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anygoal [31]
3 years ago
10

A grapefruit has a weight on earth of 4.9 newtons. What is the grapefruit's mass?

Physics
2 answers:
sveta [45]3 years ago
3 0
Weight = mg where m = mass and g = gravity = 10 (9.81....)
so m = w/g = 4.9 / 10(9.81....) = 0.49 (0.49949....)
if you get given g as 10, answer is 0.49 kg 
if you get given g as 9.81, answer is 0.50 (1sf)
igor_vitrenko [27]3 years ago
3 0

Answer:

The grapefruit's mass is 0.5 kg.

Explanation:

Given that,

Weight = 4.9 N

We need to calculate the mass

Using formula of newton's second law

F = mg

m = \dfrac{F}{g}

Where, F = weight on earth

g = acceleration due to gravity

Put the value into the formula

m = \dfrac{4.9}{9.8}

m =0.5\ kg

Hence, The grapefruit's mass is 0.5 kg.

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A toy car having mass m = 1.10 kg collides inelastically with a toy train of mass M = 3.55 kg. Before the collision, the toy tra
kkurt [141]

Answer:

V_{ft}= 317 cm/s

ΔK = 2.45 J

Explanation:

a) Using the law of the conservation of the linear momentum:

P_i = P_f

Where:

P_i=M_cV_{ic} + M_tV_{it}

P_f = M_cV_{fc} + M_tV_{ft}

Now:

M_cV_{ic} + M_tV_{it} = M_cV_{fc} + M_tV_{ft}

Where M_c is the mass of the car, V_{ic} is the initial velocity of the car, M_t is the mass of train, V_{fc} is the final velocity of the car and V_{ft} is the final velocity of the train.

Replacing data:

(1.1 kg)(4.95 m/s) + (3.55 kg)(2.2 m/s) = (1.1 kg)(1.8 m/s) + (3.55 kg)V_{ft}

Solving for V_{ft}:

V_{ft}= 3.17 m/s

Changed to cm/s, we get:

V_{ft}= 3.17*100 = 317 cm/s

b) The kinetic energy K is calculated as:

K = \frac{1}{2}MV^2

where M is the mass and V is the velocity.

So, the initial K is:

K_i = \frac{1}{2}M_cV_{ic}^2+\frac{1}{2}M_tV_{it}^2

K_i = \frac{1}{2}(1.1)(4.95)^2+\frac{1}{2}(3.55)(2.2)^2

K_i = 22.06 J

And the final K is:

K_f = \frac{1}{2}M_cV_{fc}^2+\frac{1}{2}M_tV_{ft}^2

K_f = \frac{1}{2}(1.1)(1.8)^2+\frac{1}{2}(3.55)(3.17)^2

K_f = \frac{1}{2}(1.1)(1.8)^2+\frac{1}{2}(3.55)(3.17)^2

K_f = 19.61 J

Finally, the change in the total kinetic energy is:

ΔK = Kf - Ki = 22.06 - 19.61 = 2.45 J

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Answer:

Explanation:

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Velocity and it direction?

Force in a magnetic field is given as

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Direction of the force

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