Answer:
5572.8 N
Explanation:
Applying,
F = ma.............. Equation 1
Where F = Force, m = mass of the car, a = acceleration.
We can find a by applying,
v² = u²+2as............. Equation 2
Where v = final velocity, u = initial velocity, a = acceleration, = distance.
From the question,
Given: v = 0 m/s (come to rest), u = 1.7 m/s, s = 0.210 m
Substitute these value into equation 2
0² = 1.7²+2×0.21×a
a = -1.7²/(2×0.21)
a = -2.89/0.42
a = -6.88 m/s²
Also given: m = 810 kg
Substitute these value into equation 1
F = 810(-6.88)
F = -5572.8 N
Hence the force on the bumber is 5572.8 N
Answer:
Explanation:
Given
Electrostatic force between two electrons is equal to weight of one electron
i.e.
where 
are the charge of particles
mass of electron
r=distance between them
Answer:
The Moon does not fall towards Earth right now because Earth rotates itself. The energy from the Earth's own rotation around its axis is gradually tranferred into energy of the Moon's orbital motion. That's why the Earth's rotating speed decreases but the distance to the Moon increases.
Answer:
a. 
b. 
It is asked for 3 quarts of water because it prevents the temperature drop.
Explanation:
Given:
- mass of frozen cheese,
- quantity of water suggested for the given cheese,
- initial temperature of cheese,
- specific heat of cheese,
- initial temperature of water,
a.
- we have specific heat of water,
so now, we use the heat equation to find the amount of heat exchange during the process:
b.
when using 1 quart of water:
It is asked for 3 quarts of water because it prevents the temperature drop.
In graphing enthalpy entropy and state changes the two
variables that are included are amount of heat added and pressure. The answer
is letter D. The rest of the choices do not answer the question above.
