How much force is needed to push a 20kg at 0.2 m/s/s A)10 N B)20 N C)4 N D)40 N

Can cars stop on a dime? Calculate the acceleration of a 1400 kg car if it can stop from 35 km/h on a dime (diameter= 1.7 cm) ho

Deffense [45]

Answer:

The acceleration of the cart is 283.54g

Explanation:

It is given that,

Initial speed of the car, u = 35 km/h = 9.72 m/s

Finally, it stops, v = 0

Diameter of the dime, d = 1.7 cm

Let a is the acceleration of the car. Using third equation of motion to find it as :

$v^2-u^2=2ad$

$-u^2=2ad$

$a=\dfrac{-u^2}{2d}$

$a=-\dfrac{(9.72)^2}{2\times 1.7\times 10^{-2}}$

$a=-2778.77\ m/s^2$

So, the acceleration of the car is $2778.77\ m/s^2$ and it is decelerating.

Since, $g=9.8\ m/s^2$

So, $a=\dfrac{2778.77}{9.8}=283.54\ g$

So, the acceleration of the cart is 283.54g. Hence, this is the required solution.

6 0

3 years ago

Suppose an electron is moving with a constant velocity until it encounters a positively charged sphere on its right. How does th

umka2103 [35]

Answer:

b. It deflects the electron to the right.

Explanation:

Since the sphere is positively charged and electron has negative charge, it will be attracted toward the sphere and hence,

The electron is deflected to the right as the positively charged sphere on its right

So, the 2nd option is correct.

5 0

4 years ago

find the angle between two forces of magnitude 27N and 30N if the magnitude of the resultant of the two force is 8N

lara31 [8.8K]

Answer:

The angle between two forces is 165 degrees.

Explanation:

We have,

Force 1, $F_1=27\ N$

Force 2, $F_2=30\ N$

Resultant of two forces, F = 8 N

It is required to find the angle between two forces. The resultant of two force is given by the formula as follows :

$F=\sqrt{F_1^2+F_2^2+2F_1F_2\cos\theta}$

$\theta$ is the angle between F₁ and F₂

So,

$F^2=F_1^2+F_2^2+2F_1F_2\cos\theta\\\\\cos\theta=\dfrac{F^2-F_1^2-F_2^2}{2F_1F_2}\\\\\cos\theta=\dfrac{(8)^2-(27)^2-(30)^2}{2\times 27\times 30}\\\\\cos\theta=-0.966\\\\\theta=\cos^{-1}\left(-0.966\right)=165^{\circ}$

So, the angle between two forces is 165 degrees.

6 0

3 years ago

To dry the brakes, drive slowly in __________ and apply light pressure on your brake pedal.

ira [324]

The answer is low gear. To dry the brakes of a vehicle, one must driv slowly in low gear and apply light pressure on the vehicle's brake pedal. Dry brakes are less expensive and are cheap when it needs replacement, yet under pressure they may cause more damage to the system than wet brakes, which are better in terms of emergency.

3 0

3 years ago

Which of the following is most useful to determine how much energy is being used by a circuit in a given amount of time?

user100 [1]

Answer:

The answer is A.

Explanation:

5 0

3 years ago