, its horizontal component which moves the sled forward is Fcos35. This force is the net force on the sled. So,
Fcos35 = ma where m = mass of sled = 4.60 kg and a = acceleration of sled
a = Fcos35/m = 6.20cos35/4.60 = 1.1 m/s².
We now know its acceleration. To find the sleds speed after time t = 1.15 s, we use v = u + at where u = initial velocity of sled = 0 m/s (since it starts from rest)
Substituting the remaining values of a and t into the equation, we have
v = u + at = 0 + 1.1 × 1.15 = 1.27 m/s
So, the sled goes 1.27 m/s fast after 1.15 s
Answer:
Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre. ... Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units).
The density of water is about 1 g/cm3, since the gram was originally defined as the mass of one cubic centimetre of water at its maximum density at 4 °C.
