# [Get Answer ]-Midterm

### Question Description

1.A cannonball is fired horizontally with an initial velocity of 655 m/s fromthe end of a cliff 725 m high. How far in the x direction does the cannonball inthe air before it hits the ground?

A)c.5670 m

B)d.9540 m

C)b.4030 m

D)a.8070 m **2.**

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The international space station orbits the Earth at an altitude of about250 km. What is the acceleration due to gravity at that height above the ground?The mass of the Earth is 5.98 x 1024 kg and the radius of the Earthis 6371 km.

A)c.9098710 m/s5

B)b.0 m/s5

C)d.9.10 m/s5

D)a.9.8 m/s5 **3.**

A car uniformly decelerates at a rate of -5.00 m/s2. How fardoes the car travel after 1.50 seconds if it initially was moving at a speed of25.0 m/s?

A)d.28.1 m

B)a.25.0 m

C)b.37.5 m

D)c.31.9 m **4.**

A ball is at the top of a ramp that is 4.5 m above a table. If the ballsrolls without friction, how fast is it going at the bottom of the ramp?

A)a.9.4 m/s

B)c.0.0 m/s

C)b.4.5 m/s

D)d.3.6 m/s **5.**

A 7.93 kg box is pulled along a horizontal surface by a force FPof 84.0 N applied at a 47.0º angle. If the coefficient of kinetic friction is0.35, what is the acceleration of the box?

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**6.**

A 25 kg is acted on by a 45 N horizontal force. If the box accelerates at arate of .75 m/s2, what is the coefficient of kinetic friction betweenthe box and the table?

A)a.0.25

B)c.0.55

C)b.0.11

D)d.1.05 **7.**

Three forces pull on a block, the first is 65 N and in the positive xdirection. The second is 65 N in the negative x direction and the third is 45 Nand is 90 degrees from the first two forces in the positive y direction. Whatcan you say about the resultant force?

A)b.The resultant force is 45 N and in the positive y direction.

B)a.The resultant force is zero.

C)d.The resultant force is 65 N and in the negative y direction.

D)c.The resultant force is 45 N and in the negative y direction. **8.**

A subatomic particle with mass m initially are rest suddenly decays. If oneof the resultant particles with mass 0.40 m of mass leaves with a velocity of5.5 x 105 m/s, what is the velocity of the other particlecreated?

A)c.6.0 x 105 m/s

B)a.3.3 x 105 m/s

C)b.3.7 x 105 m/s

D)d.2.5 x 105 m/s

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