All categories

3 years ago

Which of the following best describes gravity?

Physics

1 answer:

Tanzania [10]3 years ago

5 0

Answer:

Explanation:

Gravity will always be attractive because it pulls things not push. For example gravity pull people to earth, that is why we don't float.

You might be interested in

Instructions:Select all the correct answers.

melomori [17]

The answer would be B: The ground exerts an equal force on the golf ball.

6 0

2 years ago

Read 2 more answers

The acceleration due to gravity on the surface of Jupiter is about 2.5 times the acceleration due to gravity on Earth’s surface.

Ann [662]

Answer: The correct answer is option C.

Explanation:

Weight = Mass × Acceleration

Let the mass of the space probe be m

Acceleration due to gravity on the earth = g

Weight of the space probe on earth = W

$W=m\times g$

Acceleration due to gravity on the Jupiter = g' = 2.5g

Weight of the space probe on earth = W'

$W'=mg'=m\times 2.5g$

$\frac{W'}{W}=\frac{m\times 2.5g}{m\times g}$

$W'=2.5\times W$

The weight of the space probe on the Jupiter will be 2.5 times the weight of the space probe on earth.

Hence, the correct answer is option C.

6 0

2 years ago

Determine the value of the current in the solenoid so that the magnetic field at the center of the loop is zero tesla. Justify y

sleet_krkn [62]

Answer:

I will explain the concept of magnetic field and how it can be calculated.

Explanation:

The formula for magnetic field at the center of a loop is given as

B = μ $_{o}$ I / 2R

where B is the magnetic field

R is the radius of the loop

I is the current

and μ $_{o}$ is the magnetic permeability of free space which is a constant 4π × $10^{-7}$ newtons/ampere²

If the magnetic field at the center of the loop is 0, then μ $_{o}$ I = 0

I = 0 which means there will be no current flow in the loop.

3 0

3 years ago

If two proton approach each other with speed of 400m\s and 450m\s respectively what is the total momentum of the two particle sy

lilavasa [31]

Answer: $83.65\times 10^{-27}\ kg.m/s$

Explanation:

Given

The velocities of the protons are 400 m/s and 450 m/s

Mass of the Proton is $m=1.673\times 10^{-27}\ kg$

Since they travel in the opposite direction, therefore, their momentum cancels out each other.

Momentum is the product of mass and velocity

$\therefore m(450-400)\\\Rightarrow 1.673\times 10^{-27}\times 50\\\Rightarrow 83.65\times 10^{-27}\ kg.m/s$

The direction of momentum is in the direction of proton having 450 m/s velocity.

7 0

2 years ago

Question 23 of 32

-BARSIC- [3]

Answer:

2m/s

Explanation:

Given parameters:

Mass of truck = 9000kg

Kinetic energy = 18000J

Unknown:

Speed = ?

Solution:

Kinetic energy is the energy due to the motion of a body;

K.E = $\frac{1}{2}$ mv²

So;

m is the mass

v is the speed

2 KE = mv²

2 x 18000 = 9000 x v²

v² = 4

v = 2m/s

4 0

2 years ago