4. A 90 kg man stands in an elevator that has a downward acceleration of 1.4 m/s?. The force exerted by him on the floor is about: A Zero в 90 N 880 N D 760 N 5. A student pushes a loaded sled whose mass m is 100 kg for a distance d of 5 m over a frictionless surface. He exerts a constant horizontal force F of 100 N. If the sled starts from rest, what is its acceleration? 20 m/s? 1 m/s? 100 m/s 5 m/s? A B D 6. A crate whose mass m is 250 kg rests on the bed of a truck that is moving at a speed v, of 100 m/s. The driver applies the brakes and slows to a speed v of 50 m/s in 10 s. What is the acceleration ? +5 m/s? 50 m/s? -5 m/s? 100 m/s? A B D
4. A 90 kg man stands in an elevator that has a downward acceleration of 1.4 m/s?. The force exerted by him on the floor is about: A Zero в 90 N 880 N D 760 N 5. A student pushes a loaded sled whose mass m is 100 kg for a distance d of 5 m over a frictionless surface. He exerts a constant horizontal force F of 100 N. If the sled starts from rest, what is its acceleration? 20 m/s? 1 m/s? 100 m/s 5 m/s? A B D 6. A crate whose mass m is 250 kg rests on the bed of a truck that is moving at a speed v, of 100 m/s. The driver applies the brakes and slows to a speed v of 50 m/s in 10 s. What is the acceleration ? +5 m/s? 50 m/s? -5 m/s? 100 m/s? A B D
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter5: Newton's Laws Of Motion
Section: Chapter Questions
Problem 83PQ: Three crates with masses m1 = 5.45 kg, m2 = 7.88 kg, and m3 = 4.89 kg are in contact on a...
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Transcribed Image Text:4. A 90 kg man stands in an elevator that has a downward acceleration of 1.4
m/s?. The force exerted by him on the floor is about:
A
Zero
в
90 N
880 N
D
760 N
5. A student pushes a loaded sled whose mass m is 100 kg for a distance d of
5 m over a frictionless surface. He exerts a constant horizontal force F of 100 N.
If the sled starts from rest, what is its acceleration?
20 m/s?
1 m/s?
A
B
100 m/s
D
5 m/s?
6. A crate whose mass m is 250 kg rests on the bed of a truck that is moving
at a speed v, of 100 m/s. The driver applies the brakes and slows to a speed v
of 50 m/s in 10 s. What is the acceleration ?
+5 m/s?
50 m/s?
-5 m/s?
100 m/s?
A
B
D
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