Please help me!!! SHOW YOUR WORK to get BRAINLIEST
1. )Find the work done by a weightlifter lifting a 20kg barbell 2.2 m upward at a constant
speed.
2.) A 2700 kg car is moving across level ground at 3.5m/s when it begins an acceleration
that ends with the car moving at 12m/s. Is work done in this situation? How do you
know?
3.) An Alaskan huskie pulls a sled using a 700N force across an 8m wide street. The force of
friction on the 82kg sled is 160N. How much work is done by friction? How much work is
done by the huskie? How much by gravity?
4.) A 81kg man climbs a 4.2m tall flight of stairs. What work was done by the man against
the force of gravity?
5.) You are moving 6 books, each weighing 11 N, to a shelf 0.8 m higher. Do you
do more work by moving all 6 books at once, or by moving one book at a time?
6.) If you carry a U S. penny (weighing 0.023 N) to the top of the Empire State
Building (450 m), how much work have you done on the penny?
7.)Ramps for handicapped people to enter buildings are quite common and are usually
long, often having one or more turns. It seems that a shorter, straighter ramp would be
more convenient. Use the concepts of work to explain their design.
8.) The pyramid builders of ancient Egypt used a long ramp (18 m) to raise blocks
by one meter. Each block weighs 150,000 N. How much work is done to raise
one block to a height of one meter?
9.) When pumping up your bicycle tire you exert a force of 40. N to move the
handle down 0.18 m. If you do 200 Nm of work, how many times do you pump
the handle?
10.) How much work is done in holding a 800 N barbell motionless above your head for 40 s?
11.) A student takes a 200 N box from a shelf 1.5 m from the floor, and carries it 35 meters
and places it on another shelf 1.5 m from the floor. How much work against gravity has
she done?