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4 years ago

A cannon is fired horizontally at 243 m/s off of a 62 meter tall, shear vertical cliff. How long will it take the

Physics

1 answer:

stellarik [79]4 years ago

4 0

I have your probably older and smarter than me what grade are you in

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Out of solid and liquid, in which object is the effect of gravity more? why?

ollegr [7]

Answer:

Effect of gravity is equal on both solids and liquids.

Explanation:

gravity is independent of the state of matter.

6 0

1 year ago

An object is spun around in circular motion such that its period is 0.2 seconds.

kherson [118]

Answer:

a. 5 Hertz

b. 35 rotations

Explanation:

a. Frequency is given by $f=\frac{1}{T}$ where $T$ is the period, in seconds. Given that $T=0.2$ , the frequency of this object's rotation is:

$f=\frac{1}{T}=\frac{1}{0.2}=\boxed{5\text{ Hz}}$

b. Since one rotation, or period, is completed in 0.2 seconds, divide the amount of time (7 seconds) by the time it takes to complete one revolution (0.2 seconds):

$\frac{7}{0.2}=\boxed{35 \text{ rotations}}$

3 0

2 years ago

a tire rolls from rest to an angular velocity of 6 radians per second. the angle it turns through is 12 radians. what is the ang

True [87]

Answer:

$\alpha =1.5\ rad/s^2$

Explanation:

Given that,

Initial angular velocity, $\omega_i=0$

Final angular speed, $\omega_f=6\ rad/s$

Angular displacement, $\theta=12\ rad$

We need to find the angular acceleration of the tire. We can find it using the third equation of rotational kinematics. So,

$\omega_f^2-\omega_i^2=2\alpha \theta\\\\\alpha =\dfrac{\omega_f^2-\omega_i^2}{2\theta}\\\\\alpha =\dfrac{6^2-0^2}{2\times 12}\\\\\alpha =1.5\ rad/s^2$

So, the angular acceleration of the tire is equal to $1.5\ rad/s^2$ .

7 0

3 years ago

What is a reflection of a wave?

igomit [66]

Answer:

the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

Explanation:

6 0

3 years ago

A 2.40 kg can of coffee moving at 1.50 m/s in the +x-direction on a kitchen counter collides head-on with a 1.20 kg box of macar

liraira [26]

Answer:

The macaroni travels with a velocity of 1.35 m/s in the +x-direction.

Explanation:

By the conservation of momentum principle and assuming there is no external force (e.g. friction) acting on the system, the total initial momentum is equal to the total final momentum.

We take all velocities in the +x-direction as positive.

Initial momentum of coffee can = (2.40 kg)(1.50 m/s) = 3.60 kg m/s

Initial momentum of macaroni = (1.20 kg)(0.00 m/s) = 0.00 kg m/s

Total initial momentum = (3.60 + 0.00) kg m/s = 3.60 kg m/s

Final momentum of coffee can = (2.40 kg)(0.825 m/s) = 1.98 kg m/s

Final momentum of macaroni = (1.20 kg)(v m/s) = 1.20v kg m/s

Total final momentum = (1.98 + 1.20v) kg m/s

Equating both initial and final total momenta,

3.60 kg m/s = (1.98 + 1.20v) kg m/s

1.20v kg m/s = 1.62 kg m/s

v = (1.62 kg m/s) ÷ (1.20 kg) = 1.35 m/s

Since this is positive, the macaroni travels with a velocity of 1.35 m/s in the +x-direction.

6 0

3 years ago